10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CL exam has 100 questions and runs 2 hours.
These 10 free CL questions are organized by exam domain, so you can see how each part of the Crew Leader blueprint is tested. Reveal the answer and explanation under each question.
For a vented attic, a work order reads: “Fill the open kitchen soffit with fiberglass, then add loose-fill insulation.” The opening connects the living space to the attic and contains no heat source or required ventilation opening. Which replacement instruction corrects the air-barrier defect?
Correct answer: D - Fit and edge-seal a supported air barrier, then install the specified insulation.
A certified renovation firm will replace a window in a 1965 single-family home for compensation. Four square feet of paint will be disturbed, and no acceptable lead-free determination is available. A certified renovator and trained workers are assigned. Under the federal EPA Renovation, Repair and Painting Rule, how should the work be treated?
Correct answer: D - As covered renovation; apply RRP without first testing the paint.
A dense-pack takeoff lists 480 ft² of net 2×4 wall cavity area, with framing and openings already deducted. The cavities are 3.5 inches deep. The product requires 3.5 lb/ft³ installed density and comes in 30-lb bags. Four unopened bags are already allocated to this job. With no waste allowance, what is the smallest additional delivery that will cover the planned installation?
Correct answer: B - 13 bags
Four equally productive, qualified installers must complete 12 labor-hours of crawl-space work and 6 labor-hours of exterior sealing. The crawl space safely accommodates only two installers, with no useful supporting task for a third. Exterior work can run concurrently. A one-hour final inspection must follow completion of both tasks. Ignoring setup and breaks, what is the earliest the work and inspection can be finished?
Correct answer: B - 7 elapsed hours
As the crew arrives, a carbon monoxide alarm sounds. The homeowner reports a headache and nausea, and the crew leader’s ambient monitor reads 86 ppm in the living room. The source has not been identified. What takes priority?
Correct answer: A - Move everyone outside and call emergency services from a safe location.
The initial walkthrough reveals damaged energized wiring in the attic. The area is secured, and attic work is held pending a licensed electrical repair and the program manager’s written change-order approval. The crew also has approved ground-level exterior sealing that is safely independent of the attic work. How should the leader use the crew while authorization is pending?
Correct answer: D - Proceed with the independent exterior work while arranging the authorized electrical repair.
A bedroom is comfortable with its door open but becomes cold when the door is closed. With the air handler running, the bedroom measures +8 Pa relative to the hall; opening the door reduces the difference to +0.3 Pa. The supply register is open, and the central return is in the hall. Which defect should be investigated before changing the heating equipment?
Correct answer: B - An inadequate return-air path from the bedroom to the hall
During a winter infrared scan, a faint cool area appears at a ceiling-to-wall junction. When the blower door holds the house at -50 Pa relative to outdoors, irregular cold streaks spread from that junction. Narrow cool lines over nearby framing remain unchanged. The changing pattern most strongly supports which explanation?
Correct answer: A - Unconditioned air is entering through a discontinuity in the ceiling air barrier.
A sound sheet-metal supply plenum has a 1-inch-by-2-inch opening that is fully accessible. The project uses Standard Work Specifications 5.0106.1 for duct repairs. Which repair should the crew leader approve?
Correct answer: C - Mechanically fasten a rigid patch, then seal its edges with fiberglass mesh and mastic.
Twice, a new installer’s patch has detached from dusty wood. The installer can recite the air-sealing procedure, and the sealant is compatible with the substrate and within its temperature limits. To establish practical competence, the crew leader should:
Correct answer: C - Demonstrate surface preparation, then observe the installer rework and check the patch.
The CL exam also covers these domains. Drill them in the full free practice test:
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