Polyisocyanurate Roof Insulation R Value

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.

Polyisocyanurate roof insulation r value.

Benefits of energyguard polyiso roof insulation include. 3 rsi is the metric expression of r value m 2 k w. Acfoam polyiso roof insulation. 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 has a high r value per inch compared to other insulation products. In addition to testing at a 75 f mean reference temperature which is typical for r value labeling. 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.

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. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Jm revised lttr values jm suggests that design professionals use 5 7 r inchas a design specification for its foam products.

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