Polyiso Insulation R Value Per Inch

With the publication of this interim update nrca has revised its design in service r value rec ommendation to 5 0 per inch thickness in all climate conditions.

Polyiso insulation r value per inch.

Does not melt when exposed to flame versus other types of rigid foam board astm e84 the low permeability of foil facing coupled with polyiso s high thermal performance make it ideal for controlling condensation in walls. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. This month nrca has revised and updated its recommen. An exclusive third party thermal performance certification.

However labeled r value differs from in service r value for many insulations. It has one of the highest r values per inch of thickness among common insulations. 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. Polyiso still remains the highest r value per inch of any available insulation.

Building science corporation bsc and others have been examining this difference. Outstanding installed cost advantages and economical cost per r value. This highly effective combination of materials offers a higher r value per inch compared to traditional flat sheet rigid foam insulation. And the change in lttr values effective january 1 2014.

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Polyiso has a high r value per inch compared to other insulation products. R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2. The increase in thermal resistance for thicker products is due to the reduced contribution of more thermally conductive elements such as the facer and the denser cell.

Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation. For example a two inch polyiso product has more than twice the insulating value than a one inch product. Keep in mind that polyiso s r value increases with thickness.

Polyiso has the highest r value per inch of any rigid board insulation. In service r values of 5 0 per inch thickness in predominant. Of polyisocyanurate insulation used in roof systems. A high r value per inch compared to other insulation products used in commercial and residential construction.