Polyisocyanurate Roof Insulation R Values

Jm sheathing r values will not change.

Polyisocyanurate roof insulation r values.

This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. Benefits of energyguard polyiso roof insulation include. In the nrca roofing manual. Recommended reading for anyone specifying polyiso insulation.

Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. Membrane roof systems 2011 and the nrca roofing manual.

Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. What is polyiso insulation. 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. Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards.

Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature. 1 when joints penetrations detailed appropriately. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods. 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.

The information on this page is based on data considered to be true and accurate based on periodic internal. See also material data sheet msds 1511 or msds 1911. 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. Polyiso has a high r value per inch compared to other insulation products.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. 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. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.

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