Rigid Foam Exterior Roof Sheathing

Featuring integrated moisture air and thermal protection zip system r sheathing completely reimagines traditional wall assemblies by streamlining exterior water air and thermal management.

Rigid foam exterior roof sheathing.

R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. 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 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. Rigid foam insulation also known as insulating boards provide high r values.

Install nailbase for cladding. Rigid insulation is one of the best tools to reduce your energy costs. Here s what you need to know about this growing trend. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.

Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. Rigid foam must be thick enough to prevent condensation on the roof sheathing. We live in zone 5 suburb of chicago and are hopefully about to put rigid foam above the roof sheathing on just the northeast roof portion of our roof. Outsulation is the construction practice of placing a layer of insulation on the exterior side of the building.

Not only that foam sheathing will soon be mandated by code in some climate zones. They keep your home at a comfortable temperature without the need to crank your heat. Install it anywhere from the roof to the foundation. By patrick mccombe issue 273 feb mar 2018 when combining exterior foam insulation with fiberglass cellulose or mineral wool roof insulation the foam layer must be thick enough to keep the sheathing temperature above the dew point.

4 of polyiso under 4 of eps all above the original roof sheathing. 3 benefits of rigid foam sheathing. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Then a second layer of plywood sheathing and asphalt shingles following the steps explained in this article.

The illustration shows two layers of osb or plywood roof sheathing. Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14. The generic term is rigid foam sheathing or rigid foam insulation and it plays a direct role in a building s energy efficiency and performance. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.