Polyiso Roof Insulation R Value Per Inch

High density polyisocyanurate foam core.

Polyiso roof insulation r value per inch.

Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. Closed cell polyisocyanurate foam technology provides additional insulation value r value of 2 5 with lightweight and low water absorption characteristics. 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. 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. 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. Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. Firestone iso 95 gl insulation the highest thermal ratings.

Conditioned per atsm c1289 test method astm c5181 2. Jm revised lttr values. Polyiso still remains the highest r value per inch of any available insulation. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof.

R value chart for enerfoil tm rigid foam faced insulation. 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. Polyiso has a high r value per inch compared to other insulation products.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Thickness inches r value in i p imperial rsi r value in metric 0 5. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. 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. 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.