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Interview question bank

Interview questions that test the trade.

My Trade Talent's interview question bank holds 896 technical screening questions for 56 commercial trades roles across 20 trades, three per role, each set with the signals that separate a strong candidate from a plausible one and the hiring mistake that seat invites.

Filter to your trade and role, then send the role to the scorecard builder to print a scorecard both interviewers can use.

56 roles, 896 questions

HVAC & Mechanical

HVAC Service Technician

HVAC & Mechanical

  1. Walk me through diagnosing a rooftop unit that cools fine in the morning and short-cycles by two in the afternoon.

  2. What superheat would you expect on a properly charged R-410A system, and what does it tell you when it reads high?

  3. A tenant says it is too warm and the space is at setpoint. What do you check and in what order?

  4. A rooftop unit trips on high head pressure only on hot afternoons. Where do you start, and what would rule the condenser out?

  5. How do you tell a failed run capacitor from a failing compressor on a call-out, with no parts on the truck?

  6. A customer has had three technicians out for the same intermittent fault. What do you do differently on the fourth visit?

  7. When do you recover and weigh in a charge rather than top it up, and how do you make that call?

  8. Walk me through everything you check before you condemn a compressor.

  9. When do you use subcooling rather than superheat to judge a charge?

  10. A unit is running but not cooling well and the charge checks out. Where do you go next?

  11. Tell me how an economizer is supposed to work, and the three ways you most often find them broken.

  12. Hand me a wiring diagram for a unit you have never seen. How do you use it?

  13. Describe your lockout procedure on a rooftop unit with a disconnect you cannot see from where you are working.

  14. Talk me through recovering refrigerant from a unit you are replacing.

  15. Explain to me, as if I am the building manager and not a technician, why the unit failed.

  16. What stops you from going up on a roof?

Listen for

  • Talks in symptoms and causes rather than part numbers - superheat and subcooling readings, not "I replaced the TXV"
  • Has worked unaccompanied on rooftop equipment, not just assisted on installs
  • Can describe a call they diagnosed wrong and what the second visit found

The mistake

The mistake this seat invites. Hiring on EPA 608 and years of experience without testing diagnostic reasoning. The certification is a floor, not a signal, and residential-heavy experience transfers badly to rooftop and chiller work.

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HVAC Install Technician (Commercial)

HVAC & Mechanical

  1. How do you purge a line set, and what happens downstream if you skip it?

  2. What do you check on a roof curb before the unit lands?

  3. Describe the last VRF system you installed - whose, how many indoor units, and who commissioned it?

  4. How do you support a long refrigerant line set on a roof run, and what fails when it is done badly?

  5. What is your pressure test and evacuation process, and what micron level do you pull to before charging?

  6. The curb does not match the footprint of the new unit. What are your options, and which one do you recommend?

  7. How do you make the duct connection at the curb so service is not chasing leaks next summer?

  8. What do you do differently brazing inside an occupied building versus on new construction?

  9. How do you rig and set a unit with a crane, and what part of the lift plan is yours?

  10. What do you check before you energise a new unit for the first time?

  11. How do you run a line set through an occupied tenant space?

  12. What is your leak check process, and what pressure do you test at?

  13. How do you set hangers and supports so the piping does not transmit vibration into the building?

  14. What documentation do you leave behind on a new install?

  15. Describe your lockout procedure before you open a panel on a live job.

  16. What would make you stop an install and call the project manager?

Listen for

  • Brazing with nitrogen purge described as routine rather than as a best practice they have heard of
  • Has set equipment by crane and can talk about rigging and roof curb fit
  • VRF experience named by manufacturer, because the commissioning differs

The mistake

The mistake this seat invites. Treating install and service as interchangeable. A strong install technician may be a slow diagnostician, and a strong service technician may be uneconomic on a production install crew.

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HVAC Controls Technician (BAS / Niagara)

HVAC & Mechanical

  1. Give me a sequence of operations you found wrong during commissioning, and what you changed.

  2. How do you troubleshoot a BACnet MS/TP trunk where one device drops intermittently?

  3. When would you use a Niagara JACE rather than putting everything on the supervisor?

  4. Walk me through commissioning a VAV box with reheat, and tell me what you would trend afterwards.

  5. The space is comfortable but the air handler runs at full static all day. How do you find out why?

  6. How do you integrate a third-party chiller over BACnet IP when the points list does not match the submittal?

  7. What is the difference between a graphic that looks right and a sequence that is right?

  8. Tell me about a time a trend log told you something the alarm list never would have.

  9. How do you set up a trend so that it answers one specific question?

  10. A point reads correctly at the controller and wrong on the graphic. Walk me through it.

  11. How do you handle a sensor you suspect is out of calibration?

  12. What is your approach to commissioning an economizer sequence?

  13. How do you document a controls change so the next person can follow it?

  14. A building operator has overridden half the points. What do you do?

  15. How do you decide between repairing a sequence and rewriting it?

  16. What is your lockout practice when you are working in a live electrical panel?

Listen for

  • Platform experience named specifically: Niagara, Metasys, Desigo, Distech, Delta. The platforms are not interchangeable
  • Can read a sequence of operations and say where it will fail in practice
  • Has integrated across protocols - BACnet MS/TP, IP, Modbus - rather than staying inside one vendor

The mistake

The mistake this seat invites. Screening this seat as an HVAC role. The scarce skill is integration and programming, and the strongest candidates often come from controls contractors or systems integrators rather than mechanical ones.

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HVAC Service Manager

HVAC & Mechanical

  1. What was your technician utilisation, and what did you do that moved it?

  2. How do you decide which maintenance agreements to let go at renewal?

  3. A technician has a second call-back on the same unit. What happens next in your department?

  4. Two emergency calls land in the middle of a planned maintenance week. How do you rebuild the board?

  5. What do you measure on a technician besides billable hours, and why that?

  6. A callback was plainly the technician’s error. How do you handle it with the customer, and internally?

  7. Walk me through pricing a maintenance agreement on a building you have never serviced.

  8. What is your truck stock policy, and how did you arrive at it?

  9. How do you decide when to add a technician rather than pay overtime?

  10. What does your on-call rotation look like, and how do you keep it fair?

  11. A technician’s callback rate is rising. How do you handle it?

  12. What is your process for quoting work a technician found in the field?

  13. How do you onboard a technician in their first thirty days?

  14. What do you do with an account that is profitable but abusive to your people?

  15. How do you forecast parts and inventory for a season?

  16. How do you train technicians on equipment you have only just taken on?

Listen for

  • Talks about utilisation, call-back rate and agreement renewal rate as numbers they owned
  • Has grown a maintenance agreement base, not just serviced one
  • Came up through the field - departments rarely accept a manager who cannot read a work order

The mistake

The mistake this seat invites. Promoting the best technician into the seat. Field strength does not predict dispatch discipline, and the department loses its best diagnostician in the process.

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HVAC Project Manager (Commercial)

HVAC & Mechanical

  1. Your chiller slipped twelve weeks. Walk me through what you do first.

  2. How do you price and present a change order the general contractor will not want?

  3. At buyout, what do you check before you accept the estimate as your budget?

  4. How do you sequence long-lead equipment against a general contractor schedule that keeps moving?

  5. What does your submittal process look like, and where does it usually go wrong?

  6. How do you track labour against budget during the job rather than after it?

  7. A subcontractor is behind and blaming your equipment delivery. How do you resolve that?

  8. What do you hand the service department at closeout, and why does it matter?

  9. How do you build a schedule of values on a mechanical scope?

  10. The mechanical drawings conflict with structural. What is your process?

  11. A start-up fails on the day the owner is watching. What do you do?

  12. The controls contractor is not ready for your start-up. How do you handle it?

  13. How do you manage retainage and closeout on a mechanical job?

  14. How do you decide whether to self-perform or sub out sheet metal?

  15. What is your approach to a commissioning agent who keeps adding scope?

  16. How do you track and report cost to complete?

Listen for

  • Can state the margin they carried and what moved it, not just project values
  • Long-lead equipment procurement described as a scheduling problem they planned around
  • Change-order discipline - documentation habits described without prompting

The mistake

The mistake this seat invites. Hiring on project size alone. A manager who ran one $20M job may have run one schedule; a manager who ran twelve $2M jobs has run twelve buyouts and twelve closeouts.

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Commercial Construction

Construction Foreman

Commercial Construction

  1. How do you plan tomorrow, and when do you do it?

  2. Material you need on Monday has not arrived. What do you do with the crew?

  3. One of your people is skipping a safety step because it is faster. What happens?

  4. How do you build a three-week look-ahead, and who do you build it with?

  5. A delivery lands today and your crane window is tomorrow. What moves?

  6. How do you hand off between trades so nothing gets torn out and rebuilt?

  7. What does your pre-task plan actually change about how the crew works that day?

  8. Tell me about a layout error you caught before it got buried.

  9. How do you set and verify layout at the start of a floor?

  10. What is your approach to protecting finished work from following trades?

  11. How do you handle a crew member who will not wear required protection?

  12. What do you do when the material delivered is not what was ordered?

  13. How do you plan a lift or a crane pick that involves other trades?

  14. What is your approach to daily reports and why do they matter?

  15. How do you handle an inspection that is scheduled before you are ready?

  16. What makes you stop work on a task?

Listen for

  • Describes planning the next day's work the afternoon before
  • Safety described as something they enforce rather than something that happens to them
  • Can talk about a crew member they coached rather than removed

The mistake

The mistake this seat invites. Assuming the most productive tradesperson becomes the best foreman. The job stops being about personal output on day one.

