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It has to be said: Though roof replacement rarely ranks as a "budget" project, it's undoubtedly one of the most important long-term investments you can make toward the continued integrity of your home. A roof with only one layer of shingles can receive a second layer right on top of what's there. If your roof already has two layers of shingles on it, however, the existing layers must be removed before the sheathing can be re-covered with new roofing.
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