Polyiso Roof Insulation R Value Per Inch

Polyiso has a high r value per inch compared to other insulation products.

Polyiso roof insulation r value per inch.

R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2. In the nrca roofing manual. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program.

Fm approved subject to the conditions of approval as a roof insulation when installed as shown in the current edition of the factory mutual research approvals guide. Benefits of energyguard polyiso roof insulation include. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Jm revised lttr values. Building science corporation bsc and others have been examining this difference. Membrane roof systems 2011 and the nrca roofing manual.

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. However labeled r value differs from in service r value for many insulations.