2 Layers Of Roof Sheathing

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2 layers of roof sheathing.

Should you sandwich roof sheathing between two impermeable layers. Water shield is the next roofing layer that creates a water proof barrier where ice or water can buildup near the roof eaves. Skinning over old sheathing does occur but i have never seen someone skin over plywood in that condition. It got nailed over 2 x 12 joists 24 o c.

The first course starts with an extra 1 2 wide run. It s up to you. It s usually a peel and stick product that adheres directly to the roof deck. Most roof decking is made from sheets of plywood.

Wood shakes minimum 3 4 sheathing wood shakes nail type minimum length. On a 2 12 pitch roof. So anywhere along the gable end that you can see the felt you ll see two layers. 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.

Poor ventilation from a past roof along with 3 ply equals that delamination. Based on the pictures alone i don t know what to say. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors. I am replacing a roof right now built in 1982 and the 3 ply is delaminated pretty heavily.

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. I m not a fan of spray foam. Most building codes allow for two layers of asphalt shingles on a house so stripping off everything down to the plywood sheathing may not be your only choice. Comes in standard 4 by 8 foot sheets is strong.

Roof deck is the roofing material that sits on top of the roof trusses. 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. 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. Plywood is layers of wood.