Polyiso Roof Insulation R Value Per Inch

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

Polyiso roof insulation r value per inch.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. 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. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in.

In the nrca roofing manual. Polyiso has a high r value per inch compared to other insulation products. Membrane roof systems 2011 and the nrca roofing manual. Firestone iso 95 gl insulation the highest thermal ratings.

High density polyisocyanurate foam core. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. 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. 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.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Not all industry stakeholders are in agreement with the r 6 in. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. 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.

As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. 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.

Jm revised lttr values. Benefits of energyguard polyiso roof insulation include. Conditioned per atsm c1289 test method astm c5181 2.