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.

However labeled r value differs from in service r value for many insulations. R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2. Membrane roof systems 2011 and the nrca roofing manual. It has one of the highest r values per inch of thickness among common insulations.

Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Benefits of energyguard polyiso roof insulation include. Jm revised lttr values. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Building science corporation bsc and others have been examining this difference. In the nrca roofing manual. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation.

Polyiso still remains the highest r value per inch of any available insulation. 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. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products.