Oklahoma Roofing Contractor Commercial Endorsement Practice Exam
Code edition notice: Oklahoma's PSI candidate bulletin (effective August 31, 2026) allows either the 2018 or the 2024 edition of the International Building Code (IBC) on this exam from September 14, 2026 through December 13, 2026. Starting December 14, 2026, only the 2024 editions are permitted.
This practice exam cites the 2024 edition. Where a 2018 section number differs, the answer review shows it in parentheses. Chapter 15 differences: the 2018 Reroofing section 1511 is section 1512 in 2024; radiant barriers moved from 1509 to 1510; wind-resistance subsections 1504.3 through 1504.5 shifted to 1504.4 through 1504.6; scupper sizing moved out of section 1502.3 to the International Plumbing Code (section 1108.3); parapets moved from 705.11 to 705.12; conventional roof framing moved from 2308.7 to 2308.11. If you test on or after December 14, 2026, study from and bring the 2024 books.
Free Practice Exam
Test your knowledge with 10 questions from our pool of 20 free questions.
- 10 questions per attempt
- 30 minute time limit
- Unlimited attempts
- A new mix each time
- Instant results
Full Practice Exam
Complete exam simulation matching the real PSI test format.
- 50 questions (same as real exam)
- 150 minute time limit
- 6 topic areas covered
- 353 questions in pool
- Detailed explanations
Texts preferred · 9am–9pm Central
Oklahoma Roofing Contractor Commercial Endorsement Practice Exam Guide
What's on the exam
Questions per topic, out of 50This exam covers commercial roofing work from the deck up: how low-slope and steep-slope systems are built, what the building code says about roof coverings and reroofing, how architectural metal and sheet metal flashing are detailed, how moisture and heat move through a roof assembly, how to judge whether a roof gets re-covered or torn off, and the OSHA rules that govern the crew doing the work. It is an open book exam, so the skill being tested is finding the right page fast and reading it correctly.
You get two ways to practice here. The free practice exam gives you 10 questions per attempt, and you can retake it as often as you like. The full practice exam gives you 50 questions on a 150 minutes clock, drawn fresh from our question bank every attempt, so a second run is never the same paper as the first.
General Roofing Knowledge 5 items
Expect code questions on which roof coverings are allowed as combustible materials in Type I and II construction (International Building Code (IBC) 2024, Section 603.1, Item 4) and when combustible roof insulation is permitted in any construction type (International Building Code (IBC) 2024, Section 720.5). Steep-slope fundamentals appear too: minimum nails per full-length three-tab strip shingle and how far nails must extend through thin plywood decks (NRCA Roofing Manual: Steep Slope Roof Systems, Section 4.2—Asphalt Shingle Roof System Design and Installation (Fasteners)), the underlayment configuration prescribed at 4:12 and greater (Section 3.2—Underlayment Design and Installation), and clay tile grades for frost resistance (Section 4.1—Clay and Concrete Tile Materials (Standards)).
Low Slope Roofing 15 items
The heaviest topic on the outline. Questions run through insulation practice — a minimum of 6 inches of offset between board joints in adjacent layers of flat stock insulation (NRCA Roofing Manual: Membrane Roof Systems, Chapter 4, Page 137), saddle and cricket slope rules and the 8-inch minimum flashing height at raised curbs (Chapter 4, Page 177 and Page 173), perlite cover board types (Chapter 4, Pages 155-156) — plus membrane specifics: ASTM D312 asphalt types by slope, kettle temperature limits, EPDM classifications, PVC minimum thickness, ballast rates, and sheet orientation across steel deck flutes (Chapter 5, Pages 192, 199, 216-217, 217, 221 and 222). Code items cover reinstalled materials (International Building Code (IBC) 2024, Section 1512.4 (2018 ed.: Section 1511.5)) and wood shake re-cover (International Building Code (IBC) 2024, Section 1512.3.1 (2018 ed.: Section 1511.4)). There is also straight coverage math.
