Polyiso Roof Insulation R Values

Resista 1 polyisocyanruate insulation board has a ul class a rating for fire resistance when used over combustible decks and is compatible with single ply and modified bitumen roofing systems.

Polyiso roof insulation r values.

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. Polyiso has a high r value per inch compared to other insulation products. Membrane roof systems 2011 and the nrca roofing manual. 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.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Closed cell polyisocyanurate polyiso foam core integrally bonded to non asphaltic fiber reinforced organic felt facers. In the nrca roofing manual. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Acfoam ii is offered in a variety of thicknesses providing long term thermal resistance lttr values from 5 7 to 26 8. 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. Benefits of energyguard polyiso roof insulation include.

Polyiso still remains the highest r value per inch of any available insulation. Jm revised lttr values jm suggests that design professionals use 5 7 r inchas a design specification for its foam products. Competitors may require up to 3 1 of insulation to achieve comparable ratings. But what does that mean and how do researchers determine r value.

To compare different insulation products researchers have to create the exact same conditions and then measure how well the insulation performs. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. 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. 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.