Polyisocyanurate Roof Insulation R Value

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Polyisocyanurate roof insulation r value.

Polyiso still remains the highest r value per inch of any available insulation. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Benefits of energyguard polyiso roof insulation include. Acfoam polyiso roof insulation.

3 rsi is the metric expression of r value m 2 k w. In addition to testing at a 75 f mean reference temperature which is typical for r value labeling. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. During 2009 nrca conducted limited r value testing of uninstalled polyisocyanurate insulation samples ranging in ages from 4 to 13 months.

Test results showed r values less than the products established lttr values. 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. Polyiso insulation thickness r value chart.

Polyiso has a high r value per inch compared to other insulation products. Understanding r value thursday december 13 2018 what does r value mean. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. To minimize the effects of thermal bridging atlas strongly recommends the use of multiple layers when the total desired or specified r value requires an insulation thickness greater than 2 7 thick.