Polyiso Roof Insulation R Value Per Inch

Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products.

Polyiso roof insulation r value per inch.

Jm revised lttr values. Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics. Polyiso still remains the highest r value per inch of any available insulation.

Firestone iso 95 gl insulation the highest thermal ratings. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. 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.

Benefits of energyguard polyiso roof insulation include. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.

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. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. High density polyisocyanurate foam core.

Polyiso has a high r value per inch compared to other insulation products. Membrane roof systems 2011 and the nrca roofing manual. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. Thickness inches r value in i p imperial rsi r value in metric 0 5.

Not all industry stakeholders are in agreement with the r 6 in.