GAF Risk Assessment & Mitigation 2 — Questions and Answers
Question 1: A roofing crew is working on a steep-slope roof with a pitch greater than 6:12. Which fall protection method is MOST appropriate under OSHA regulations?
- Warning line system alone
- Personal fall arrest system (PFAS) (Correct answer)
- Safety monitor system alone
- Toe boards only
Correct answer: Personal fall arrest system (PFAS)
OSHA requires personal fall arrest systems, guardrails, or safety nets on steep-slope roofs; a warning line or safety monitor alone does not satisfy requirements above 6:12 pitch.
Question 2: When assessing wind uplift risk for a GAF certified installation, which roof zone experiences the highest uplift pressures?
- Field (center) zone
- Ridge zone
- Corner zones (Correct answer)
- Eave zone
Correct answer: Corner zones
Corner zones experience the greatest wind uplift pressures due to aerodynamic effects, requiring enhanced fastening patterns per FM Global or ASCE 7 standards.
Question 3: A contractor discovers existing roof decking with a moisture content above 19% before installing GAF shingles. What is the correct risk mitigation step?
- Install shingles immediately to seal moisture in
- Replace or allow decking to dry to acceptable moisture levels (Correct answer)
- Apply extra adhesive strips to compensate
- Proceed if only isolated areas are affected
Correct answer: Replace or allow decking to dry to acceptable moisture levels
Wet or high-moisture decking causes fastener pull-through, mold growth, and premature shingle failure, so it must be replaced or dried before installation.
Question 4: Which document should a GAF certified contractor review FIRST when evaluating fire risk for a roofing project near a wildland-urban interface (WUI)?
- Local building code and fire rating requirements (Correct answer)
- Manufacturer color chart
- HOA aesthetic guidelines
- OSHA 1926 subpart Q
Correct answer: Local building code and fire rating requirements
Local building codes and fire rating requirements (often Class A minimum in WUI zones) govern which roofing systems are permissible in fire-prone areas.
Question 5: During a pre-job site assessment, a contractor notices overhead power lines within 10 feet of the work area. The BEST risk mitigation action is to:
- Proceed cautiously using non-conductive ladders only
- Contact the utility company to de-energize or guard lines before work begins (Correct answer)
- Assign a spotter to warn workers
- Limit tool use to hand tools only
Correct answer: Contact the utility company to de-energize or guard lines before work begins
OSHA requires contacting the utility to de-energize or install protective insulation before working within the minimum approach distance of energized power lines.
Question 6: 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?
- Improved thermal performance
- Excess dead load potentially exceeding structural design limits (Correct answer)
- Better wind resistance due to added weight
- Simplified installation process
Correct answer: Excess dead load potentially exceeding structural design limits
Most building codes prohibit more than two layers of asphalt shingles because the added dead load can exceed the structural capacity of the roof deck and framing.
Question 7: Which condition on a job site most directly increases the risk of heat-related illness for roofing crews during summer installations?
- Low relative humidity below 20%
- Working on dark-colored surfaces in direct sunlight with high humidity (Correct answer)
- Wind speeds above 15 mph
- Early morning start times
Correct answer: Working on dark-colored surfaces in direct sunlight with high humidity
Dark roof surfaces can reach 150°F+ and high humidity impairs the body's cooling mechanism, dramatically increasing heat stroke risk for roofing workers.
GAF Risk Assessment & Mitigation 2
A roofing crew is working on a steep-slope roof with a pitch greater than 6:12.
Which fall protection method is MOST appropriate under OSHA regulations?