Polyiso Roof Insulation R Value Per Inch

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

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

Polyiso roof insulation r value per inch.

Membrane roof systems 2011 and the nrca roofing manual. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Dated its r value recommendations for polyisocyanurate insulation used in roof systems.

Polyiso still remains the highest r value per inch of any available insulation. In the nrca roofing manual. Jm revised lttr values. 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. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. 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.

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. R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2.

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