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Construction Superintendent

Commercial Construction

  1. You are three weeks behind at the halfway point. Walk me through the recovery plan.

  2. How do you run a subcontractor who is under-manning your job for a better one elsewhere?

  3. What does your closeout process look like, and when does it start?

  4. How do you run a weekly coordination meeting that subs actually turn up to?

  5. A sub is behind and says they are waiting on you. How do you establish what is true?

  6. What do you do in your first two weeks on a job you have just inherited?

  7. An inspector fails something you believe is compliant. What happens next?

  8. What does your punch process look like, and when does it start?

  9. How do you build a three-week look-ahead that the subs actually use?

  10. What is your process for a safety incident on your site?

  11. How do you handle a sub who is not manning the job to contract?

  12. What is your approach to weather delays and documenting them?

  13. How do you manage site logistics on a tight urban job?

  14. What do you do when a design conflict stops work in the field?

  15. How do you run turnover and commissioning at the end of a job?

  16. How do you handle an owner representative who directs your crews?

Listen for

  • Talks in sequence and constraint rather than trades and tasks
  • Has run inspections and closeout, not just the productive middle of a job
  • Can describe recovering a slipped schedule with specifics

The mistake

The mistake this seat invites. Hiring a strong foreman into the seat and finding they still run a crew rather than a job. It is the single most common failure in this role.

Print a scorecard for this role Commercial Construction hiring kit Role profile

Construction Project Manager

Commercial Construction

  1. How do you and your superintendent divide the job?

  2. The architect is slow on RFIs and the schedule is suffering. What do you do?

  3. Walk me through how you build and defend a change order.

  4. How do you build a schedule of values that does not put you underwater by month three?

  5. Walk me through your change order process, from field notice to signed.

  6. How do you forecast cost to complete, and how often do you redo it?

  7. The owner wants scope added but no more time. What do you do?

  8. How do you decide to self-perform a scope rather than sub it out?

  9. How do you assemble a buyout plan after award?

  10. What is your approach to a subcontractor default?

  11. How do you handle a design change that affects three trades?

  12. What does your monthly owner report contain?

  13. How do you manage submittals so the long-lead items do not slip?

  14. What is your approach to claims and the documentation that supports them?

  15. How do you decide to accelerate rather than take the delay?

  16. How do you run a closeout so final payment is not held for months?

Listen for

  • Describes the PM-superintendent split clearly, and respects it
  • Change-order and documentation discipline described without prompting
  • Can state budget performance and what moved it

The mistake

The mistake this seat invites. Hiring on project value rather than number of cycles. Buyouts and closeouts are where the skill lives, and they are counted per job.

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Commercial Estimator

Commercial Construction

  1. Two subcontractor quotes are 30% apart. How do you level them?

  2. Which jobs do you recommend not bidding, and on what basis?

  3. Tell me about an estimate that lost money. What did you miss?

  4. Walk me through a takeoff on a design-build job with incomplete drawings.

  5. How do you carry risk in a bid without pricing yourself out of it?

  6. Two subcontractor quotes are 30% apart. What do you do?

  7. Where do your production rates come from, and how do you keep them current?

  8. What do you hand the project manager at turnover, and why that?

  9. How do you handle a bid day where a key sub quote arrives ten minutes before close?

  10. What is your approach to scope gaps between trades?

  11. How do you price general conditions on a long-duration job?

  12. What is your process for a value engineering request?

  13. How do you handle escalation on a job that starts a year after bid?

  14. What do you do when the drawings and specifications contradict each other?

  15. How do you decide whether to bid a job at all?

  16. How do you feed actual costs back into your estimating database?

Listen for

  • Scope levelling described as the core skill rather than takeoff speed
  • Has a view on which jobs to no-bid and why
  • Can describe a job they priced that went badly and what they got wrong

The mistake

The mistake this seat invites. Screening on software fluency. Takeoff tools are learnable in weeks; judgement about scope gaps and subcontractor coverage is not.

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Commercial Electrical

Journeyman Electrician (Commercial)

Commercial Electrical

  1. How do you size a feeder for a 200A three-phase panel, and what in the code drives it?

  2. Walk me through your lockout-tagout sequence on a 480V panel.

  3. What is the difference in how you treat a grounded conductor and an equipment grounding conductor on a sub-panel?

  4. How do you size a feeder, and which code sections are you working from?

  5. A three-phase motor hums but will not start. Walk me through your troubleshooting.

  6. What is your process for proving a circuit dead before you put hands on it?

  7. When do you run MC cable rather than pipe and wire on a commercial fit-out, and who makes that call?

  8. Tell me about a panel schedule you found wrong in the field and what you did about it.

  9. How do you lay out and bend a conduit run so it passes inspection and stays serviceable?

  10. What is your approach to terminating large conductors in a switchgear lineup?

  11. A breaker trips at night and never during the day. How do you chase it?

  12. What do you check before energising a new panel?

  13. The building will not allow a shutdown. How do you handle work near energised equipment?

  14. Walk me through laying out lighting from a reflected ceiling plan.

  15. What is your process for labelling and as-builts?

  16. What would make you refuse to do a piece of work?

Listen for

  • Conduit bending described as routine - offsets, saddles, large-diameter rigid
  • Has worked live-adjacent under NFPA 70E and can describe the boundary rules
  • Commercial and industrial service sizes rather than residential panel swaps

The mistake

The mistake this seat invites. Taking a state licence as proof of commercial capability. Licensing rules vary by state and many journeyman licences are earned on residential hours.

Print a scorecard for this role Commercial Electrical hiring kit Role profile

Master Electrician

Commercial Electrical

  1. Which jurisdictions are you licensed in, and which of those were reciprocity rather than exam?

  2. An inspector red-tags work you believe is compliant. What do you do?

  3. Which code cycle is the jurisdiction we are hiring for on, and what changed that affects us?

  4. A plan review comment is, in your view, incorrect. How do you handle it?

  5. What is your approach to arc flash labelling on an existing building with no study on file?

  6. Walk me through a service upgrade in an occupied building: the sequence, and where the risk sits.

  7. How do you decide a job needs engineered drawings rather than a design-build approach?

  8. What do you look for when you take over a job another contractor started?

  9. How do you commission or interpret a short circuit and coordination study?

  10. What is your approach to grounding and bonding on a service you are responsible for?

  11. How do you handle an apprentice working beyond their competence?

  12. What is your process for a generator and transfer switch installation?

  13. How do you decide a situation requires a shutdown rather than energised work?

  14. The inspector and the engineer disagree. What do you do?

  15. How do you keep your crews current through a code cycle change?

  16. How does your approach to service work differ from project work?

Listen for

  • Names the states and municipalities the licence is active in, and whether by exam or reciprocity
  • Has carried a contractor licence of record, not merely held a master card
  • Inspection relationships described as a working routine rather than an adversarial one

The mistake

The mistake this seat invites. Assuming the licence travels. Reciprocity is specific and partial, and a master in one state may need to sit an exam in the next one.

Print a scorecard for this role Commercial Electrical hiring kit Role profile

Electrical Foreman

Commercial Electrical

  1. How do you plan a floor's rough-in so the mechanical trades do not strand you?

  2. Your crew is three days behind at the end of week two. What do you change?

  3. How do you handle an apprentice who is fast and sloppy?

  4. How do you lay out a floor so two crews are not working on top of each other?

  5. What do you do on Friday afternoon so Monday morning is not wasted?

  6. A journeyman on your crew is fast but sloppy. How do you handle that?

  7. How do you track material on site so it does not walk or get buried?

  8. Describe how you run a daily huddle and what you actually cover.

  9. How do you plan manpower for the next two weeks against the schedule?

  10. The general contractor changes the sequence on you. What now?

  11. How do you run a toolbox talk that people actually listen to?

  12. How do you handle an apprentice who is not progressing?

  13. What is your process for receiving and verifying a gear delivery?

  14. How do you keep layout accurate when several crews are setting it?

  15. You find work installed wrong by your own crew. What happens?

  16. How do you close out a floor so the punch list is short?

Listen for

  • Talks about production rates and manpower loading, not just tasks completed
  • Coordination described from the other trades' side - ductwork and sprinkler mains win ceiling space arguments
  • Has run a crew through an inspection and a punch list

The mistake

The mistake this seat invites. Promoting on technical skill without testing whether the person will hold other people to a standard. The quietest strong journeyman is not automatically a foreman.

Print a scorecard for this role Commercial Electrical hiring kit Role profile

Commercial Electrical PM

Commercial Electrical

  1. Gear is quoted at 40 weeks. How does that change your buyout and your schedule?

  2. How do you build a manpower curve, and who do you build it with?

  3. Describe a change order that was denied. What did you do next?

  4. How do you price and defend a change order for circuits added after rough-in?

  5. What does your buyout look like on gear with a long lead time?

  6. At the halfway point, how do you forecast labour to complete?

  7. What makes a good RFI, and how many is too many?

  8. How do you close a job out so retainage is released without a fight?

  9. How do you build and maintain a submittal log?

  10. Gear delivery slips past the energisation date. What do you do?

  11. How do you handle a field directive with no price agreed?

  12. What is in your weekly cost report, and who actually reads it?

  13. The owner keeps making changes verbally. How do you manage that?

  14. What is your process for temporary power on a site?

  15. How do you assess liquidated damages exposure before signing?

  16. How do you hand a job from preconstruction to the field?

Listen for

  • Switchgear and transformer lead times discussed as a planning input, not a surprise
  • Can describe how they forecast manpower with the foreman rather than at them
  • Billing and retainage described in detail - cash position is part of the job

The mistake

The mistake this seat invites. Hiring a strong foreman into the seat and expecting the commercial instincts to follow. The two jobs share a vocabulary and almost nothing else.

Print a scorecard for this role Commercial Electrical hiring kit Role profile

Commercial Plumbing

Journeyman Plumber (Commercial)

Commercial Plumbing

  1. How do you size a vent for a battery of fixtures, and what goes wrong if you undersize it?

  2. When would you use press fittings on a commercial domestic water line, and when would you not?

  3. Walk me through testing a sanitary system before the walls close.

  4. How do you size a storm drain, and what code are you working from?

  5. Walk me through testing a DWV system, and tell me what a failed test usually turns out to be.

  6. Pressing versus soldering copper on a commercial job: how do you decide?

  7. How do you tie into an existing main in an occupied building?

  8. Describe a backflow installation and what the inspector is going to look at.

  9. How do you rough in a bathroom group from the drawings, and what do you set first?

  10. What is your approach to supporting cast iron on a riser?

  11. How do you cut into a live sanitary line without flooding the floor below?

  12. What do you check before you close a wall?

  13. How do you handle a water hammer complaint on a finished building?

  14. What is your process for sizing and installing a water heater and its venting?

  15. How do you protect piping from freezing in an unconditioned space?

  16. What would make you stop and call your foreman?

Listen for

  • Pipe materials and joining methods described by application rather than preference
  • Has worked to a riser diagram and coordinated sleeves and penetrations before the pour
  • Medical gas or backflow certification where the work calls for it

The mistake

The mistake this seat invites. Hiring residential service plumbers for commercial construction. The diagnostic skill is real but the coordination and layout demands are a different job.

