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Polyisocyanurate roof insulation r value per inch. Polyisocyanurate rigid insulation isocyanurate or iso is the most commonly used flat roof insulation and can be used in any type of flat roof system isocyanurate rigid insulation has the highest r value of any insulation product with an r value of 6 0 per inch. It has one of the highest r values per inch of thickness among common insulations. Polyiso has a high r value per inch compared to other insulation products. Polyisocyanurate insulation is a common commercial and residential roof and wall insulation.
Jm suggests that design professionals use 5 7 r inch as a design specification for its foam products. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. In the nrca roofing manual.
Membrane roof systems 2011 and the nrca roofing manual. 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. However labeled r value differs from in service r value for many insulations.
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.
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