Polyisocyanurate Roof Insulation R Value

Test results showed r values less than the products established lttr values.

Polyisocyanurate roof insulation r value. In addition to testing at a 75 f mean reference temperature which is typical for r value labeling. Jm revised lttr values jm suggests that design professionals use 5 7 r inchas a design specification for its foam products. 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.

Acfoam polyiso roof insulation. During 2009 nrca conducted limited r value testing of uninstalled polyisocyanurate insulation samples ranging in ages from 4 to 13 months. 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. Benefits of energyguard polyiso roof insulation include.

Polyiso insulation thickness r value chart. 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. 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.

Jm is proud to be a pima member and have its product third party certified under the pima quality mark program. Understanding r value thursday december 13 2018 what does r value mean. 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. 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.