When installing step flashing along a roof-to-wall intersection in California, what is the minimum overlap requirement for each piece of step flashing?
Correct Answer
C) 3 inches minimum overlap
CRC Section R903.2.1 requires step flashing to overlap a minimum of 3 inches. Each piece of step flashing must overlap the next lower piece by at least 3 inches to ensure continuous water protection. This overlapping pattern prevents water infiltration at the critical roof-to-wall intersection, which is essential in California's seismic environment where building movement can compromise flashing integrity.
Why This Is the Correct Answer
CRC Section R903.2.1 requires step flashing to overlap a minimum of 3 inches. Each piece of step flashing must overlap the next lower piece by at least 3 inches to ensure continuous water protection. This overlapping pattern prevents water infiltration at the critical roof-to-wall intersection, which is essential in California's seismic environment where building movement can compromise flashing integrity.
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