R Value For Polyiso Roof Insulation

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.

R value for polyiso roof insulation.

Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. Benefits of energyguard polyiso roof insulation include. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods.

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. 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 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. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product.

What is polyiso insulation. Polyiso has a high r value per inch compared to other insulation products. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.

Recommended reading for anyone specifying polyiso insulation. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. 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. Nrca also is aware of two additional test programs conducted by others that have shown results similar to nrca s results.

Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. As an example a 1 board label will include information from lttr s770 03. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. Polyiso insulation thickness r value chart.

Jm sheathing r values will not change. When it comes to insulation performance the difference is in the details. 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.