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Master Plumber

Commercial Plumbing

  1. Which jurisdictions are you licensed in, and which were reciprocity?

  2. Which plumbing code is in force where we work, and what changed in the last cycle that affects commercial jobs?

  3. Describe a time you told a project manager a design would not pass. What happened?

  4. How do you approach a plan review comment on fixture count?

  5. What changes in your process when a job carries medical gas or lab waste?

  6. Cast iron or PVC on a commercial riser, beyond code minimum. How do you decide?

  7. Walk me through permitting a job in a jurisdiction you have not worked in before.

  8. What do you check before you sign off another plumber’s work?

  9. How do you approach a grease interceptor sizing question with the health department?

  10. What is your process for a backflow assembly that fails its annual test?

  11. How do you handle a code official interpreting a section differently from you?

  12. What is your approach to a building with recurring hot water complaints?

  13. How do you decide when a repipe is cheaper than continued repairs?

  14. What do you check on another contractor’s rough-in before you take it over?

  15. How do you keep apprentices productive without putting them beyond their skill?

  16. What is your approach to a job that needs a licensed medical gas installer?

Listen for

  • States which jurisdictions the licence covers and how it was obtained
  • Has been the licence of record for a contractor, with the exposure that carries
  • Can talk through a plan review conversation with an AHJ

The mistake

The mistake this seat invites. Treating the master licence as a seniority marker rather than a liability position. The person whose licence permits the work needs the authority to stop it.

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Commercial Plumbing PM

Commercial Plumbing

  1. Owner-furnished fixtures are eight weeks late. What do you do about the schedule and the contract?

  2. How do you run coordination with the mechanical contractor on a tight ceiling?

  3. What do you verify at buyout before accepting the estimator's numbers?

  4. How do you coordinate underground against the concrete schedule?

  5. What does your fixture submittal and approval process look like?

  6. The architect changes a fixture spec after the order is placed. What now?

  7. How do you track productivity on a repetitive high-rise job?

  8. What is in a good closeout package for a plumbing scope?

  9. How do you sequence a high-rise riser installation?

  10. What is your approach to a fixture that is discontinued after approval?

  11. How do you coordinate sleeves and penetrations with the concrete pour schedule?

  12. What does your change order process look like from field notice to signed?

  13. How do you manage a job where the general contractor is behind and you are ready?

  14. What is your approach to testing and inspection scheduling?

  15. How do you forecast labour to complete on a repetitive job?

  16. What is in a closeout package the owner will actually accept?

Listen for

  • Fixture schedules and owner-furnished equipment described as a tracked risk
  • Coordination with mechanical described in terms of sequence and space, not goodwill
  • Can state the margin carried and what moved it

The mistake

The mistake this seat invites. Underweighting procurement. On commercial plumbing the schedule is usually lost in the submittal and fixture cycle rather than in the field.

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Commercial Roofing

Commercial Roofing Foreman

Commercial Roofing

  1. Tear-off is open and a storm is two hours out. What is your sequence?

  2. Walk me through flashing a curb-mounted unit on a TPO roof.

  3. The deck under the old system is worse than the bid assumed. Who do you call and in what order?

  4. How do you plan a tear-off so the building is dry every night?

  5. What is your approach to roof loading and staging material?

  6. Describe your detail at a curb penetration on a TPO roof.

  7. Weather turns at midday. Walk me through your sequence.

  8. How do you keep a crew safe at the edge without slowing them down?

  9. How do you set up a safe perimeter on a low-slope roof with no parapet?

  10. What is your approach to a deck you find deteriorated after tear-off?

  11. How do you handle hot work and the fire watch that goes with it?

  12. What is your process for staging material without overloading the deck?

  13. How do you protect the building interior during the work?

  14. What is your approach to flashing at a wall termination?

  15. How do you handle a crew working in heat?

  16. What do you check before you call a section complete?

Listen for

  • Names the systems worked rather than saying "commercial roofing" - TPO, EPDM, modified bitumen, built-up, standing seam
  • Treats detail work - curbs, penetrations, parapets, drains - as the part that decides whether the roof leaks
  • Can describe a dry-in plan for a partial tear-off with rain forecast

The mistake

The mistake this seat invites. Hiring on square footage installed rather than on detail work and dry-in judgement. Roofs fail at penetrations and terminations, not in the field of the membrane.

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Commercial Roofing PM

Commercial Roofing

  1. What does a manufacturer need from you before they will issue an NDL warranty?

  2. Three roofs, two crews, and a week of rain. How do you re-sequence?

  3. How do you price and document unforeseen deck replacement?

  4. How do you price a reroof when you cannot see the existing deck?

  5. What does your warranty submission look like with the manufacturer?

  6. A roof you installed two years ago is leaking. What is your first move?

  7. How do you sequence a phased reroof over an occupied building?

  8. What do you check in an inspection report before you quote off it?

  9. How do you scope a reroof from a site visit rather than drawings?

  10. What is your approach to a manufacturer inspection that fails?

  11. How do you handle an owner who wants a warranty you cannot get on that assembly?

  12. What is your process for a roof asset management or survey programme?

  13. How do you price and sequence work around tenant operations?

  14. What is your approach to a leak that appears during construction?

  15. How do you manage material escalation on a roofing contract?

  16. What do you hand over at closeout?

Listen for

  • Understands that the manufacturer warranty is a document trail, not a handshake
  • Has scheduled around weather and material lead times as a normal constraint rather than an excuse
  • Can describe pricing a deck-condition change order that was found after tear-off

The mistake

The mistake this seat invites. Treating the role as general construction project management. Roofing is warranty-driven and weather-driven in ways other trades are not.

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Commercial Roofing Service Technician

Commercial Roofing

  1. A tenant reports a ceiling stain twenty feet from the nearest penetration. How do you find the source?

  2. How do you repair a TPO seam failure so the warranty survives it?

  3. What goes in a preventive maintenance report that makes an owner approve the repair?

  4. You are on a roof with an active leak and no drawings. How do you find the source?

  5. How do you repair a seam on an aged TPO so that it actually holds?

  6. What do you document on a service call so the next person is not starting over?

  7. When do you tell a customer a repair is not worth doing?

  8. The customer thinks ponding water is a leak. How do you handle that conversation?

  9. How do you perform a water test to confirm a leak source?

  10. What is your approach to a roof with multiple previous repairs?

  11. How do you repair a flashing detail at a curb properly rather than temporarily?

  12. What do you carry on the truck for an emergency call?

  13. How do you handle a roof that is unsafe to walk?

  14. What is your approach to documenting a roof condition for the customer?

  15. How do you decide between a repair and recommending replacement?

  16. What do you do when the leak is not coming from the roof?

Listen for

  • Describes leak tracing as a diagnostic process rather than patching the nearest suspect spot
  • Comfortable writing the condition report the owner actually reads
  • Has worked across several membrane types, because service work does not get to choose

The mistake

The mistake this seat invites. Screening for installation experience. Service technicians diagnose and write; installers produce. The overlap is smaller than it looks.

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Fire Protection

Fire Alarm Technician

Fire Protection

  1. Walk me through an NFPA 72 acceptance test on a new addressable system.

  2. A device keeps reporting a ground fault intermittently. How do you isolate it?

  3. How do you handle the elevator recall interface on a retrofit?

  4. Walk me through a full device test on an addressable system, and what you record.

  5. A device drops into trouble intermittently. How do you chase it?

  6. How do you manage an impairment while you are working on a live system?

  7. What is your process for programming and verifying a new device on a loop?

  8. What do you check before an AHJ acceptance test so it passes the first time?

  9. How do you perform a sensitivity test and what do you do with the results?

  10. What is your approach to a panel with a history of nuisance alarms?

  11. How do you coordinate a test with the monitoring company and the AHJ?

  12. What is your process for battery calculations and standby capacity?

  13. How do you handle a system from a manufacturer you have not worked with?

  14. What do you check on notification appliance circuits for coverage and voltage drop?

  15. How do you document a system so the next inspection is straightforward?

  16. What would make you declare a system out of service?

Listen for

  • NICET level stated, and the candidate knows what it did and did not qualify them for
  • Names specific panel platforms programmed rather than listing manufacturers seen
  • Has run an acceptance test with an AHJ present and can describe how it went wrong once

The mistake

The mistake this seat invites. Treating this as low-voltage electrical work. The code knowledge and the AHJ relationship are the job; pulling the cable is the easy part.

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Fire Sprinkler Fitter

Fire Protection

  1. What changes when you install a dry system in an unheated warehouse rather than a wet system?

  2. The drawing puts a head where a duct now runs. What do you do?

  3. Walk me through a 200 psi hydrostatic test and what you watch for.

  4. How do you lay out a branch line against ceiling grid and light fixtures?

  5. Walk me through a hydrostatic test, and what you do when it fails.

  6. What changes between a wet and a dry system in how you install it?

  7. How do you tie into a live system in an occupied building?

  8. What will an inspector look at on your hangers and bracing?

  9. How do you handle a head that lands in the wrong place relative to the ceiling grid?

  10. What is your approach to seismic bracing and where does it usually get missed?

  11. How do you drain and refill a system in an occupied building?

  12. What is your process for an antifreeze or dry system in a cold space?

  13. How do you handle corrosion you find inside existing pipe?

  14. What do you check on a fire pump during an annual test?

  15. How do you protect finished ceilings while you work above them?

  16. What would stop you from putting a system back in service?

Listen for

  • Can read a sprinkler shop drawing and spot where it will not fit the ceiling that is actually there
  • Knows why a dry system behaves differently from a wet one in both installation and trouble calls
  • Has done hydrostatic testing and can describe a failed test and the fix

The mistake

The mistake this seat invites. Screening on pipefitting experience alone. The pipe skills transfer; the code, the head spacing rules and the testing discipline do not come with them.

