Polyiso Roof Insulation R Value Per Inch

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation. Jm revised lttr values.

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Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Polyiso roof insulation r value per inch.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. 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. Building science corporation bsc and others have been examining this difference. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products.

Benefits of energyguard polyiso roof insulation include. 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. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. It has one of the highest r values per inch of thickness among common insulations.

Polyiso has a high r value per inch compared to other insulation 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. Membrane roof systems 2011 and the nrca roofing manual.

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

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