Polyiso Roof Insulation R Value Per Inch

Polyiso has a high r value per inch compared to other insulation products. Because it s highly energy efficient with the highest r value ratings per inch the use of iso 95 gl insulation in a firestone roofing system provides a cost effective solution for today s oof design r challenges and is preferred for any and every roofing system. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program.

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Thickness inches r value in i p imperial rsi r value in metric 0 5.

Polyiso roof insulation r value per inch.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. 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. R value chart for enerfoil tm rigid foam faced insulation.

Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics. 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. Conditioned per atsm c1289 test method astm c5181 2.

Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. 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. Not all industry stakeholders are in agreement with the r 6 in. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Firestone iso 95 gl insulation the highest thermal ratings. In the nrca roofing manual. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples.

High density polyisocyanurate foam core. Jm revised lttr values. Benefits of energyguard polyiso roof insulation include. Membrane roof systems 2011 and the nrca roofing manual.

Polyiso still remains the highest r value per inch of any available insulation.

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