- Exam Domain Overview
- Domain 1: General Roofing Knowledge
- Domain 2: Low Slope Roofing
- Domain 3: Architectural Metal Roofing Systems and Sheet Metal Flashing
- Domain 4: Moisture and Energy Control
- Domain 5: Repairs and Reroofing
- Domain 6: Safety
- How Domain Weighting Should Drive Your Study Time
- Question Format and What "Open Book" Really Means
- A Domain-by-Domain Study Timeline
- Frequently Asked Questions
- The OK-ROOF commercial technical exam covers 6 domains across 50 scored questions in 2 hours 30 minutes.
- Low Slope Roofing is the single largest domain, so it deserves the largest share of your study hours.
- The exam is open book, computer delivered, and permits a silent nonprinting nonprogrammable calculator.
- Up to 10 unscored experimental items may appear but don't count against your 70% passing threshold.
Exam Domain Overview
Anyone researching what OK-ROOF actually is quickly learns it's not a single monolithic test - it's a structured technical exam built around six defined content areas. The Oklahoma Construction Industries Board (CIB) sets the scope, PSI administers the delivery, and every one of the 50 scored questions on the commercial roofing technical exam is mapped to one of these six domains. Understanding how those domains are structured - and roughly how much weight each carries - is the single most efficient way to plan your prep time.
This guide breaks down each domain in detail: what it covers, why it matters to a commercial roofing contractor working in Oklahoma, and how to prioritize it relative to the others. If you haven't yet reviewed the baseline eligibility rules, it's worth reading OK-ROOF Requirements 2026 first, since domain mastery only matters once you're actually eligible to sit for the exam.
Domain 1: General Roofing Knowledge
General Roofing Knowledge
This foundational domain establishes the vocabulary and baseline technical literacy the rest of the exam builds on. Candidates need working familiarity with roofing terminology, common material categories, and the basic principles that govern how roof systems are assembled and how they fail.
- Roofing terminology and industry-standard nomenclature used across commercial specifications
- Basic material properties for membranes, metals, and underlayments
- Fundamental roof system design principles and how slope, drainage, and substrate interact
Because this domain underpins everything else, weak fundamentals here tend to create ripple effects on questions in Low Slope Roofing and Repairs and Reroofing later in the exam. If a term or system concept feels unfamiliar in Domain 1, don't skip past it - chase it down before moving on.
Domain 2: Low Slope Roofing
Low Slope Roofing
This is the largest domain on the OK-ROOF commercial exam, and it deserves proportionally more of your prep time than any other content area. Low slope systems dominate commercial roofing work in Oklahoma - think retail centers, warehouses, and office buildings - so it's logical that this domain carries the heaviest weight.
- Membrane roofing systems: single-ply, modified bitumen, and built-up roofing (BUR) assemblies
- Attachment methods: mechanically fastened, fully adhered, and ballasted systems
- Drainage design, tapered insulation systems, and ponding water mitigation
- Seam types, flashing details, and termination methods specific to low slope assemblies
Key Takeaway
Because Low Slope Roofing is the largest domain, allocate more study sessions to it than to any other domain - treat it as the backbone of your review, not just one topic among six.
If you're building a personal question bank or reviewing practice material, weight your repetitions here accordingly. A candidate who is strong across five domains but shaky on Low Slope Roofing is statistically fighting an uphill battle given how many scored questions likely draw from this content area.
Domain 3: Architectural Metal Roofing Systems and Sheet Metal Flashing
Architectural Metal Roofing Systems and Sheet Metal Flashing
Metal roofing and flashing detailing form a distinct technical skill set from membrane work, and this domain tests that separately. Expect questions on panel systems, seam configurations, and the flashing details that keep water out at every transition point.
- Standing seam and architectural metal panel systems, including expansion and contraction allowances
- Sheet metal flashing fabrication and installation at penetrations, valleys, and terminations
- Fastening methods and clip systems appropriate to different metal profiles
- Compatibility issues between dissimilar metals and adjacent roofing materials
This domain also connects to the CIB's referenced steep slope material - current PSI references point to the 2025 NRCA Steep Slope manual, which covers flashing detail work that overlaps with architectural metal applications even on lower-pitch commercial assemblies.
Domain 4: Moisture and Energy Control
Moisture and Energy Control
This domain shifts focus from installation mechanics to building science: how moisture moves through a roof assembly, how vapor drive works, and how insulation and air barrier decisions affect long-term performance.
- Vapor retarders and vapor drive direction based on climate conditions
- Insulation types, R-values, and placement within the roof assembly
- Condensation control and moisture accumulation prevention
- Energy code considerations relevant to commercial roof assemblies
Candidates who come from a purely hands-on installation background sometimes underestimate this domain because it's more conceptual than procedural. Don't let that be your blind spot - building science questions are just as scored as installation questions.
Domain 5: Repairs and Reroofing
Repairs and Reroofing
This domain tests judgment as much as knowledge: when to repair versus replace, how to evaluate an existing roof's condition, and how to properly tear off or overlay a system without compromising the new installation.
- Roof condition assessment and failure diagnosis
- Tear-off procedures versus recover/overlay decision criteria
- Repair techniques for both low slope and metal systems
- Integration of new materials with existing substrates and flashing
Because so much commercial roofing revenue in Oklahoma comes from reroofing existing buildings rather than new construction, this domain reflects real-world job demand. It's also a domain where the OK-ROOF Cheat Sheet can be genuinely useful for quickly reviewing decision criteria the night before your exam.
Domain 6: Safety
Safety
The final domain covers jobsite safety practices specific to commercial roofing work - fall protection, equipment handling, and hazard recognition on both low slope and steep slope surfaces.
