Polyisocyanurate Insulation In Attic

These facings provide strength improve rigidity and enhance thermal performance.

Polyisocyanurate insulation in attic.

By blocking thermal bridging a polyiso continuous insulation system increases the overall thermal performance of a wall assembly and a building. Polyisocyanurate board insulation is most commonly supplied as 1 2 x 2 4 m or 1 2 x 2 7 m 4 x 8 ft or 4 x 9 ft sheets in various thicknesses. R 6 polyisocyanurate rigid foam insulation board. As a spray foam alternative i m considering using continuous rigid foam along the 32ft long x 7ft slope in my side attic and just spray foaming in the lower joist bays and places where taping is difficult.

Polyisocyanurate insulation costs more than other types of foam board but can help to save you thousands of dollars in electrical heating and cooling costs. A 1 5 inch thick polyiso panel is rated r 9 that s almost double the rating per inch of typical attic insulations. R 13 1 polyisocyanurate rigid foam insulation board. Compressive strength refers to the ability of a rigid foam plastic board to resist deformation and maintain its shape when subjected to a force or load.

I will need 8 of polyiso to meet my disired r value r 48 while keeping the 2x4 rafter bays wide open for. Polyiso foam boards are available in a range of compressive strengths meeting various marketplace requirements. Rmax thermasheath 3 2 in. Polyisocyanurate insulation is a type of insulated foam board that offers a high level of thermal resistance and cold weather protection for your home.

The attics are about as simple as can be with no dormers or other obstructions. Ideally your attic hatch insulation will match roughly the r value of the rest of the attic insulation so the almost double value provides a handy guide to the thickness of your polyisocyanurate insulation.