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Polyiso roof insulation r value per inch. As a reasonable estimate of the actual thermal performance of polyisocyanurate insulation over the lifespan of a roof assembly. Polyisocyanurate polyiso iso most often used in roofing applications average cost of 70 per sq. R value chart for enerfoil tm rigid foam faced insulation conditioned per atsm c1289 test method astm c518 1 2. In the nrca roofing manual.
Jm revised lttr values. The increase in thermal resistance for thicker products is due to the reduced contribution of more thermally conductive elements such as the facer and the denser cell structure in the foam near the surface. Polyiso still remains the highest r value per inch of any available insulation. The reflective foil facing makes it an excellent insulation board when radiant heat is involved.
Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Not all industry stakeholders are in agreement with the r 6 in. Keep in mind that polyiso s r value increases with thickness. 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. Since 1987 the national roofing contractor s association nrca has recommended designers use r 5 6 in. Membrane roof systems 2011 and the nrca roofing manual. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior air film again no air movement r 0 68 3 4 of.
Based on consensus standards in both the united states and canada long term thermal resistance lttr is a scientifically supported method to calculate the 15 year time weighted average r value of roof insulation. 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. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation.
For example a two inch polyiso product has more than twice the insulating value than a one inch product. Polyiso has a high r value per inch compared to other insulation products.
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