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Would you recommend installing an asphalt roof over two existing layers of shingles?

In some cases
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Question: Would you recommend installing an asphalt roof over two existing layers of shingles?
Top Answer (77% of 27 votes): Never.

Answer: Never
Explanation: NO NO and NO
Answer: Never
Explanation: Code does not allow more than two layers.
J. Edmund Construction
Answer: Never
Explanation: two layers is the max so if you have too roofs already and want a new roof you must tear off and go from there
all-phaze handyman & TV install
Answer: Never
Explanation: We will not do this as when you read the fine print there is no shingle manufacturer warranty, and from an install stand point we are unable to change out flashings, install ice and water shield, and replace any bad wood when a "go over" is done. We strongly suggest against this
American roofing &remodeling
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