Polyiso Roof Insulation R Value Per Inch

Building science corporation bsc and others have been examining this difference.

Polyiso roof insulation r value per inch.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Jm revised lttr values. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation. Membrane roof systems 2011 and the nrca roofing manual.

Benefits of energyguard polyiso roof insulation include. In the nrca roofing manual. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Polyiso has a high r value per inch compared to other insulation products.

It has one of the highest r values per inch of thickness among common insulations. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. 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. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.

Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2.