Roofing: Can I install new shingles over my existing shingles?

While you might think that this will save you money in the short term it will not serve you well in the long term. The life expectancy of your new shingles will be shortened if installed over top of existing shingles. You will not have had the opportunity to inspect the decking underneath the old shingles and replace any rotten wood if required. Cosmetically the underlying shingles will telegraph through the new shingles and be somewhat visible. As a general rule installing new shingles over top of existing shingles is not recommended.

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