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Do metal roofs get installed directly on old roofs or do they put wood strips below the metal for air flow? If you put them over old shingles, does that compromise the energy efficiency or stability? What happens in a hurricane like we just had in Florida? How do they cover the ridge? Herb
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Most systems will have a ridge cap component or some method of closing the ridge. Sometimes a vented ridge will be offered.
As for the wood strips or not ... that varies based upon the product. Find some products you think you mightr like and then contact the manufacturers for details.
10/12/2004
10/12/2004