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. Jm revised lttr values. Building science corporation bsc and others have been examining this difference. 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.

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. 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. It has one of the highest r values per inch of thickness among common insulations.

However labeled r value differs from in service r value for many insulations. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Membrane roof systems 2011 and the nrca roofing manual. Polyiso still remains the highest r value per inch of any available insulation.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation. Let s use the r value of iko s polyiso insulation enerfoil tm as an example.