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.

Polyiso has a high r value per inch compared to other insulation products. When it comes to insulation performance the difference is in the details. Understanding r value thursday december 13 2018 what does r value mean. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca.

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. Polyiso insulation thickness r value chart. What is polyiso insulation.

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. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. 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.

Benefits of energyguard polyiso roof insulation include. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. 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 s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. Jm sheathing r values will not change. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

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. Recommended reading for anyone specifying polyiso insulation.