Architectural Metal Roofing Systems and Sheet Metal Flashing 9 items
Fastener compatibility with copper panels comes straight out of International Building Code (IBC) 2024, Section 1507.4.4. Coping width is set by International Building Code (IBC) 2024, Section 1503.3.1 (2018 ed.: Section 1503.3), and the standing-seam re-cover exception by International Building Code (IBC) 2024, Section 1512.3 (2018 ed.: Section 1511.3.1). NRCA supplies minimum slopes for architectural panels and the reduced valley slope that results (NRCA Roofing Manual: Metal Panel and SPF Roof Systems, Pages 24-25 and Page 47), gutter expansion joint spacing (NRCA Roofing Manual: Architectural Metal Flashing and Condensation and Air Leakage Control, Page 93), and built-in gutter metals. Oil canning and tension precision leveling appear too.
Moisture and Energy Control 6 items
These questions ask you to think like the dew-point calculation. A ventilated airspace carries an R-value of zero in the temperature gradient (NRCA Roofing Manual: Architectural Metal Flashing and Condensation and Air Leakage Control, Pages 242-243). Unvented attics with air-permeable insulation require rigid board or sheet insulation above the sheathing (International Building Code (IBC) 2024, Section 1202.3). Thermal short circuits at fasteners and supports, loose-laid polyethylene failing as an air barrier, and multiple insulation layers as a moisture relief mechanism all come from Architectural Sheet Metal Manual, Appendix F. For dew-point and vapor retarder calculations, tapered systems are analyzed at the minimum R-value (NRCA Roofing Manual: Membrane Roof Systems, Pages 173-176).
Repairs and Reroofing 8 items
Evaluation drives this topic. Verify roof structure capacity before a re-cover, because the added weight can reduce live load capacity (NRCA Roofing Manual: Steep Slope Roof Systems, Chapter 6—Reroofing, Section 6.5). Counterflashing reuse turns on remaining service life (Asphalt Shingle Roof Systems, Chapter 6—Reroofing, Section 6.2). Expect leak-source questions where water travels laterally or upslope, and non-roof sources such as clogged condensate discharge lines or plumbing piping that a new roof will not fix (Metal Shingle Roof Systems, Chapter 6—Reroofing, Page 462). Slate repair covers the nail-and-bib friction fit (Slate Roof Systems, Appendix 2—Slate Repair, Step 4, Page 632).
Safety 7 items
Straight OSHA 29 CFR 1926 recall. Know the fire extinguisher rating required per 3,000 square feet of protected building area (OSHA 1926.150(c)(1)(i)) and the site alarm system requirement (OSHA 1926.150(e)(1) and (e)(2)). Know the definition of a competent person — capable of identifying hazards and authorized to correct them (OSHA 1926 CFR 29, Page 31). Also covered: only employees qualified by training or experience operate equipment, danger sign colors, weekly first aid kit checks (§1926.50(d)(2)), instruction on harmful substances (§1926.21(b)(3)), and employer responsibility for PPE.
Sample 1 — Low Slope Roofing
Question: Liquid Applied Membrane Coverage You are coating a 2,400 sq ft flat roof with liquid membrane. The spec calls for two coats at 1.5 gallons per 100 sq ft. How many total gallons are needed?
- A. 50 gallons
- B. 60 gallons
- C. 72 gallons
- D. 80 gallons
Correct Answer: C
Work it in two steps and you cannot miss it. First combine the coats: 1.5 gallons × 2 coats = 3 gallons per 100 square feet. Then find how many 100-square-foot units are on the roof: 2,400 ÷ 100 = 24. Multiply: 24 × 3 = 72 gallons. Do the coats first, the area second.
Sample 2 — Architectural Metal Roofing Systems and Sheet Metal Flashing
Question: You are designing a built-in gutter system for a commercial building. To ensure that any overflow spills over the front rather than into the building, what is the minimum elevation difference required between the front edge and the back edge of the gutter?
- A. ¾ in.
- B. ½ in.
- C. 1½ in.
- D. 1 in.
Correct Answer: D
The highest point on the front of a built-in gutter must be a minimum of 1 in. (25 mm) lower than the back edge. That difference is the whole safety valve in the detail: when the gutter fills past capacity, water rolls out over the front face instead of backing up over the rear edge and into the building. Answer D is the minimum, so the smaller dimensions in A and B fail the requirement, and 1½ in. is more than the manual requires as a minimum. Citation: Architectural Sheet Metal Manual, Page 1.16.
