R Value For Polyiso Roof Insulation

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.

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. 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. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof.

Polyiso insulation thickness r value chart. 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. Understanding r value thursday december 13 2018 what does r value mean.

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. Benefits of energyguard polyiso roof insulation include. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods.

What is polyiso 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. As an example a 1 board label will include information from lttr s770 03. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Recommended reading for anyone specifying polyiso insulation. Nrca also is aware of two additional test programs conducted by others that have shown results similar to nrca s results. Jm sheathing r values will not change.

Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does.