When installing composition shingles on a roof with a 3:12 slope in California, what type of underlayment is required by the California Residential Code?
Correct Answer
B) Two layers of 15-pound felt
California Residential Code Section R905.2.7 requires two layers of underlayment cemented together for asphalt shingle application on roof slopes between 2:12 and 4:12. This provides additional water protection for low-slope applications where water movement is slower and potential for infiltration is higher.
Why This Is the Correct Answer
California Residential Code Section R905.2.7 requires two layers of underlayment cemented together for asphalt shingle application on roof slopes between 2:12 and 4:12. This provides additional water protection for low-slope applications where water movement is slower and potential for infiltration is higher.
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In California Wildland-Urban Interface (WUI) areas designated as Very High Fire Hazard Severity Zones, what type of roof covering is required under CBC Chapter 7A?