Rigid Insulation Over Plywood Sheathing

An additional layer of 1 2 plywood is proposed above the rigid insulation for attachment of asphalt shingles.

Rigid insulation over plywood sheathing.

It s made up of several thin layers of wood or plys which are laid in opposite directions to one another. Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. Forming plywood medium density overlay plywood. It adds up to a robust system.

Cladding attachment over thick exterior rigid insulation background current building code does provide prescriptive means to attach cladding over exterior insulation table r704 3 note v. 3 benefits of rigid foam sheathing. Osb sheathing tyvek house wrap 1 xps with taped seams vinyl siding my builder was going to put the xps foam directly over the sheathing and then was going to wrap the house over the top of the foam. The exposed edges of the 3 layers of rigid insulation are to be sealed with another layer of membrane.

More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e. Plywood is a frequently used material for external structural sheathing. The exposed edges of the 3. We have a project that will have 1 1 2 rigid insulation installed above the 5 8 structural roof sheathing.

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. The foam on the outside keeps the wood frame inside the. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. I just saw a video from dupont that this is how they recommend the installation goes.

This creates a much more stable and structurally sound sheath that can be used over the exterior. Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management. Current pneumatic nailers have maximum fastener lengths. Plywood sheathing image credit.