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A We do not recommend this: 1. Your shingle roof will not last as long. 2. If you develop a leak it is very difficult to find and repair. 3. You will pay more in the future when it needs replacement (codes allows two layers only). 4. We find more decayed wood when there are two layers of roofing.
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Is roofing over (two layers of roofing) a good idea?
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