Roof Sailing Knowledge 4 — Questions and Answers
Question 1: What OSHA regulation governs fall protection requirements for residential roofing work?
- 29 CFR 1910.23
- 29 CFR 1926.502 (Correct answer)
- 29 CFR 1904.39
- 29 CFR 1910.147
Correct answer: 29 CFR 1926.502
29 CFR 1926.502 outlines fall protection systems criteria and practices for residential and commercial construction, including roofing.
Question 2: At what roof height does OSHA generally require fall protection measures for residential construction?
- 4 feet
- 6 feet (Correct answer)
- 10 feet
- 15 feet
Correct answer: 6 feet
OSHA requires fall protection when workers are exposed to a fall of 6 feet or more in residential construction environments.
Question 3: Which defect in asphalt shingles is characterized by individual tabs curling upward at their edges?
- Blistering
- Cupping (Correct answer)
- Clawing
- Granule loss
Correct answer: Cupping
Cupping occurs when shingle tabs curl upward at the edges, often caused by moisture imbalance or poor ventilation below the deck.
Question 4: What is the purpose of counter flashing installed over base flashing at a chimney?
- To add a second waterproof membrane under the shingles
- To allow thermal movement while keeping the junction sealed (Correct answer)
- To reinforce the mortar joints on the chimney face
- To redirect wind away from the flue opening
Correct answer: To allow thermal movement while keeping the junction sealed
Counter flashing is embedded in the chimney mortar and overlaps the base flashing, allowing both components to move independently with thermal expansion.
Question 5: Which type of nail is recommended for attaching asphalt shingles to minimize corrosion?
- Bright common nails
- Electro-galvanized roofing nails
- Hot-dipped galvanized or stainless steel roofing nails (Correct answer)
- Aluminum finish nails
Correct answer: Hot-dipped galvanized or stainless steel roofing nails
Hot-dipped galvanized or stainless steel roofing nails provide the most durable corrosion resistance for long-term shingle attachment.
Question 6: What does the term 'low-slope roof' typically refer to in residential roofing?
- Any roof with a pitch greater than 6:12
- A roof with a pitch between 2:12 and 4:12 (Correct answer)
- A completely flat roof with no slope
- A roof pitched less than 1:12
Correct answer: A roof with a pitch between 2:12 and 4:12
Low-slope roofs typically have pitches between 2:12 and 4:12, requiring special waterproofing methods because water drains slowly.
Question 7: When calculating the total square footage of a gable roof, which factor accounts for the actual surface area versus the footprint?
- Waste factor
- Slope multiplier (Correct answer)
- Nail factor
- Exposure factor
Correct answer: Slope multiplier
A slope multiplier is applied to the building's footprint to calculate the actual inclined roof surface area, which increases with steeper pitches.
Roof Sailing Knowledge 4
What OSHA regulation governs fall protection requirements for residential roofing work?