Polyisocyanurate Roof Insulation R Values

Recommended reading for anyone specifying polyiso insulation.

Polyisocyanurate roof insulation r values.

Benefits of energyguard polyiso roof insulation include. In the nrca roofing manual. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

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. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. 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. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product.

1 when joints penetrations detailed appropriately. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. 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. See also material data sheet msds 1511 or msds 1911.

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. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. What is polyiso insulation.

Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature. 2 stated thermal resistance values are based upon conditioning requirements and test methodology found in astm c1289 and astm c518 for foil faced polyisocyanurate insulation.

Firestone isogard polyiso insulation goes even further and was the first product on the market to meet both astm c1289 required and recommended thermal performance values. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. Jm sheathing r values will not change. Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.