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.

New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. 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. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does.

Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. Benefits of energyguard polyiso roof insulation include. 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. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Understanding r value thursday december 13 2018 what does r value mean. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. What is polyiso insulation. Polyiso insulation thickness r value chart.

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. 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. 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. Jm sheathing r values will not change.

Recommended reading for anyone specifying polyiso insulation. When it comes to insulation performance the difference is in the details. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. Nrca also is aware of two additional test programs conducted by others that have shown results similar to nrca s results.

Polyiso has a high r value per inch compared to other insulation products. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards.