Polyiso Roof Insulation R Value Per Inch

High density polyisocyanurate foam core.

Polyiso roof insulation r value per inch.

Jm revised lttr values. 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.

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. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. In the nrca roofing manual.

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. Conditioned per atsm c1289 test method astm c5181 2. Benefits of energyguard polyiso roof insulation include. Polyiso still remains the highest r value per inch of any available insulation.

Membrane roof systems 2011 and the nrca roofing manual. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Firestone iso 95 gl insulation the highest thermal ratings.

Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. R value chart for enerfoil tm rigid foam faced insulation. 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. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples.

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.