Thread: Roof with three layers of shingles - dangerous?
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Phisherman Phisherman is offline
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Default Roof with three layers of shingles - dangerous?
Having just one and only one layer is best. Shingles are heavy and
can put extra stress on a roof. I've seen some really bad sagging
roofs with 2,3 and 4 layers of shingles on it.
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