Polyiso Roof Insulation R Values

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Polyiso roof insulation r values.

Polyiso still remains the highest r value per inch of any available insulation. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. At one inch thickness enerfoil tm achieves a 6 2 r value or a 1 08 rsi. Jm revised lttr values jm suggests that design professionals use 5 7 r inchas a design specification for its foam products.

To compare different insulation products researchers have to create the exact same conditions and then measure how well the insulation performs. Polyiso has a high r value per inch compared to other insulation products. Measuring the r value of polyiso roof insulation at the website of pima polyisocyanurate insulation manufacturers association discusses long term thermal resistance lttr the astm standards underlying the r values for polyisocyanurate insulation and provides r values for various thicknesses of polyiso which increases in r value per inch as total thickness of the installation increases. 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.

Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. 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. Acfoam ii is offered in a variety of thicknesses providing long term thermal resistance lttr values from 5 7 to 26 8.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Polyiso roof insulation is the most widely used product for low slope commercial roofing and provides a high r value that helps meet today s energy code requirements without the added thickness or weight of other products. Benefits of energyguard polyiso roof insulation include. But what does that mean and how do researchers determine r value.

In the nrca roofing manual. Closed cell polyisocyanurate polyiso foam core integrally bonded to non asphaltic fiber reinforced organic felt facers. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Membrane roof systems 2011 and the nrca roofing manual.