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Fire Alarm / Sprinkler Designer

Fire Protection

  1. How do you choose the remote area for a hydraulic calculation?

  2. An AHJ rejects your head spacing in a sloped-ceiling area. What is the likely reason?

  3. How do you coordinate sprinkler mains against mechanical in a tight plenum?

  4. How do you run a hydraulic calculation, and what do you do when it does not pass?

  5. The reflected ceiling plan conflicts with your head layout. What is your process?

  6. How do you decide between a wet, dry or pre-action system?

  7. Walk me through a plan submittal to an AHJ you have not dealt with before.

  8. What coordination do you do with mechanical and electrical before you issue?

  9. How do you handle a storage occupancy where the commodity classification is unclear?

  10. What is your approach to designing for a ceiling obstruction you cannot move?

  11. How do you coordinate your design with ductwork and lighting before issue?

  12. What is your process when the available water supply will not support the design?

  13. How do you document assumptions so the installer does not have to guess?

  14. What is your approach to a retrofit where no record drawings exist?

  15. How do you handle a value engineering request that reduces protection?

  16. What do you do when the AHJ requires something the standard does not?

Listen for

  • Hydraulic calculation described as judgement about the remote area, not as software output
  • Has had designs rejected by an AHJ and can say why and what changed
  • Coordinates with ductwork and structure before issuing, not after

The mistake

The mistake this seat invites. Hiring on CAD or HydraCAD fluency. The software is learnable; knowing which calculation to run and which AHJ will question it is not.

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Paving & Asphalt

Asphalt / Paving Operator

Paving & Asphalt

  1. The mat is tearing behind the screed. What are you checking first?

  2. How does your rolling pattern change on a cold night versus a hot afternoon?

  3. When do you stop paving rather than place a load you are unsure about?

  4. How do you set a paver up for a mat that will hold tolerance?

  5. What causes segregation in a mat, and how do you prevent it?

  6. How do you handle the joint between yesterday and today?

  7. What are you watching on the truck exchange to keep the mat consistent?

  8. The mix shows up colder than it should be. What do you change?

  9. How do you set up for a tight radius or an irregular shape?

  10. What is your approach to paving against a curb or gutter line?

  11. How do you handle a subgrade that is pumping under the trucks?

  12. What do you do when the mat shows roller marks that will not roll out?

  13. How do you manage paving in cool or marginal weather?

  14. What is your approach to a longitudinal joint that has to hold up?

  15. How do you keep the screed clean and the mix from building up?

  16. What makes you stop paving for the day?

Listen for

  • Names the specific machines run and the mix types placed, not "paving equipment"
  • Describes rolling pattern and mat temperature as linked decisions
  • Has run night work and understands what cooling time does to the pattern

The mistake

The mistake this seat invites. Hiring on hours in a seat. The operators worth having are the ones who read the mat and speak up; that is not on a resume.

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Paving Foreman

Paving & Asphalt

  1. Trucks are arriving fifteen minutes apart on a job that needs continuous paving. What do you do?

  2. How do you build and compact a longitudinal joint?

  3. Density came back short on a lot. How do you find out why?

  4. How do you plan a parking lot so traffic keeps moving and the work stays sequenced?

  5. What do you check on grade and base before a single truck arrives?

  6. Rain is forecast for two o’clock. What do you change at seven?

  7. How do you manage density testing, and what do you do with a failed core?

  8. How do you keep the roller pattern honest across a whole shift?

  9. How do you set up traffic control on a live commercial lot?

  10. What is your approach to milling depth and what tells you to change it?

  11. How do you handle utilities and structures in the paving area?

  12. What is your process for tack coat and why does it get skipped?

  13. How do you plan truck cycles so the paver never stops?

  14. What do you do when the mix arriving does not match the ticket?

  15. How do you handle a customer who wants to drive on it immediately?

  16. What is your approach to striping and the handoff that goes with it?

Listen for

  • Treats truck sequencing and plant coordination as part of quality, not logistics
  • Can describe building a longitudinal joint that will not ravel
  • Has owned density and smoothness results, including a failing one

The mistake

The mistake this seat invites. Promoting the best operator. Running the crew is a scheduling and coordination job, and the two skills do not always live in the same person.

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Screed Operator

Paving & Asphalt

  1. What causes a repeating ripple in the mat and how do you stop it?

  2. When would you run a 30-foot ski rather than a shorter reference?

  3. Your head of material keeps swinging. What is happening upstream?

  4. How do you set and hold a crown, and what tells you it is drifting?

  5. What are you reading off the mat coming out behind the screed?

  6. How do you handle a transition into an existing surface?

  7. The mat tears. What causes that, and what do you do?

  8. How do you set up for a tight radius or an area that has to be hand-worked?

  9. How do you read and correct a mat that is showing a wave?

  10. What is your approach to matching an existing grade at a tie-in?

  11. How do you set up for variable depth across a lot?

  12. What do you do when the auger is starving on one side?

  13. How do you handle a hand-work area so it does not look patched?

  14. What is your approach to a joint at a manhole or catch basin?

  15. How do you work with the roller operator across a shift?

  16. What tells you the mat is going down right without a core?

Listen for

  • Understands head of material as the primary variable rather than screed adjustment
  • Has used stringline, ski and averaging beam references and knows when each applies
  • Can describe chasing and fixing a recurring bump without over-correcting

The mistake

The mistake this seat invites. Treating this as an entry rung behind the paver operator. Smoothness incentives and penalties land on this seat, and experienced screed hands are the scarcest part of a paving crew.

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Commercial Landscaping

Landscape Crew Lead

Commercial Landscaping

  1. A property manager says the site looks worse than last month. How do you find out what changed?

  2. How do you adjust the route when you are a crew member short?

  3. Walk me through your spring prune on a commercial frontage.

  4. How do you route a crew through a property so you are not doubling back?

  5. What do you check on equipment before the trailer leaves the yard?

  6. A client complains about scalping. What happened, and what do you change?

  7. How do you handle a crew member who is quick but damaging property?

  8. What does a good quality check look like before you leave a site?

  9. How do you decide mowing height and frequency across a season?

  10. What is your approach to a turf area that is thinning in one spot?

  11. How do you handle irrigation you find running during your visit?

  12. What is your process for storm clean-up on a commercial property?

  13. How do you train a new crew member on equipment safely?

  14. What is your approach to pruning a shrub bed that has been neglected?

  15. How do you handle a property where parking makes access difficult?

  16. What do you report back to the office after a visit?

Listen for

  • Describes the route as a quality problem rather than a time problem
  • Can identify common plant material and its failure modes in their region
  • Bilingual crew leadership where the crew needs it, stated plainly

The mistake

The mistake this seat invites. Hiring on equipment experience. Crew leads are judged on what the property looks like, which depends on horticultural judgement and crew management more than on mower hours.

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Landscape Foreman

Commercial Landscaping

  1. The plan calls for a tree where there is now a utility. What happens next?

  2. How do you prepare a bed that has been compacted by construction traffic?

  3. Walk me through your punch walk and what you fix before the owner arrives.

  4. How do you build a route that holds up when one crew runs long?

  5. What do you do when a property has been losing turf quality for a month?

  6. How do you handle an irrigation fault you find mid-visit on a mowing route?

  7. What does your equipment maintenance schedule look like, and who owns it?

  8. How do you train a new crew member in their first week without losing the route?

  9. How do you plan a spring or fall clean-up across multiple properties?

  10. What is your approach to a snow event and the call you have to make at four in the morning?

  11. How do you manage chemical application and the records that go with it?

  12. What do you do when a crew damages irrigation or hardscape?

  13. How do you balance route efficiency against quality complaints?

  14. What is your approach to seasonal hiring and training?

  15. How do you handle equipment breakdown mid-route?

  16. What makes you pull a crew off a property?

Listen for

  • Reads a landscape plan and can price the gap between it and the site conditions
  • Treats drainage and soil preparation as the part that decides whether the plants survive
  • Has run installation under a general contractor schedule, not just maintenance

The mistake

The mistake this seat invites. Hiring maintenance experience for installation work or the reverse. Both are landscaping; the plan reading, grading and schedule pressure of installation are a different job.

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Landscape Account Manager

Commercial Landscaping

  1. Walk me through a renewal conversation with a property manager who thinks the price is too high.

  2. How do you find enhancement work on a site that already looks acceptable?

  3. A crew has damaged a client plant. What do you do in the first hour?

  4. A client wants a credit for a missed visit. How do you handle it?

  5. How do you walk a property with a client and come away with work rather than a complaint list?

  6. What do you do with an account that is profitable but miserable to service?

  7. How do you price an enhancement so it gets approved and still makes money?

  8. What does your renewal conversation look like, and when does it start?

  9. How do you build a renewal proposal that reflects actual cost?

  10. What is your approach to a property whose scope has quietly grown?

  11. How do you handle a client comparing your price to a lowball bid?

  12. What is your process for a site walk with a property manager?

  13. How do you sell enhancements without becoming a nuisance?

  14. What do you do when your own crews are the reason for the complaint?

  15. How do you forecast a book of business for the year?

  16. What is your approach to an account you think should be resigned?

Listen for

  • Can state renewal retention on their book and what drove the losses
  • Sells enhancements by walking the property rather than by sending a list
  • Knows the horticulture well enough to be believed by the crews and the client

The mistake

The mistake this seat invites. Hiring a salesperson without the horticulture. Property managers notice quickly when the account manager cannot answer a question about their own site.

