Polyisocyanurate Roof Insulation R Value Per Inch

Polyiso still remains the highest r value per inch of any available insulation.

Polyisocyanurate roof insulation r value per inch. 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. Jm revised lttr values. Let s use the r value of iko s polyiso insulation enerfoil tm as an example.

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. R value per inch comparison polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation. 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. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. Rmax thermasheath 3 1 in. R 13 1 polyisocyanurate rigid foam insulation board.

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. R5 radiant acoustic insulation kit stc 19 5 piece price. Firestone iso 95 gl insulation the highest thermal ratings.

This allows polyiso products to deliver more energy savings potential for buildings than other materials of the same thickness. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. In the nrca roofing manual. Rmax thermasheath 3 2 in.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Polyiso has a high r value per inch when compared to other insulation products see chart below. Membrane roof systems 2011 and the nrca roofing manual.