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.

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. 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. Benefits of energyguard polyiso roof insulation include. 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.

As an example a 1 board label will include information from lttr s770 03. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. When it comes to insulation performance the difference is in the details.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Jm sheathing r values will not change. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. 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 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. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. 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. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. What is polyiso insulation. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

Recommended reading for anyone specifying polyiso insulation. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. Understanding r value thursday december 13 2018 what does r value mean.