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Landscape Project Manager

Commercial Landscaping

  1. The specified tree size is unavailable in the region. How do you handle the substitution?

  2. How do you protect your installation when you are the last trade on a congested site?

  3. What does your warranty walk look like and when do you schedule it?

  4. How do you sequence an install against a general contractor who is not ready for you?

  5. What do you check on plant material at delivery, and what do you reject?

  6. How do you handle a soil or drainage problem that was not in the scope?

  7. What is your approach to a maintenance period after an install?

  8. How do you track labour on an install that is going sideways?

  9. How do you handle plant material that arrives in poor condition?

  10. What is your approach to grading and drainage on an install?

  11. How do you coordinate irrigation with the landscape installation?

  12. What is your process for plant establishment and the warranty period?

  13. How do you manage a landscape architect who is making field changes?

  14. What is your approach to soil testing and amendment?

  15. How do you handle an install scheduled in the wrong season?

  16. What do you hand over to the maintenance team?

Listen for

  • Has sourced plant material against a specification and managed substitutions
  • Understands establishment and warranty obligations as a cost to be scheduled
  • Can work to a general contractor schedule that treats landscape as the last trade in

The mistake

The mistake this seat invites. Underestimating the establishment period. The job is not finished at installation, and project managers who schedule it that way lose the warranty argument.

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Commercial Painting

Commercial Painter

Commercial Painting

  1. How do you prep and prime new drywall versus previously painted CMU?

  2. You are spraying in an occupied corridor overnight. What is your containment plan?

  3. What causes flashing on a repaint and how do you prevent it?

  4. How do you prep a previously coated wall that is failing in patches?

  5. What is your approach to colour changes and coverage on a tight schedule?

  6. How do you protect finished surfaces when other trades are still working?

  7. What do you do when the spec calls for a product you think is wrong for the substrate?

  8. How do you decide spray, roll or brush on a given area?

  9. How do you handle drywall that has been poorly finished by someone else?

  10. What is your approach to colour matching an existing wall?

  11. How do you plan painting around an occupied floor?

  12. What is your process for masking and protection on a finished space?

  13. How do you handle a ceiling that has water staining?

  14. What is your approach to touch-up at the end of a job?

  15. How do you manage ventilation and odour in an occupied building?

  16. What do you do when the paint is not covering in the specified number of coats?

Listen for

  • Talks about preparation and masking time as the majority of the job
  • Spray experience stated with the equipment and the coatings, not just "sprayer"
  • Has worked occupied buildings and understands containment and odour control

The mistake

The mistake this seat invites. Screening on speed. Callbacks on commercial painting come from preparation and from damage to adjacent work, both of which look like slowness on day one.

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Industrial Painter / Coatings

Commercial Painting

  1. What is the difference between SSPC-SP6 and SP10, and when does the spec call for each?

  2. How do you verify a three-coat system was applied to the specified thickness?

  3. Describe a coating failure you have seen and what caused it.

  4. Walk me through surface prep to an SSPC standard and how you verify it.

  5. How do you measure and record dry film thickness, and what do you do when it is low?

  6. What changes in your process when you are coating in a containment?

  7. How do you handle coating in conditions near the dew point?

  8. What do you look for in a holiday test, and what happens when you find one?

  9. How do you prepare and coat a structure that cannot be taken out of service?

  10. What is your approach to a coating failure you are called in to assess?

  11. How do you manage waste and containment on an abrasive blast?

  12. What is your process for an inspection hold point with a third-party inspector?

  13. How do you handle a tank interior and the entry permit that goes with it?

  14. What is your approach to stripe coats and why do they matter?

  15. How do you deal with flash rust between prep and coating?

  16. What would make you stop and not apply a coating that day?

Listen for

  • Knows SSPC surface preparation standards by number and what each one actually produces
  • Measures wet and dry film thickness as a matter of course
  • Has worked under containment with the respiratory and confined-space training to match

The mistake

The mistake this seat invites. Treating industrial coatings as painting with better pay. The inspection regime, the safety requirements and the failure consequences are different work.

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Commercial Painting Foreman

Commercial Painting

  1. The general contractor compresses your schedule by two weeks. What changes?

  2. How do you protect finished walls when flooring and casework follow you?

  3. How do you work a punch list of three hundred items across four floors?

  4. How do you phase a building so you are not blocking other trades?

  5. What does your daily production target look like, and how do you track it?

  6. How do you handle a crew member whose cut lines are not acceptable?

  7. What is your process for punch and touch-up so it does not run forever?

  8. How do you manage material on a job with multiple colours and sheens?

  9. How do you estimate labour for a floor so the crew is not idle?

  10. What is your approach to a schedule where finishes are being rushed?

  11. How do you handle spray in a space with other trades present?

  12. What is your process for colour approval and mock-ups?

  13. How do you manage waste, disposal and site cleanliness?

  14. How do you handle a crew member damaging adjacent finishes?

  15. What is your approach to a punch list that keeps growing?

  16. How do you track production against the estimate during the job?

Listen for

  • Schedules painting around the trades that will damage it, rather than after them
  • Can describe manpower loading on a job that compressed
  • Owns the punch list without treating it as someone else's fault

The mistake

The mistake this seat invites. Promoting the best painter. The foreman job is sequencing against other trades and defending finished work, which is coordination rather than craft.

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Commercial Flooring

Commercial Carpet Installer

Commercial Flooring

  1. How do you test a slab for moisture and what reading stops the installation?

  2. How do you lay out seams in a corridor with windows down one side?

  3. What goes wrong with quarter-turn carpet tile installation and how do you avoid it?

  4. How do you check a slab before you lay anything, and what stops the job?

  5. What is your seam plan on a large open floor, and why there?

  6. How do you handle a transition to an existing floor at a different height?

  7. What do you do when the pattern does not line up with the room?

  8. How do you handle broadloom in a corridor with doors and frames in the way?

  9. How do you handle a subfloor with old adhesive residue?

  10. What is your approach to carpet tile layout and dye lots?

  11. How do you deal with a doorway transition into a different material?

  12. What is your process for stretching broadloom so it does not ripple?

  13. How do you handle a room that is out of square?

  14. What is your approach to working around furniture in an occupied office?

  15. How do you deal with a seam that will fall in a high-traffic path?

  16. What do you check before you call the installation complete?

Listen for

  • Tests and documents subfloor moisture rather than assuming the slab is ready
  • Plans seams against the light and the traffic pattern, not just the roll width
  • Has installed carpet tile in occupied space in phases

The mistake

The mistake this seat invites. Hiring on square footage installed and skipping the subfloor questions. The moisture test is the part that decides whether the job comes back.

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LVT / Hard Surface Installer

Commercial Flooring

  1. The slab is out of flat by a quarter inch over ten feet. What do you do before you install?

  2. How do you choose between a pressure-sensitive and a hard-set adhesive?

  3. Walk me through heat-welding a sheet vinyl seam in a patient room.

  4. What moisture testing do you do, and at what point do you refuse to install?

  5. How do you handle a slab that is out of flatness tolerance?

  6. What is your approach to acclimation, and what happens when it is skipped?

  7. How do you plan the layout so you are not finishing on a sliver?

  8. What causes telegraphing, and how do you prevent it?

  9. How do you prepare a slab that has a curing compound on it?

  10. What is your approach to pattern direction and layout in a long corridor?

  11. How do you handle expansion and movement joints?

  12. What is your process when the adhesive open time does not match conditions?

  13. How do you deal with a subfloor crack that will telegraph?

  14. What is your approach to a transition at an elevator threshold?

  15. How do you handle material from two different production runs?

  16. What do you do when the moisture test comes back marginal rather than clearly failing?

Listen for

  • Treats substrate flatness as the controlling variable, because LVT telegraphs everything under it
  • Knows which adhesive goes with which product and moisture condition
  • Has heat-welded sheet vinyl seams in healthcare or similar environments

The mistake

The mistake this seat invites. Assuming carpet installers convert directly. Resilient work is less forgiving of the substrate and the adhesive choice, and the failures are visible.

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Polished Concrete Installer

Commercial Flooring

  1. The owner wants Class C aggregate exposure on a slab that was finished hard. What do you tell them?

  2. Walk me through your grit sequence to an 800 finish.

  3. When do you apply densifier and what goes wrong if you apply it too early?

  4. How do you decide the grind sequence on a slab you have not seen before?

  5. What do you do when you expose aggregate unevenly across a pour?

  6. How do you handle existing adhesive or coating on the slab?

  7. What is your densifier process, and how do you know it worked?

  8. How do you manage dust and noise in an occupied building?

  9. How do you handle a slab with significant variation in hardness?

  10. What is your approach to joint filling and when do you do it?

  11. How do you deal with a customer expecting a mirror finish on an unsuitable slab?

  12. What is your process for stain or dye application?

  13. How do you protect the finished floor from following trades?

  14. What is your approach to a repair in a polished area that must blend?

  15. How do you manage slurry containment and disposal?

  16. What do you tell a customer about maintenance before you leave?

Listen for

  • Speaks in grit sequence and exposure class rather than "polished"
  • Assesses the slab before committing to a finish level
  • Understands densifier timing and what happens when it is rushed

The mistake

The mistake this seat invites. Selling or hiring against a photograph. The finish achievable depends on the existing slab, and the expectation conversation is part of the skill.

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Commercial Flooring PM

Commercial Flooring

  1. Moisture testing comes back high two days before installation. What happens?

  2. How do you phase a floor replacement in an occupied office?

  3. A dye lot shortage leaves you short on a corridor. What are your options?

  4. How do you sequence flooring against the paint and casework schedule?

  5. What is your process when the slab fails moisture testing after the material is ordered?

  6. How do you handle attic stock and overage on a multi-phase job?

  7. What do you do when the owner changes a product selection mid-job?

  8. How do you measure productivity on a repetitive floor?

  9. How do you handle a material lead time that will not meet the schedule?

  10. What is your approach to a mock-up that the owner rejects?

  11. How do you coordinate moisture mitigation with the general contractor?

  12. What is your process for phasing an occupied building?

  13. How do you manage attic stock and the owner handover?

  14. What is your approach to a claim about an installation defect?

  15. How do you price a job with multiple small rooms rather than open floor?

  16. How do you forecast labour on a job already behind?

Listen for

  • Manages dye lot and lead time as a scheduling constraint from the start
  • Has made the moisture mitigation call and can explain who paid for it
  • Phases occupied-building work around the tenant, not around the crew

The mistake

The mistake this seat invites. Treating flooring as a commodity buy. The moisture decision and the phasing plan are where the margin and the disputes live.

