Polyisocyanurate Roof Insulation R Value Per Inch

Rmax thermasheath 3 1 in.

Polyisocyanurate roof insulation r value per inch.

Polyiso has a high r value per inch compared to other insulation products. Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Rmax thermasheath 3 2 in. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. R 6 polyisocyanurate rigid foam insulation board. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Membrane roof systems 2011 and the nrca roofing manual.

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Polyiso still remains the highest r value per inch of any available insulation. In the nrca roofing manual. Polyiso has a high r value per inch when compared to other insulation products see chart below.

Dated its r value recommendations for polyisocyanurate insulation used in roof systems. 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. Benefits of energyguard polyiso roof insulation include. Firestone iso 95 gl insulation the highest thermal ratings.

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. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. R 13 1 polyisocyanurate rigid foam insulation board. This allows polyiso products to deliver more energy savings potential for buildings than other materials of the same thickness.

R value per inch comparison polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. 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. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. Jm revised lttr values.