GAF Cheat Sheet 2026

The 30 highest-yield GAF facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. When attic insulation is installed, what must be maintained between the insulation and the roof deck to ensure proper ventilation? → A minimum 2-inch clear airway channel
2. A GAF-certified contractor discovers mid-project that the existing roof deck has asbestos-containing materials. What is the legally required first step? → Stop work and notify the property owner and relevant environmental authorities
3. A roofing project scope includes removing a suspected asbestos-containing felt underlayment installed before 1980. What is the required risk mitigation step? → Hire an accredited asbestos abatement contractor and follow EPA/NESHAP regulations
4. What does a 'crickets' or 'saddle' installation behind a chimney accomplish in roof design? → Diverts water around the chimney to prevent ponding and leaks
5. What is the purpose of a pre-installation deck inspection in the GAF quality process? → To identify and correct decking deficiencies before new materials are applied
6. Which part of the roof is inspected for proper flashing installation? → Around chimneys and roof joints
7. What is the primary role of a project manager in roofing projects? → To plan, coordinate, and oversee projects
8. A GAF certified contractor is bidding a re-roofing project where the existing system has two layers of shingles. What risk does adding a third layer present? → Excess dead load potentially exceeding structural design limits
9. How should a GAF Certified contractor handle a batch of shingles that arrives with visible manufacturing defects? → Reject the delivery and contact the supplier for replacement before installation begins
10. When installing a GAF ridge vent over a shingle roof, what must be cut along the ridge to allow proper airflow? → A slot through the roof deck on both sides of the ridge
11. A homeowner requests that installation begin one hour earlier than local ordinances permit for noise. The GAF certified contractor should: → Explain the ordinance limits and schedule work within legal hours only
12. Why is proper ventilation important in roofing systems? → To regulate temperature and prevent moisture damage
13. When assessing a roof with multiple layers of shingles, what is the primary concern with adding another layer instead of tearing off existing shingles? → Added weight may exceed the structural load capacity and old layers trap moisture and heat
14. What is the primary reason GAF recommends photographing each phase of installation during a quality audit? → To provide timestamped visual evidence that installation met specifications at each stage
15. When installing laminated (architectural) shingles, why is it important to vary the starting point of each course? → To prevent vertical alignment of joints and water channels
16. Which condition should cause a GAF Certified contractor to stop installation and address the issue immediately? → Discovery of active wood rot in the decking after tear-off begins
17. Under OSHA's heat illness prevention guidelines, when must employers provide shade to outdoor workers in hot weather? → When the heat index exceeds 80°F
18. What is a corrective action in GAF Certified Roofing Contractors quality systems? → A systematic response to eliminate causes of nonconformity and prevent recurrence
19. When performing a structural risk assessment before reroofing, which sign most indicates potential hidden rafter or truss damage? → Visible sagging or waviness in the roof plane
20. What is the primary purpose of the GAF Roofing Academy? → To provide professional training and certification education for roofing contractors
21. Which statistical concept helps roofing researchers determine whether a performance difference between two products is meaningful or due to random chance? → Statistical significance
22. Which GAF certification level is required to offer the System Plus Limited Warranty? → GAF Certified or Master Elite contractors
23. What is the correct procedure when a worker discovers asbestos-containing materials (ACM) on an older roof during a reroof project? → Stop work immediately, secure the area, and notify a licensed abatement contractor
24. What is the correct starter strip installation requirement at the eave before applying the first course of shingles? → Starter strip should overhang the drip edge by 1/4 to 3/8 inch
25. A customer complains that shingle color delivered to the job site does not match the sample they approved. What should the contractor do? → Stop work and contact the supplier to verify batch color before installation
26. During a roof inspection, you notice the shingles are cupping (edges curving upward). What is the most likely cause? → Moisture imbalance between the top and bottom surfaces of the shingle
27. Which of the following best illustrates 'confirmation bias' as a risk in roofing contractor decision-making? → A contractor who only reads testimonials supporting the product they already prefer
28. A GAF Certified contractor discovers that a subcontractor applied incorrect lap widths on the underlayment. What is the best corrective action? → Remove and reinstall the underlayment to meet manufacturer specifications
29. What is the purpose of calculating the 'dead load' in roof system design? → To account for the permanent weight of the roofing materials on the structure
30. What is the minimum toe board height required on a roof scaffold platform to prevent tools and materials from falling on workers below? → 4 inches