2 Layers Of Roof Sheathing

I am replacing a roof right now built in 1982 and the 3 ply is delaminated pretty heavily.

2 layers of roof sheathing.

Roof deck is the roofing material that sits on top of the roof trusses. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors. 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. I think there are better ways to design an unvented roof for example by using rigid foam above the roof sheathing instead of closed cell spray foam on the underside of the roof sheathing.

Wood shakes minimum 3 4 sheathing wood shakes nail type minimum length. Most roof decking is made from sheets of plywood. Poor ventilation from a past roof along with 3 ply equals that delamination. Should you sandwich roof sheathing between two impermeable layers.

I m not a fan of spray foam. And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. So anywhere along the gable end that you can see the felt you ll see two layers. If you re in search of quotes for a roof sheathing job improvenet can put you in touch with up to four local contractors for free.

It got nailed over 2 x 12 joists 24 o c. Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course. On a 2 12 pitch roof. Skinning over old sheathing does occur but i have never seen someone skin over plywood in that condition.

Water shield is the next roofing layer that creates a water proof barrier where ice or water can buildup near the roof eaves. Roof sheathing materials plywood. Dimensional comp shingles over 3 tab 1 1 4 1 1 2 1 1 2 1 1 2 more than 1 layer of roofing not recommended over 3 8 sheathing. The first course starts with an extra 1 2 wide run.

Plywood is layers of wood. It s usually a peel and stick product that adheres directly to the roof deck. Can you double up plywood roof sheathing without inviting disaster 2000 sf of 1 2 cdx ply went on the roof before i had a chance to take a look at it and it is really sorry stuff. Based on the pictures alone i don t know what to say.