CSLB C-39 Roofing ContractorSteep-Slope RoofingHard
A roofing crew is installing 16-inch wood shakes on a roof with a 7:12 slope. They are using a standard single-coverage application. What is the maximum exposure that should be used for these shakes?
- A5.5 inches
- B7 inches
- C5 inches
- D6 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 7 inches
For 16-inch wood shakes installed in a single-coverage application, the maximum exposure is typically 7 inches. This provides a 9-inch headlap (16-inch shake length - 7-inch exposure = 9-inch headlap), ensuring three layers of material over the entire roof and proper water shedding.
Why the other options are wrong
- A. 5.5 inches exposure is incorrect for 16-inch shakes in single coverage.
- C. 5 inches exposure would result in an excessive headlap (11 inches), reducing material efficiency.
- D. 6 inches exposure would result in a 10-inch headlap, which is more overlap than necessary for single coverage.
Wood Shake Exposure (Single Coverage)
The exposed portion of a wood shake when installed in a single-coverage application, ensuring three layers of material.
- Calculated to achieve 3-ply coverage.
- Varies by shake length.
- Different from double-coverage exposure.
Memory trick: Single coverage, three layers strong, seven inches for a 16-inch song.