Roof with three layers of shingles - dangerous?
Ben,
Shingles have weight. Each layer of shingles puts weight on your roof
structure. This structure must support this weight and the weight of other
things (snow and ice come to mind). 3 layers of shingles may be too much
weight for your roof structure.I 'd be concerned about the roof collapsing.
I'd really worry come Winter.
Dave M.
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