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Commercial Cleaning & Facilities

Janitor / Custodial Technician

Commercial Cleaning & Facilities

  1. What dwell time does your disinfectant need and what happens if you wipe it early?

  2. Walk me through stripping and refinishing a VCT corridor overnight.

  3. How do you clean a restroom so it stays acceptable for eight hours, not one?

  4. How do you work a floor plan so you are not backtracking?

  5. What is your process for restrooms, and in what order?

  6. How do you handle a spill or incident that is outside your normal scope?

  7. What do you do when you find something that should be reported?

  8. How do you work in an occupied office without disrupting people?

  9. How do you handle a biohazard or bodily fluid clean-up?

  10. What is your approach to floor care on a schedule rather than on demand?

  11. How do you deal with a locked area you are supposed to service?

  12. What is your process for chemical dilution and labelling?

  13. How do you handle a complaint from an occupant directly?

  14. What is your approach to a building with inconsistent waste separation?

  15. How do you work safely alone at night?

  16. What do you do when you cannot complete the full scope in the time available?

Listen for

  • Knows the difference between cleaning, sanitising and disinfecting, and when each is required
  • Has worked to a documented protocol - healthcare, food plant, or similar - not just a checklist
  • Floor care experience stated specifically: stripping, refinishing, burnishing, extraction

The mistake

The mistake this seat invites. Treating the seat as unskilled and hiring purely on availability. Turnover costs more than the wage difference, and protocol-trained cleaners are a different labour market.

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Cleaning Supervisor

Commercial Cleaning & Facilities

  1. Two people no-show on a four-person building. What do you do?

  2. How do you inspect a site and what do you do with the result?

  3. A client complains about restrooms every Monday. How do you diagnose it?

  4. How do you inspect a building so the score means something?

  5. A client complains about the same thing twice. What changes?

  6. How do you cover a call-off at six in the evening?

  7. What does your onboarding look like for a new cleaner on a live account?

  8. How do you manage supply cost without the quality dropping?

  9. How do you build a cleaning schedule for a building you are taking over?

  10. What is your approach to periodic work like stripping and waxing?

  11. How do you handle a client requesting work outside the contract?

  12. What is your process for training on chemical safety?

  13. How do you manage keys, access and security on your accounts?

  14. What is your approach to staffing a building that has just doubled in occupancy?

  15. How do you handle theft or damage allegations against your staff?

  16. How do you measure quality in a way the client accepts?

Listen for

  • Can state how they cover a call-out at nine at night without the client noticing
  • Inspects against a written standard and keeps the record
  • Has managed supply and equipment budgets, which is where the margin leaks

The mistake

The mistake this seat invites. Hiring on cleaning skill rather than on staffing and retention. Supervisors are judged on coverage and turnover far more than on technique.

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Welding & Fabrication

Commercial Welder

Welding & Fabrication

  1. Which certifications are current, in which positions, and when were they last renewed?

  2. What does the WPS tell you about preheat and interpass temperature, and why does it matter?

  3. You have porosity in a flux-core weld outdoors. What are you checking?

  4. What procedures are you qualified to, and when were you last tested?

  5. How do you set up for an out-of-position weld on structural steel?

  6. What do you do when your weld fails visual or UT inspection?

  7. How do you control distortion on a long run?

  8. What is your approach to prep and fit-up before you strike an arc?

  9. How do you read a weld symbol and what does it tell you about prep?

  10. What is your approach to preheat and interpass temperature?

  11. How do you handle welding on coated or painted material?

  12. What is your process when a procedure calls for a consumable you do not have?

  13. How do you manage fit-up gaps that are outside tolerance?

  14. What is your approach to welding overhead or in a confined space?

  15. How do you handle a repair weld on a crack?

  16. What documentation follows your welds?

Listen for

  • States current certifications by process, position and material, with the dates
  • Can read a WPS and say what in it constrains the work
  • Fit-up described as part of the job rather than someone else's step

The mistake

The mistake this seat invites. Accepting "certified welder" without the process, position and expiry. Certifications are specific and they lapse, and the weld test will find out before the job does.

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Masonry & Concrete

Bricklayer / Mason

Masonry & Concrete

  1. How do you set out a wall so the coursing lands correctly at the openings?

  2. Which mortar type for a structural CMU wall, and why not the one you use on veneer?

  3. Walk me through flashing and weeps at the base of a cavity wall.

  4. How do you set up leads and keep a long wall true?

  5. What is your approach to mixing and matching mortar on a repair?

  6. How do you handle flashing and weeps so the wall actually drains?

  7. What changes in your process in cold or hot weather?

  8. How do you deal with a brick delivery that does not match the existing blend?

  9. How do you set up and maintain coursing on a tall wall?

  10. What is your approach to a lintel or opening detail?

  11. How do you handle efflorescence a customer is complaining about?

  12. What is your process for tuckpointing an older building?

  13. How do you deal with a wall that is out of plumb from the foundation up?

  14. What is your approach to control joints and where do they belong?

  15. How do you protect new work from weather overnight?

  16. What do you check before the scaffold comes down?

Listen for

  • Coursing and layout described as the part that cannot be fixed later
  • Knows mortar types and where each is required rather than using one everywhere
  • Understands flashing, weeps and air gaps as the wall's drainage system

The mistake

The mistake this seat invites. Hiring on units laid per day. Layout and water management decide whether the wall is right; speed only matters after that.

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Concrete Finisher

Masonry & Concrete

  1. How do you know when the slab is ready to float, and what happens if you start early?

  2. Where do your control joints go on a slab with columns, and why there?

  3. The forecast says rain in two hours and the truck is on site. What do you do?

  4. How do you read a slab to know when to start floating?

  5. What causes a slab to craze or dust, and how do you avoid it?

  6. How do you handle a pour that is setting faster than the crew can finish?

  7. What is your approach to joints, and what happens when they are cut late?

  8. How do you finish to a flatness spec, and how do you check it?

  9. How do you handle a pour that starts in the morning and finishes in the afternoon heat?

  10. What is your approach to curing and why does it get shortcut?

  11. How do you deal with a slab that has to meet a specific flatness number?

  12. What is your process for an exposed aggregate or decorative finish?

  13. How do you handle a cold joint you did not plan for?

  14. What is your approach to reinforcing placement and cover?

  15. How do you finish around embeds and penetrations?

  16. What would make you reject a truck?

Listen for

  • Reads the set rather than working to a clock
  • Knows what jointing is for and where the joints have to land
  • Has finished to a flatness specification and knows how it was measured

The mistake

The mistake this seat invites. Screening on general construction labour history. Finishing is a timing judgement under weather pressure, and a slab finished wrong cannot be redone.

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Physical Security

Security Systems Installer / Technician

Physical Security

  1. A reader works but the door will not unlock. How do you isolate the fault?

  2. How do you handle egress and fire alarm release on an access-controlled door?

  3. Cameras drop off the recorder intermittently. Where do you start?

  4. Walk me through commissioning a door with a reader, REX and door position switch.

  5. A reader works intermittently. How do you isolate it?

  6. How do you handle a door that must fail safe versus fail secure, and who decides?

  7. What is your process for camera placement when the client wants identification, not just detection?

  8. How do you document a system so the next technician is not reverse-engineering it?

  9. How do you commission a camera system so the images are actually usable?

  10. What is your approach to a door that must meet life safety egress requirements?

  11. How do you troubleshoot an intercom or call station that fails intermittently?

  12. What is your process for integrating with an existing panel from another manufacturer?

  13. How do you handle credentials and badge data during a system cutover?

  14. What is your approach to a customer who wants to see everything on one screen?

  15. How do you test a system so the customer trusts it?

  16. What do you do when you find a door propped or a reader bypassed?

Listen for

  • Names platforms configured - access control and video management by product - rather than listing manufacturers seen
  • Comfortable on the network side: addressing, VLANs, PoE budgets, switch configuration
  • Has integrated door hardware with fire alarm and life-safety egress requirements

The mistake

The mistake this seat invites. Confusing this role with security guard staffing. It is a low-voltage technical trade with IT skills attached, and it is priced accordingly.

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Low-Voltage Electrician (Security Specialty)

Physical Security

  1. What licence do you hold for low-voltage work in this state and what does it cover?

  2. How do you certify a structured cabling run and what do you do with a failed test?

  3. Where does your PoE budget run out on a switch and how do you plan for it?

  4. How do you pull and terminate cable in a plenum space so it passes inspection?

  5. What is your approach to cable management in a crowded IDF?

  6. How do you test a run, and what do you do with a failed certification?

  7. What separation do you keep from line voltage, and why?

  8. How do you label so the as-built matches what is actually in the wall?

  9. How do you plan pathways and conduit fill for a cabling job?

  10. What is your approach to fire-stopping at penetrations?

  11. How do you handle a cable run that exceeds the distance limit?

  12. What is your process for testing and certifying fibre?

  13. How do you deal with an existing cable plant with no documentation?

  14. What is your approach to grounding a rack and its equipment?

  15. How do you coordinate with the electrical contractor on shared pathways?

  16. What would make you refuse to reuse existing cable?

Listen for

  • Licensing stated accurately for the state, because low-voltage licensure varies and matters
  • Terminations and testing described with the standard used, not just "ran the cable"
  • Understands where limited-energy work still falls under the electrical code

The mistake

The mistake this seat invites. Assuming a licensed electrician can drop straight in. The code sections, the testing standards and the licensure are a different specialty, and the reverse assumption is just as wrong.

