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Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product.
Polyisocyanurate roof insulation r values. 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. More projects select polyiso roof insulation for both new and roof replacement systems than any other insulation product. This industry issue update explains why the nrca recommends using a significantly lower r value for polyiso than pima does. 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.
Benefits of energyguard polyiso roof insulation include. New polyisocyanurate r values is a 2 page 2016 industry issue update from the national roofing contractors association nrca. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is widely used in commercial roofing. In q4 2013 jm will modify its packaging to reflect lttr values by both test methods.
What is polyiso insulation. As an example a 1 board label will include information from lttr s770 03. Recommended reading for anyone specifying polyiso 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.
Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. In the nrca roofing manual. Membrane roof systems 2011 and the nrca roofing manual. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant.
Jm s wall sheathing line ap foil and ci max are not governed by lttr test methods and have different r value measurement standards. Dated its r value recommendations for polyisocyanurate insulation used in roof systems. The information on this page is based on data considered to be true and accurate based on periodic internal. 1 when joints penetrations detailed appropriately.
See also material data sheet msds 1511 or msds 1911. 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. 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. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value.
Jm sheathing r values will not change.
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