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.

New roof sheathing over old.

Find a pre screened local roofing contractor. Going over inadequate thickness plywood for a more solid deck or skip sheathing is fine as long as they pay special note to the ventilation and home the roof is designed to vent. Has the same manufacturer s warranty. The new plywood thickness should be.

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. The existing asphalt shingles need replacement so he plans to do a tear off and re shingle. That must always be accounted for in the roofing design process. 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.

If your roof is in good shape but has some damage to one side from a downed tree or has lost shingles in a wind storm an overlay is worth considering. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. Installing a new roof over shingles takes less time than tearing off the old roof. Answered 6 years ago by wowhomesolutions.

But you must take care to install shingles correctly so they lie flat. That s also why building codes commonly limit re roofing to no more than two layers. Looks just as good and lasts as long. 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.