- Understanding the ASSI Exam Domain Structure
- Domain 1: Project Safety (16%)
- Domain 2: General Work Practices and Communication (6%)
- Domain 3: Tools and Equipment (6%)
- Domain 4: System Materials (5%)
- Domain 5: Materials Installation (43%)
- Domain 6: Flashings and Accessories (19%)
- Domain 7: Job-site Housekeeping (5%)
- Mapping Domains to a Study Schedule
- Frequently Asked Questions
- Materials Installation is worth 43% of the eligibility exam - nearly half your score depends on it.
- Flashings and Accessories (19%) and Project Safety (16%) round out the three heaviest domains.
- The eligibility exam has 60 multiple-choice questions with a one-hour limit and unlimited retakes.
- Domain weights come from NRCA's currently linked 2020 Steep-slope eligibility outline, not a shingle-only breakdown.
Understanding the ASSI Exam Domain Structure
The NRCA PROCertified Asphalt Shingle Systems Installer (ASSI) credential is built around a two-part evaluation: the required Steep-slope Roof Systems Eligibility Exam, and a separate asphalt-shingle hands-on skills assessment that follows once you pass. This guide focuses on the seven content domains that shape the written eligibility exam - the gatekeeper you must clear before an assessor ever looks at your fieldwork.
The eligibility exam is delivered online with 60 multiple-choice questions and a one-hour maximum. It's available in English and Spanish, includes optional audio, gives immediate feedback, and allows unlimited attempts. Access is free for both members and nonmembers, and a passing result stays valid for 12 months - long enough to schedule your practical assessment without rushing.
It's worth noting that the domain weights below reflect the approximate proportions in NRCA's currently linked 2020 Steep-slope eligibility outline. That outline covers general steep-slope roofing knowledge broadly, not an asphalt-shingle-only breakdown, and it is distinct from the separate job task analysis or practical rubric used for the hands-on assessment. If you want the full picture of how domain content connects to scoring thresholds, pair this article with our ASSI Passing Score guide and the complete domains overview.
Domain 1: Project Safety (16%)
Project Safety
As the second-largest domain, Project Safety tests whether you understand jobsite hazards specific to steep-slope roofing - fall protection, ladder setup, and hazard recognition before work begins. Given the physical risk profile of shingle installation, expect questions that combine regulatory knowledge with practical judgment calls.
- Fall protection systems and anchor point selection for steep-slope work
- Ladder and scaffold setup, inspection, and safe usage practices
- Personal protective equipment appropriate to roofing tasks
- Recognizing and responding to weather-related and structural hazards
Because safety questions often describe a scenario rather than ask a direct definition, candidates who've only memorized terms tend to struggle here. If you're unsure how scenario-based questions differ from straightforward recall, our difficulty guide breaks down the exam's question style in more depth.
Domain 2: General Work Practices and Communication (6%)
General Work Practices and Communication
This domain covers the professional and procedural side of the job - how installers communicate with crews, supervisors, and clients, along with general workmanship expectations that apply across roofing tasks.
- Clear communication protocols between crew members and supervisors
- Documentation habits and reporting job progress or issues
- General conduct and professionalism expectations on a job site
At 6% of the exam, this domain won't make or break your score on its own, but it's an easy set of points to secure with modest review time.
Domain 3: Tools and Equipment (6%)
Tools and Equipment
This domain checks your familiarity with the tools installers rely on daily - from hand tools to power equipment used in cutting, fastening, and measuring shingle systems.
- Proper selection and use of roofing hand tools and pneumatic nailers
- Measuring and cutting tools for accurate shingle layout
- Basic maintenance and safe handling of jobsite equipment
Because this domain is another 6% slice, it's a good candidate for a quick review pass rather than deep study time - a distinction covered more fully in our ASSI Study Guide.
Domain 4: System Materials (5%)
System Materials
System Materials tests your knowledge of the components that make up a complete asphalt shingle roofing system, beyond the shingles themselves.
- Underlayment types and their appropriate applications
- Shingle types, profiles, and manufacturer specifications
- Fasteners, adhesives, and sealants used within shingle systems
At only 5% of the exam, this is one of the smaller domains - but the material knowledge here directly supports the much larger Materials Installation domain below, so don't skip it entirely.
Domain 5: Materials Installation (43%)
Materials Installation
This domain is the backbone of the entire eligibility exam, and it aligns directly with the hands-on skills that the practical assessment later verifies with a Qualified Assessor. Expect deep coverage of correct installation sequencing, exposure and offset patterns, and manufacturer-specified techniques for asphalt shingle systems.
