New Roof Sheathing Over Old

That s also why building codes commonly limit re roofing to no more than two layers.

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. Has the same manufacturer s warranty. As long as the new plywood itself can span the distance and carry the roof wind seismic and snow loads for your region adding new ply over old is just fine. Answered 6 years ago by wowhomesolutions.

The new plywood thickness should be. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. 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. Looks just as good and lasts as long.

Roy gingrich of ellicott city has a 40 year old house with an asphalt shingle roof surface. But you must take care to install shingles correctly so they lie flat. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. That must always be accounted for in the roofing design process.

Find a pre screened local roofing contractor. 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. Installing a new roof over shingles takes less time than tearing off the old roof. The existing asphalt shingles need replacement so he plans to do a tear off and re shingle.