- Fall protection systems and anchor point requirements
- Ladder, scaffold, and lift safety on commercial jobsites
- Hazard communication and material handling on roofing projects
- Weather-related jobsite hazards common to Oklahoma conditions
Safety questions tend to be more straightforward than technical assembly questions, but don't treat this domain as a free pass. Missing easy points here for lack of review is one of the most avoidable ways to fall short of the 70% threshold discussed in detail in OK-ROOF Passing Score 2026.
How Domain Weighting Should Drive Your Study Time
With six domains and only 50 scored questions, not every content area carries equal weight. Low Slope Roofing is explicitly the largest domain, which means it's reasonable to expect it to generate more scored questions than any single other area. That doesn't mean you can neglect the other five - General Roofing Knowledge, Architectural Metal Roofing Systems and Sheet Metal Flashing, Moisture and Energy Control, Repairs and Reroofing, and Safety are all independently scored content areas that can sink your result if ignored.
| Domain | Relative Priority | Study Focus |
|---|---|---|
| Low Slope Roofing | Highest - largest domain | Membrane systems, drainage, attachment methods |
| Architectural Metal Roofing Systems and Sheet Metal Flashing | High | Panel systems, flashing fabrication |
| General Roofing Knowledge | Foundational | Terminology, material basics |
| Repairs and Reroofing | Moderate-High | Condition assessment, tear-off vs. overlay |
| Moisture and Energy Control | Moderate | Vapor drive, insulation, energy code |
| Safety | Moderate | Fall protection, hazard recognition |
For a broader look at how domain difficulty compares across the full exam experience, see How Hard Is the OK-ROOF Exam?, which discusses how the domain structure interacts with the 2-hour-30-minute time limit.
Question Format and What "Open Book" Really Means
Every scored item on the commercial roofing technical exam is delivered by computer at a PSI test center. The exam is open book, which changes your prep strategy considerably compared to a closed-book credential - but it doesn't mean you can skip studying. With 50 scored questions to answer in 2 hours 30 minutes, you don't have time to look up every answer from scratch. Open book access is best used to confirm details or check a reference figure, not to learn the material for the first time mid-exam.
You're also permitted a silent, nonprinting, nonprogrammable calculator - useful for drainage calculations, insulation R-value math, and material quantity estimates that may appear within Low Slope Roofing or Moisture and Energy Control questions. PSI may also insert up to 10 unscored experimental questions into your exam; these are indistinguishable from scored items, so answer every question as if it counts, but don't let a strange or unfamiliar question rattle your confidence - it may simply be experimental.
A Domain-by-Domain Study Timeline
Generic study techniques only help if they're mapped to the actual OK-ROOF domain structure. Here's a domain-weighted timeline that allocates the most time to Low Slope Roofing while still giving each domain dedicated review.
Foundations
- Review Domain 1: General Roofing Knowledge terminology and material basics
- Skim the 2025 NRCA Steep Slope manual reference sections relevant to flashing
Low Slope Deep Dive
- Focus the majority of study time on Domain 2: Low Slope Roofing given its size
- Work through membrane types, attachment methods, and drainage design problems
Metal Systems and Moisture Control
- Cover Domain 3: architectural metal panels and sheet metal flashing details
- Study Domain 4 building science concepts: vapor drive and insulation placement
Repairs, Reroofing, and Safety
- Practice Domain 5 scenario questions on tear-off vs. recover decisions
- Finish with Domain 6 safety review, since it's typically faster to master
Full Review
- Take timed practice sessions replicating the 2-hour-30-minute format
- Revisit weak domains identified during practice, prioritizing Low Slope Roofing gaps
For a more detailed walkthrough of pacing, practice question strategy, and how to structure review sessions around your work schedule, see the full OK-ROOF Study Guide 2026. And if you want to stress-test your domain knowledge under realistic timing before test day, our full-length practice tests mirror the six-domain structure covered in this guide.
Why Domain Mastery Connects to Registration and Business Requirements
Passing the domain-based technical exam is only one piece of Oklahoma's commercial endorsement process. You'll also need to hold an Oklahoma roofing registration in good standing, designate an actively engaged qualifying party, register your business with the Secretary of State, and document $1 million in general liability coverage plus workers compensation. A separate 50-question Roofing Business and Law examination is required alongside the technical exam covered in this guide.
On the financial side, initial registration runs $75 and the initial commercial endorsement is $230, with annual renewal set at $75 for registration plus $100 for the endorsement. Starting January 1, 2027, four continuing education hours become an annual requirement for maintaining the commercial endorsement. For the full breakdown of every fee involved, see OK-ROOF Certification Cost 2026, and for eligibility mechanics like the qualifying party requirement, review OK-ROOF Requirements 2026.
Understanding the domains also matters for career planning. Contractors and crews who hold the commercial endorsement are positioned for larger commercial bids that require documented technical competency across low slope, metal, and moisture control systems - a distinction covered further in OK-ROOF Salary Guide 2026 and Is the OK-ROOF Certification Worth It?.
There are six domains: General Roofing Knowledge, Low Slope Roofing, Architectural Metal Roofing Systems and Sheet Metal Flashing, Moisture and Energy Control, Repairs and Reroofing, and Safety.
Low Slope Roofing is the largest domain on the exam, so it should receive the largest share of your study time relative to the other five domains.
Yes. The exam is computer delivered and open book, and candidates may use a silent, nonprinting, nonprogrammable calculator during the test.
No. PSI may include up to 10 unscored experimental questions, and time spent on them does not count against Oklahoma's 2-hour-30-minute limit, but they are not distinguishable from scored items during the exam.
Steep slope is not listed as an independent domain, but current PSI references require the 2025 NRCA Steep Slope manual, and related flashing concepts can appear within domains like Architectural Metal Roofing Systems and Repairs and Reroofing.