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 OK-ROOF exam has 50 questions and runs 2 hours 30 minutes.
These 10 free OK-ROOF questions are organized by exam domain, so you can see how each part of the Oklahoma Roofing Contractor Commercial Endorsement Examination blueprint is tested. Reveal the answer and explanation under each question.
A 4:12 roof is described as steep-slope in the roof-system specification but as low-slope in the fall-protection plan. Which classification pair is accurate?
Correct answer: A - Steep-slope under NRCA; low-slope under OSHA
During installation, two clean, dry EPDM sheets are aligned for a field seam. The seam should use:
Correct answer: D - Approved EPDM primer and pressure-sensitive seam tape, followed by rolling
While welding TPO seams, the wind increases and generator voltage begins to fluctuate. The last completed seam has no obvious defect when hand-probed. Before production welding continues, the foreman should:
Correct answer: B - Make and peel-test a new test weld, then adjust the equipment as indicated
A test pass of sprayed polyurethane foam cures soft, dark, oily, and friable. The coating crew is standing by. The appropriate disposition is to:
Correct answer: D - Remove it to sound material, correct the spray conditions, and respray
A 60-foot aluminum roof panel is fixed at one end. Use ΔL = α × L × ΔT, with α = 0.0000129 in/in/°F and a metal-temperature change of 120°F. The free-end joint allows 0.50 inch of movement. Which conclusion is correct?
Correct answer: A - The panel expands about 1.11 inches, so the free-end joint lacks sufficient movement capacity
A galvanized-steel gutter below copper flashing is corroding rapidly only where runoff from the copper reaches it. The most likely cause-and-correction pair is:
Correct answer: C - Copper runoff corrosion; isolate the metals or divert the runoff
On a rain-free winter morning, droplets appear mainly along steel-deck side laps. Indoor air is 70°F at 50% RH, with a dew point near 50°F. The deck measures 46°F at the laps and 54°F in the field, and smoke testing shows outward airflow at the laps. Which diagnosis and first corrective priority fit the findings?
Correct answer: D - Air-leakage condensation at the laps; seal the air-control plane
Core cuts confirm two complete existing roof-covering applications. The roof is dry, the deck is sound, and the structure can carry the proposed added load. Under the 2018 IBC roof-recover baseline, the contractor must:
Correct answer: B - Tear off the existing coverings; two applications bar recover
An infrared survey of a ballasted roof shows several warm anomalies after sunset, but ballast depth varies and no cores have been taken. The contractor should base tear-off limits on:
Correct answer: C - Representative cores or probes at anomalies and comparison areas
Roofers are replacing edge metal on a 6:12 roof, 8 feet above a lower level. Which protection arrangement satisfies the OSHA construction baseline for this exposure?
Correct answer: A - Guardrails with toeboards, safety nets, or a personal fall-arrest system
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