Siding manufacturers specify a clearance to asphalt shingles and flat roofs to avoid moisture damage. Why did they establish this requirement? Minimum Clearance First, there are basics to look for with roof/siding clearance (Illustration R075). In all cases, there must be some clearance between asphalt shingles and the siding and trim on a vertical wall abutting the shingles. The clearance allows water to drain out of the siding assembly and freely run down the roof. The clearance requirement varies with the type of material and manufacturer. Illustration ...
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