Polyisocyanurate Roof Insulation R Value Per Inch

Dated its r value recommendations for polyisocyanurate insulation used in roof systems.

Polyisocyanurate roof insulation r value per inch.

Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Jm revised lttr values. Lttr value published by polyisocyanurate insulation manufacturers for 1 and 1 5 inch thick samples. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.

Membrane roof systems 2011 and the nrca roofing manual. R 6 polyisocyanurate rigid foam insulation board. 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.

This allows polyiso products to deliver more energy savings potential for buildings than other materials of the same thickness. Polyiso still remains the highest r value per inch of any available insulation. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Polyiso has a high r value per inch when compared to other insulation products see chart below.

Not all industry stakeholders are in agreement with the r 6 in. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. R5 radiant acoustic insulation kit stc 19 5 piece price. 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.

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. Firestone iso 95 gl insulation the highest thermal ratings. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. In the nrca roofing manual.

Rmax thermasheath 3 2 in. Benefits of energyguard polyiso roof insulation include. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. 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.