Polyisocyanurate Roof Insulation R Value

Acfoam polyiso roof insulation.

Polyisocyanurate roof insulation r value.

Jm revised lttr values jm suggests that design professionals use 5 7 r inchas a design specification for its foam products. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Polyiso still remains the highest r value per inch of any available insulation. Understanding r value thursday december 13 2018 what does r value mean.

During 2009 nrca conducted limited r value testing of uninstalled polyisocyanurate insulation samples ranging in ages from 4 to 13 months. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. 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. In addition to testing at a 75 f mean reference temperature which is typical for r value labeling.

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. 3 rsi is the metric expression of r value m 2 k w. Polyiso insulation thickness r value chart. Jm is proud to be a pima member and have its product third party certified under the pima quality mark program.

Benefits of energyguard polyiso roof insulation include. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. Polyiso has a high r value per inch compared to other insulation products. 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.