R Value For Polyiso Roof Insulation

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

R value for polyiso roof 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. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.

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. Understanding r value thursday december 13 2018 what does r value mean. What is polyiso insulation. 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.

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. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. 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.

Benefits of energyguard polyiso roof insulation include. 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. 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.

Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. Recommended reading for anyone specifying polyiso insulation. Jm sheathing r values will not change. Nrca also is aware of two additional test programs conducted by others that have shown results similar to nrca s results.

Polyiso insulation thickness r value chart. Polyiso has a high r value per inch compared to other insulation products. As an example a 1 board label will include information from lttr s770 03.