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Integration Engineer / Systems Integrator

Physical Security

  1. How do you size recording storage for a two hundred camera system at thirty days?

  2. Walk me through integrating access control with an enterprise directory.

  3. How do you cut over a live access control system without leaving doors unsecured?

  4. How do you design a system that has to work across sites on one head end?

  5. What is your approach to integrating access control with an existing directory?

  6. How do you handle a client requirement that the manufacturer does not support natively?

  7. What does your cutover plan look like when you replace a live system?

  8. How do you size storage and bandwidth for a camera system, and what assumptions do you state?

  9. How do you gather requirements from a client who does not know what they need?

  10. What is your approach to redundancy and failover on a head end?

  11. How do you handle a client security policy that restricts your remote access?

  12. What is your process for a phased migration from an old platform?

  13. How do you manage firmware and software version control across a estate?

  14. What is your approach to integrating video, access and intrusion in one interface?

  15. How do you handle a manufacturer bug that blocks a deliverable?

  16. How do you train a client team to run the system after you leave?

Listen for

  • Thinks in systems and interfaces rather than devices
  • Has done an identity or directory integration and can describe what broke
  • Can size storage and bandwidth for a camera count and retention requirement

The mistake

The mistake this seat invites. Hiring a field technician into a design seat. The integration role is architecture and commissioning, and the failure mode is a system that passes device-by-device and fails as a whole.

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Insulation

Insulation Worker, Mechanical

Insulation

  1. How do you insulate a chilled water line so it does not sweat inside the jacket?

  2. Which material for a 450 degree steam line, and why not fibreglass?

  3. How do you build a removable cover for a valve that gets serviced?

  4. How do you insulate a chilled water line so it does not sweat at the hangers?

  5. What is your approach to vapour barrier continuity, and where does it usually fail?

  6. How do you handle fittings and valves differently from straight runs?

  7. What changes when you are working on a high-temperature line?

  8. How do you deal with existing insulation you suspect contains asbestos?

  9. How do you insulate and jacket a line that runs outdoors?

  10. What is your approach to an elbow or tee so the covering stays weathertight?

  11. How do you handle a line that is already sweating and wet when you arrive?

  12. What is your process for removable covers on valves and flanges?

  13. How do you select thickness and why does it change by service?

  14. What is your approach to working around other trades on a congested rack?

  15. How do you handle insulation that has to be cut into for service later?

  16. What would make you stop and report rather than cover something up?

Listen for

  • Vapour barrier integrity described as the controlling detail on cold work
  • Knows which material goes on which service temperature rather than using one system everywhere
  • Fitting work - elbows, valves, hangers, removable covers - described as the skilled part

The mistake

The mistake this seat invites. Treating mechanical and building insulation as the same trade. Mechanical insulation is fitting work on live systems with material selection attached, and it is the better-paid side.

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Insulation Worker, Floor/Ceiling/Wall

Insulation

  1. How do you insulate and air seal a rim joist so it passes inspection?

  2. What do you do where insulation meets a rated wall penetration?

  3. What goes wrong with batt installation that still looks finished?

  4. How do you hit a specified R-value in a wall assembly that has structural interruptions?

  5. What is your approach to air sealing before insulating?

  6. How do you handle a cavity that cannot be fully filled?

  7. What do you check before spray foam, and what stops the job?

  8. How do you work around other trades who will be back in the same cavity?

  9. How do you handle a wall where the vapour control layer is on the wrong side?

  10. What is your approach to insulating a roof deck versus a ceiling plane?

  11. How do you deal with thermal bridging at structural members?

  12. What is your process for a blower door or air leakage test?

  13. How do you handle an attic with existing contaminated insulation?

  14. What is your approach to fire blocking and draft stopping?

  15. How do you insulate around recessed fixtures and penetrations?

  16. What do you check before the drywall goes up?

Listen for

  • Air sealing treated as part of the install rather than a separate trade
  • Knows the fire-stopping and draft-stop requirements at penetrations and rated assemblies
  • Spray foam work stated with the training and respiratory protection it requires

The mistake

The mistake this seat invites. Assuming any insulation experience covers it. Compressed or gapped batts pass a glance and fail the blower door, and inspectors increasingly check.

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Commercial Pest Control

Pest Control Technician (Licensed Applicator)

Commercial Pest Control

  1. Which licence categories do you hold and when do they renew?

  2. A food plant has recurring activity in one zone. How do you work it?

  3. What goes in your service documentation for a third-party audit?

  4. How do you inspect a commercial kitchen, and in what order?

  5. What is your approach when the same account keeps recurring with the same issue?

  6. How do you decide between treatment and exclusion?

  7. What do you document so an auditor is satisfied?

  8. How do you handle a treatment in a facility that cannot shut down?

  9. How do you build a treatment plan for a recurring rodent issue in a warehouse?

  10. What is your approach to a bed bug call in a commercial setting?

  11. How do you handle a client who will not fix the sanitation issue causing the problem?

  12. What is your process for pesticide records and label compliance?

  13. How do you treat around food preparation areas safely?

  14. What is your approach to exclusion work on an older building?

  15. How do you handle an account that is about to fail an audit?

  16. What do you do when you find evidence of a pest outside your licence scope?

Listen for

  • Licence and category stated for the state, with renewal and CEU status current
  • Identifies before treating, and says so without being prompted
  • Has worked audited accounts - food processing, healthcare, warehousing - and knows what the auditor looks for

The mistake

The mistake this seat invites. Hiring on route experience without checking the licence category against the accounts. An applicator licensed for general pest is not licensed for everything the book contains.

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Elevator Maintenance

Elevator Mechanic / Service Technician

Elevator Maintenance

  1. Which licence do you hold and in which states does it travel?

  2. A car is shutting down intermittently with no fault logged. How do you work it?

  3. Walk me through adjusting a door operator that is nuisance-reversing.

  4. How do you troubleshoot a car that stops level but will not open?

  5. What is your approach to a door operator that is nuisance-reversing?

  6. Walk me through what you check on a traction machine during maintenance.

  7. How do you handle an entrapment call?

  8. What do you do when you find a safety issue the building does not want to pay to fix?

  9. How do you troubleshoot a car that is running slow or rough?

  10. What is your approach to a hydraulic unit that is drifting down?

  11. How do you handle a governor or safety test?

  12. What is your process for leveling complaints that only happen when loaded?

  13. How do you deal with a controller from a manufacturer you do not usually service?

  14. What is your approach to pit and hoistway housekeeping and why does it matter?

  15. How do you handle a call where the building wants the car back in service before you are finished?

  16. What would make you lock a car out?

Listen for

  • Union apprenticeship or state licence stated accurately, with the jurisdiction
  • Names controller platforms troubleshot rather than manufacturers seen
  • Door-related callbacks treated as the bulk of service work, because they are

The mistake

The mistake this seat invites. Recruiting this seat like general mechanical maintenance. It is a licensed, largely unionised trade with a controlled supply of labour, and the hiring process has to respect that.

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Elevator Project Manager

Elevator Maintenance

  1. What drives your schedule on a modernisation, and what do you order first?

  2. The hoistway is not ready on the date you were promised. What do you do?

  3. Walk me through the inspection and permitting sequence to turnover in this state.

  4. How do you schedule a modernisation in a building that cannot lose both cars?

  5. What is your approach to a long lead time on controller equipment?

  6. How do you coordinate with the general contractor on hoistway readiness?

  7. What does your turnover to the service department include?

  8. How do you handle a state inspection that fails during a modernisation?

  9. How do you plan a modernisation with the building still occupied?

  10. What is your approach to a hoistway that does not match the drawings?

  11. How do you coordinate the electrical and fire alarm interfaces?

  12. What is your process for state inspection scheduling and sign-off?

  13. How do you handle a lead time that pushes past the contract date?

  14. What is your approach to the temporary use period during construction?

  15. How do you manage a dispute over existing conditions?

  16. What do you hand over to the service department at completion?

Listen for

  • Plans around equipment lead times as the dominant schedule constraint
  • Knows the state inspection and permitting path, which is not the same in two places
  • Has coordinated hoistway readiness with a general contractor and been let down once

The mistake

The mistake this seat invites. Treating it as general construction project management. The equipment lead times, the licensed labour and the state inspection regime are the whole schedule.

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QEI-Certified Inspector

Elevator Maintenance

  1. Walk me through a category one test and the items that most often fail.

  2. How do you handle a unit that is unsafe but in service in an occupied building?

  3. How do you word a finding so the owner knows what is a violation and what is advice?

  4. Walk me through a full load safety test and what you are verifying.

  5. How do you handle a unit that passes the test but concerns you?

  6. What is your approach when a contractor disputes a finding?

  7. How do you document an inspection so it holds up later?

  8. What do you check on a hydraulic unit that you would not on a traction unit?

  9. How do you approach a building with no inspection history?

  10. What is your process for witnessing a category test?

  11. How do you handle an installation that meets an older code but not the current one?

  12. What is your approach to documenting a deficiency so it is actionable?

  13. How do you deal with pressure from a building owner to pass a unit?

  14. What is your approach to firefighters emergency operation testing?

  15. How do you handle a disagreement with a mechanic on site?

  16. What do you do when you find a condition that is immediately dangerous?

Listen for

  • QEI certification current, with the certifying organisation and the jurisdictions worked
  • Can describe a category five test and what commonly fails it
  • Writes findings that distinguish code violations from maintenance recommendations

The mistake

The mistake this seat invites. Assuming any experienced mechanic can take the seat. QEI is a separate certification with its own examination and continuing requirements, and the pool is small.

