R Value For Polyiso Roof Insulation

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.

R value for polyiso roof insulation.

Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. During 2005 nrca and the canadian roofing contractors association participated in a limited research project where the r values of stored uninstalled polyisocyanurate insulation were. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. Benefits of energyguard polyiso roof insulation include.

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. What is polyiso insulation. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. 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.

Polyiso has a high r value per inch compared to other insulation products. Nrca also is aware of two additional test programs conducted by others that have shown results similar to nrca s results. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof.

Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. When it comes to insulation performance the difference is in the details. As an example a 1 board label will include information from lttr s770 03. Jm sheathing r values will not change.

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. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. Understanding r value thursday december 13 2018 what does r value mean. Recommended reading for anyone specifying polyiso insulation.

Polyiso insulation thickness r value chart. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing.