Polyisocyanurate Foam Board R Value

Polyisocyanurate polyiso is a closed cell rigid foam board insulation that is bonded to facers on both sides which are composed of various organic and inorganic materials.

Polyisocyanurate foam board r value.

Polyiso has a high r value per inch compared to other insulation products. Some products have reinforced facing to make them sturdier. Choose this option for areas that need a good amount of strength and water resistance. The r value test method and the long term thermal resistance lttr methodol ogy.

Polyiso is used in roof wall ceiling and specialty applications within commercial and residential buildings of all types. See also material data sheet msds 1511 or msds 1911. Polyurethane and polyisocyanurate are both closed cell foams. It provides r values that range from 3 6 to 4 2 per inch.

They contain low conductivity gases in the cells usually one of the hcfc or cfc gases. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. 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. 1 2014 industry issue update polyiso s r value provided an overview of the theory of foam aging.

And nrca s r value recommendations associated with the use of polyisocyanurate insulation used in roof systems. The information on this page is based on data considered to be true and accurate based on periodic internal. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. 2 stated thermal resistance values are based upon conditioning requirements and test methodology found in astm c1289 and astm c518 for foil faced polyisocyanurate insulation.

R matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board composed of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer. This is an even more dense and more expensive foam board insulation. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. It provides about r 5 per inch.

Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. Polyiso is unique in that the r value increases with the thickness of the foam so three inches of polyiso has a higher r value per inch than two inches. This material offers the highest r values about r 6 to 6 5. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are.