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LED & Solar

Solar Photovoltaic Installer

LED & Solar

  1. How do you attach racking on a membrane roof without voiding the warranty?

  2. What does the code require for rapid shutdown and how do you verify it works?

  3. A string is reading low at the combiner. How do you trace it?

  4. How do you attach to a roof without creating a leak path?

  5. What is your approach to string sizing in cold weather?

  6. How do you handle a roof plane that is partially shaded?

  7. Walk me through your commissioning checks before energising.

  8. What do you do when the array layout does not match the plan set?

  9. How do you handle a roof penetration on a membrane roof without voiding the warranty?

  10. What is your approach to module layout around obstructions and setbacks?

  11. How do you deal with a racking system you have not used before?

  12. What is your process for torque and fastener verification?

  13. How do you handle working on a roof in high wind?

  14. What is your approach to DC wire management so nothing chafes?

  15. How do you deal with a module damaged during installation?

  16. What do you check before you call the array mechanically complete?

Listen for

  • Knows the attachment detail and who holds the roof warranty
  • Describes rapid shutdown and labelling requirements as code, not paperwork
  • Fall protection stated as a working practice rather than a certificate

The mistake

The mistake this seat invites. Hiring residential installers for commercial work without checking the structural and electrical scale-up. The systems, the attachments and the inspection are different.

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Electrician (LED & Solar)

LED & Solar

  1. Walk me through an interconnection from application to permission to operate.

  2. How do you size conductors and overcurrent protection on a PV circuit?

  3. A networked lighting control system is not holding its schedule. How do you commission it?

  4. How do you size and terminate at the point of interconnection?

  5. What is your approach to rapid shutdown compliance?

  6. How do you troubleshoot a string producing below expectation?

  7. What do you check on an existing service before you tie a system into it?

  8. How do you handle an inspection comment on labelling and signage?

  9. How do you perform a load calculation before adding a system to an existing service?

  10. What is your approach to conductor sizing and voltage drop on a long DC run?

  11. How do you handle an inverter fault code you have not seen?

  12. What is your process for commissioning and system verification?

  13. How do you deal with utility interconnection requirements and witness testing?

  14. What is your approach to a retrofit where the existing panel is full?

  15. How do you handle arc fault or ground fault trips on a new array?

  16. What would make you refuse to energise?

Listen for

  • Electrical licence current for the jurisdiction, stated without hedging
  • Has done an interconnection and dealt with the utility, not just the inverter
  • Lighting controls described as commissioning work rather than device installation

The mistake

The mistake this seat invites. Treating retrofit work as device swapping. The licensed electrical scope, the interconnection and the controls commissioning are where the job succeeds or stalls.

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Commercial Trucking

CDL-A Truck Driver

Commercial Trucking

  1. Walk me through securing a piece of equipment on a flatbed.

  2. You are approaching your hours limit and the receiver is running late. What do you do?

  3. What do you check on a pre-trip that drivers most often skip?

  4. Walk me through your pre-trip, and what would take the truck out of service.

  5. How do you secure an uneven load, and what are you working from?

  6. What do you do when you are running out of hours short of the delivery?

  7. How do you handle a delivery site that is not safe to back into?

  8. What is your process after any contact, however minor?

  9. How do you plan a route with bridge and weight restrictions?

  10. What is your approach to a load that shifts in transit?

  11. How do you handle a roadside inspection?

  12. What is your process for logging and hours of service compliance?

  13. How do you deal with a customer site with no safe turnaround?

  14. What is your approach to winter driving and when do you shut down?

  15. How do you handle a mechanical fault that develops mid-route?

  16. What do you do when dispatch asks you to do something you believe is unsafe?

Listen for

  • Clean MVR and a stable work history, with gaps explained rather than hidden
  • Endorsements stated - tanker, hazmat, doubles - with current medical card
  • Load securement described specifically for the trailer type they actually run

The mistake

The mistake this seat invites. Hiring on licence class alone. Insurability, MVR and endorsement fit decide whether the driver can actually run the work, and that is checked before the interview, not after.

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CDL-B Truck Driver

Commercial Trucking

  1. What equipment have you operated from the truck, and what certifications go with it?

  2. How do you set up and level a boom truck on a sloped site?

  3. What is on your pre-trip for a dump truck that is not on a straight truck?

  4. How does your pre-trip change on a straight truck with a lift gate?

  5. What do you check on weight distribution for a multi-stop route?

  6. How do you handle a customer who wants you to leave material somewhere unsafe?

  7. What do you do when a delivery is refused?

  8. How do you plan a route with tight urban access?

  9. How do you secure material on a flatbed or stake body?

  10. What is your approach to operating a lift gate safely alone?

  11. How do you handle a residential or tight commercial delivery?

  12. What is your process for proof of delivery and paperwork?

  13. How do you deal with a damaged product discovered at delivery?

  14. What is your approach to daily vehicle inspection reports?

  15. How do you handle loading at a yard with other equipment moving?

  16. What makes you refuse a load?

Listen for

  • Equipment operation on the truck described as part of the job, because it usually is
  • Endorsements and any crane or equipment certifications stated with the licence
  • Comfortable with the customer-facing and crew-facing side of a service truck

The mistake

The mistake this seat invites. Treating the seat as a lower rung of CDL-A. On trades work the value is the equipment operation and the site conduct, not the driving.

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Commercial Irrigation

Irrigation Technician / Installer

Commercial Irrigation

  1. A zone will not come on and the controller shows no fault. How do you trace it?

  2. How do you check that a zone is applying water evenly?

  3. Walk me through winterising a commercial system.

  4. A zone will not come on. Walk me through isolating it.

  5. How do you find a wire fault without digging up the whole run?

  6. What is your approach to a head-to-head coverage problem on an existing system?

  7. How do you winterise a commercial system, and what goes wrong when it is rushed?

  8. How do you adjust a controller for a property with mixed sun and shade?

  9. How do you perform a full system audit on a commercial property?

  10. What is your approach to a mainline break you cannot immediately locate?

  11. How do you handle a controller with no documentation or labelling?

  12. What is your process for pressure testing after a repair?

  13. How do you deal with a zone that has mixed head types?

  14. What is your approach to a smart controller or weather-based schedule?

  15. How do you handle a water restriction or ordinance on an account?

  16. What do you leave with the property manager after a service visit?

Listen for

  • Uses a wire tracker and a solenoid test rather than digging to find the fault
  • Knows head spacing and precipitation rate, not just which head fits
  • Has programmed smart controllers and understands what the sensors are actually doing

The mistake

The mistake this seat invites. Hiring landscape labourers into irrigation service. The troubleshooting is electrical and hydraulic diagnosis, and installation experience does not supply it.

Print a scorecard for this role Commercial Irrigation hiring kit Role profile

Backflow Prevention Specialist

Commercial Irrigation

  1. Which assembly is required on a high-hazard connection, and why not a double check?

  2. Walk me through a reduced pressure assembly test and what a failure looks like.

  3. When was your gauge last calibrated and who holds the record?

  4. Walk me through testing a reduced pressure assembly and what each step proves.

  5. What do you do when an assembly fails and the building cannot lose water?

  6. How do you handle a report that the jurisdiction rejects?

  7. What is your process for repair versus replacement on a failed assembly?

  8. How do you verify an assembly is installed at the right point and orientation?

  9. How do you handle a test on an assembly you cannot safely isolate?

  10. What is your approach to a double check versus a reduced pressure assembly?

  11. How do you deal with a thermal expansion issue after a repair?

  12. What is your process for calibrating and maintaining your test kit?

  13. How do you handle an assembly installed below grade?

  14. What is your approach to a property with multiple assemblies and one shutdown window?

  15. How do you explain a failure to a property manager who thinks it is fine?

  16. What do you do when the jurisdiction and the manufacturer disagree?

Listen for

  • Certification current for the jurisdiction, with gauge calibration in date
  • Knows which assembly type is required for which hazard level
  • Describes the filing and recordkeeping as part of the job rather than paperwork after it

The mistake

The mistake this seat invites. Assuming an irrigation technician can test. Backflow certification is separate, jurisdiction-specific, and the test is only valid if the tester and the gauge are both current.

Print a scorecard for this role Commercial Irrigation hiring kit Role profile
Questions

About the question bank.

Is there a free interview question bank for commercial trades hiring?

My Trade Talent's interview question bank holds 896 technical screening questions for 56 commercial trades roles across 20 trades, three per role, each set with the signals that separate a strong candidate from a plausible one and the hiring mistake that seat invites. It is free and open, with no sign-up, and every set links to a printable scorecard for the role.

What interview questions should I ask a commercial HVAC service technician?

Test diagnostic reasoning, not just the EPA 608 card. My Trade Talent's question bank asks: "Walk me through diagnosing a rooftop unit that cools fine in the morning and short-cycles by two in the afternoon." "What superheat would you expect on a properly charged R-410A system, and what does it tell you when it reads high?" "A tenant says it is too warm and the space is at setpoint. What do you check and in what order?" "A rooftop unit trips on high head pressure only on hot afternoons. Where do you start, and what would rule the condenser out?" "How do you tell a failed run capacitor from a failing compressor on a call-out, with no parts on the truck?" "A customer has had three technicians out for the same intermittent fault. What do you do differently on the fourth visit?" "When do you recover and weigh in a charge rather than top it up, and how do you make that call?" "Walk me through everything you check before you condemn a compressor." "When do you use subcooling rather than superheat to judge a charge?" "A unit is running but not cooling well and the charge checks out. Where do you go next?" "Tell me how an economizer is supposed to work, and the three ways you most often find them broken." "Hand me a wiring diagram for a unit you have never seen. How do you use it?" "Describe your lockout procedure on a rooftop unit with a disconnect you cannot see from where you are working." "Talk me through recovering refrigerant from a unit you are replacing." "Explain to me, as if I am the building manager and not a technician, why the unit failed." "What stops you from going up on a roof?"

Why technical questions rather than behavioural ones?

Because everyone who applies for a trades seat will claim the experience. A technical question about a real fault, code or sequence exposes whether the candidate has done the work, which a question about teamwork or strengths does not.

How do I score the answers consistently?

Use the scorecard builder: pick the role and it prints the same questions and strong-candidate signals as rated rows on a 1 to 4 scale, so two interviewers score the same things the same way.

Trade Talk A monthly hiring brief for commercial trades employers

What changed in your trade this month, and what to do about it.

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  • Where wages moved in your trade, by market, and what that does to your next offer
  • How long roles like yours are taking to fill, and where it is getting worse
  • Interview and screening tactics that are landing candidates this month
  • What contractors competing for the same people are doing differently

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