2 Layers Of Roof Sheathing

This old house general contractor tom silva prefers this route even when the roof is just a single layer so he can find the source of any water damage upgrade the flashing and install.

2 layers of roof sheathing. Based on the pictures alone i don t know what to say. The illustration shows two layers of osb or plywood roof sheathing. It s up to you. Comes in standard 4 by 8 foot sheets is strong.

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 m not a fan of spray foam. Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation.

Plywood is layers of wood. Poor ventilation from a past roof along with 3 ply equals that delamination. The exposed edges of the 3 layers of rigid insulation are no longer exposed. It got nailed over 2 x 12 joists 24 o c.

Skinning over old sheathing does occur but i have never seen someone skin over plywood in that condition. On a 2 12 pitch roof. 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. A lower layer conventionally nailed to the rafters and an upper layer installed as a nailing surface for the roofing material on top of the rigid foam.

More expensive because of the additional labor and materials peeling off the old roof down to the sheathing is your only option if you already have two layers. And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. The type of fasteners used and the way they need to be spaced for the top layer of sheathing depend on the pitch of the roof. Should you sandwich roof sheathing between two impermeable 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. I italicized atop because on very low slope roofs some shingle installation applications specify interlaying a course of felt underlayment perhaps using 30 felt between every shingle course as part of.