- Proper shingle layout, exposure, and course alignment
- Nailing patterns, fastener placement, and fastening schedules
- Starter course and hip/ridge installation techniques
- Manufacturer specifications and how they govern installation decisions
- Ventilation considerations tied to overall system installation
Given its weight, this domain should anchor your entire preparation strategy. If you're building a study plan, the amount of time devoted to Materials Installation should be roughly proportional to its 43% share - far more than any other domain receives. Our ASSI Cheat Sheet is designed to help you drill this domain's high-frequency concepts quickly.
Key Takeaway
Spend the majority of your study hours on Materials Installation. Since it's tied to real hands-on technique, reviewing manufacturer installation instructions alongside the written material reinforces both the eligibility exam and the later practical assessment.
Domain 6: Flashings and Accessories (19%)
Flashings and Accessories
Flashings and Accessories is the second-heaviest domain, and it maps directly onto NRCA's eligibility requirement that candidates have hands-on experience with flashings and valleys specifically. Expect this domain to test the trickiest transition points on a shingle roof - the places most prone to leaks if installed incorrectly.
- Valley flashing methods (open, closed, and woven approaches)
- Step flashing at walls, chimneys, and other vertical penetrations
- Drip edge, pipe boots, and other roof accessories
- Proper sequencing of flashing installation relative to shingle courses
Because flashing knowledge is explicitly tied to the eligibility requirement - you need experience that includes flashings and valleys - this domain rewards candidates who've actually performed this work in the field, not just studied it. See our ASSI Requirements guide for how field experience and exam content connect.
Domain 7: Job-site Housekeeping (5%)
Job-site Housekeeping
The final domain, tied with System Materials at 5%, covers the practices that keep a roofing job site clean, organized, and hazard-free once work is underway.
- Debris management and disposal during and after installation
- Material storage and staging practices on active roofs
- Site cleanup procedures that reduce liability and hazard risk
Small in weight but low-effort to master, this domain is a reliable place to pick up easy points late in your review.
| Domain | Weight | Approx. Questions (of 60) |
|---|---|---|
| Materials Installation | 43% | ~26 |
| Flashings and Accessories | 19% | ~11 |
| Project Safety | 16% | ~10 |
| General Work Practices and Communication | 6% | ~4 |
| Tools and Equipment | 6% | ~4 |
| System Materials | 5% | ~3 |
| Job-site Housekeeping | 5% | ~3 |
Mapping Domains to a Study Schedule
Rather than studying all seven domains equally, allocate your time in proportion to their weight. A simple four-week structure built around the domain percentages looks like this:
Materials Installation Deep Dive
- Review shingle exposure, nailing patterns, and course alignment
- Study manufacturer installation specifications
- Take practice questions focused on the 43% domain
Flashings, Accessories, and Safety
- Work through valley and step flashing scenarios
- Review fall protection and ladder safety practices
- Cross-reference field experience with exam concepts
Smaller Domains and Reinforcement
- Cover Tools and Equipment, System Materials, and Communication
- Add Job-site Housekeeping as a quick final review
- Re-test weaker areas from Weeks 1-2
Full Practice and Timing
- Take full-length timed practice runs at the one-hour limit
- Review missed questions by domain, not just overall score
- Confirm employer validation and experience documentation are ready
For a more detailed walkthrough of preparation strategy, see our ASSI Study Guide, and use our practice test platform to simulate the 60-question, one-hour format before test day.
Frequently Asked Questions
There are seven domains: Project Safety, General Work Practices and Communication, Tools and Equipment, System Materials, Materials Installation, Flashings and Accessories, and Job-site Housekeeping.
Materials Installation, at 43% of the exam, deserves the largest share of your study time, followed by Flashings and Accessories (19%) and Project Safety (16%).
No. These weights come from NRCA's currently linked 2020 Steep-slope eligibility outline and apply to the written eligibility exam. The separate asphalt-shingle job task analysis and practical assessment use their own evaluation criteria, scored pass/fail by a Qualified Assessor.
No. Passing the eligibility exam (valid for 12 months) qualifies you to move on to the separate hands-on skills assessment, which must be completed within 12 months of application approval, with one retake allowed if needed.
NRCA publishes the Steep-slope exam outline directly on its website alongside the installer quick start guide and FAQs. Our ASSI Certification overview links to related resources and next steps.