New Roof Sheathing Over Old

Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.

New roof sheathing over old.

Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage. That must always be accounted for in the roofing design process. The new plywood thickness should be. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.

Has the same manufacturer s warranty. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. The existing asphalt shingles need replacement so he plans to do a tear off and re shingle. Find a pre screened local roofing contractor.

Construction of a new roof deck for asphalt fiberglass roofing if you re going to add a roof on top of an old one it s a good idea to remove any loose shingles and apply a new layer of 30 pound roofing felt before laying the new shingles. But you must take care to install shingles correctly so they lie flat. Looks just as good and lasts as long. Answered 6 years ago by wowhomesolutions.

As long as it s done right and under the right conditions installing new shingles over old ones can last as long and look just as good as a complete re roof. Roy gingrich of ellicott city has a 40 year old house with an asphalt shingle roof surface. That s also why building codes commonly limit re roofing to no more than two layers. Installing a new roof over shingles takes less time than tearing off the old roof.