New Roof Sheathing Over Old

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.

New roof sheathing over old.

But you must take care to install shingles correctly so they lie flat. 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. 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. The new plywood thickness should be.

Installing a new roof over shingles takes less time than tearing off the old roof. Answered 6 years ago by wowhomesolutions. 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. That s also why building codes commonly limit re roofing to no more than two layers.

That must always be accounted for in the roofing design process. Looks just as good and lasts as long. Has the same manufacturer s warranty. The existing asphalt shingles need replacement so he plans to do a tear off and re shingle.

If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. 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. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. Find a pre screened local roofing contractor.