Sample 3 — Repairs and Reroofing
Question: You are evaluating a slate roof system for replacement on a building with a ventilated attic. During the attic inspection, you find insulation blocking eave vents. What is the intended function of the eave baffles that should be installed at the base of rafter bays?
- A. To serve as a fire stop between adjacent rafter bays
- B. To redirect condensate away from the fascia board
- C. To prevent attic or rafter space insulation from obstructing intake vent openings
- D. To support the weight of replacement sheathing panels
Correct Answer: C
Eave baffles are installed at the base of rafter bays or between trusses for one reason: to keep attic or rafter space insulation from blocking the intake vent openings. Block those intakes and the ventilation system cannot produce the uniform rising airflow under the roof deck that moves moisture and heat out. The baffle is not structural and it is not a fire stop. Citation: NRCA Roofing Manual: Steep Slope Roof Systems, Slate Roof Systems, Chapter 6—Reroofing, Page 578.
Your first full attempt is a diagnostic, not a verdict. Take it cold, with your books, and see where you land against 70% correct. A score below that on day one tells you which references you cannot find your way around yet — nothing more.
After that, read the topic breakdown before you read the total. The total hides where the damage is. If you dropped six items in Low Slope Roofing and one in Safety, you know exactly which manual sits on the table tonight.
Weight your study by the outline. Low Slope Roofing carries 15 items and Architectural Metal Roofing carries 9. Those two are almost half the paper. Repairs and Reroofing at 8, Safety at 7 and Moisture and Energy Control at 6 come next. General Roofing Knowledge at 5 is real, but a perfect score there will not carry a weak low-slope performance.
Retake the full practice exam after you have worked the weak topic, not the next morning. You want the second attempt to measure new knowledge, not memory of the last draw.
Reaching for the code section named in your head instead of the one on the page. Reroofing questions in Repairs and Reroofing and Low Slope Roofing turn on precise sections — reinstalled materials in International Building Code (IBC) 2024, Section 1512.4 (2018 ed.: Section 1511.5), combustible concealed spaces over wood shakes in International Building Code (IBC) 2024, Section 1512.3.1 (2018 ed.: Section 1511.4). Read the actual sentence on the page.
Confusing "recommended" with "minimum." Built-in gutter front edge, 1 inch. Coping cap bottom edge below the wall material, 1 inch. Curb flashing height over tapered insulation, 8 inches (NRCA Roofing Manual: Membrane Roof Systems, Chapter 4, Page 173). Look it up; do not trust recall.
Skipping a step in coverage math. Two coats means doubling the rate before you divide by 100. Running the area first and forgetting the second coat gives 36 gallons, which is not one of the choices.
Mixing up architectural and structural metal panel minimums. Architectural panels on a nailable deck need a steeper minimum slope than structural panels, and a valley cuts that slope further (NRCA Roofing Manual: Metal Panel and SPF Roof Systems, Pages 24-25 and Page 47). Read which system the stem names.
Treating a leak as a roof problem by default. Clogged condensate lines, plumbing piping and parapets above the flashing line are non-roof sources, and a new roof will not stop them (NRCA Roofing Manual: Steep Slope Roof Systems, Metal Shingle Roof Systems, Chapter 6—Reroofing, Page 462).
Losing the clock in your books. With 150 minutes for 50 questions you have about 3 minutes per question. Answer what you know first, then spend your lookups on the items that need them.
| Questions | 50 questions |
| Time limit | 150 minutes |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $92 |
- Results are given on screen immediately after the examination, with a diagnostic report of strengths and weaknesses for those who do not pass.
- A 30-day wait follows a first failure; electrical exams keep a 30-day wait for further retests, while all other exams require 90 days from the second failure onward.
Source: State of Oklahoma Electrical, Mechanical, Roofing, and Plumbing Examinations Candidate Information Bulletin, Effective 9/11/2026 (Copyright © 2026 by PSI). Check the bulletin before test day: fees and rules can change.