R Value For Polyiso Roof Insulation

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

R value for polyiso roof insulation.

Jm sheathing r values will not change. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Polyiso has a high r value per inch compared to other insulation products. 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.

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. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. 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. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. When it comes to insulation performance the difference is in the details.

Benefits of energyguard polyiso roof insulation include. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product.

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. 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. As an example a 1 board label will include information from lttr s770 03. Understanding r value thursday december 13 2018 what does r value mean.

What is polyiso insulation. Recommended reading for anyone specifying polyiso insulation. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca.