R Value For Polyiso Roof Insulation

Benefits of energyguard polyiso roof insulation include.

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. 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. Polyiso has a high r value per inch compared to other insulation products.

Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. As an example a 1 board label will include information from lttr s770 03. 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. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. What is polyiso insulation. Understanding r value thursday december 13 2018 what does r value mean. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does.

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. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. 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.

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. Recommended reading for anyone specifying polyiso insulation. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca.

More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. Jm sheathing r values will not change. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.