Polyiso Roof Insulation R Value Per Inch

Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation.

Polyiso roof insulation r value per inch.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Firestone iso 95 gl insulation the highest thermal ratings. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Membrane roof systems 2011 and the nrca roofing manual.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics. 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.

In the nrca roofing manual. Conditioned per atsm c1289 test method astm c5181 2. Not all industry stakeholders are in agreement with the r 6 in. Thickness inches r value in i p imperial rsi r value in metric 0 5.

Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly.

R value chart for enerfoil tm rigid foam faced insulation. Polyiso still remains the highest r value per inch of any available insulation. Jm revised lttr values. 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.

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.