Yes, roofing over existing shingles is possible, though not recommended. This process is less costly than stripping old roof shingles and installing new ones. It is also easier to do. In order to successfully install shingles over preexisting shingles, a few conditions apply.
Roofing Over Existing Shingles
1. The old shingles must be flat and only one layer can preexist. The existing layer should also be in good condition, though this is not absolutely necessary. You can add a layer of waterproof shingle under-layment on top of the existing shingles to reinforce the protection and prevent leaks.
2. If there are broken or torn shingles, glue the tear together or cut a piece to fit. Use roofing cement to adhere the shingles. You must ensure that there is a flat surface with minimal gaps.
3. You will also want to clean your roof of any twigs or debris that could disrupt the flatness of the existing layer or the adherence of the new shingles. Use a broom to knock off any debris.
4. Proper installation is key. Make sure the second layer of roof shingles is correctly installed in order to prevent any future damage. Have a professional roofing contractor determine if the conditions of your existing roof shingle are suitable for a second layer.
It is better to NOT layer shingles because the gaps created between the old shingles and the new shingles makes your roof more susceptible to weather. It will be harder to determine the location of a leak if you layer roof shingles. Plus, new roof shingle installation means you can put down a new water and ice shield. It is better to be safe than sorry when it comes to your home.
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