R 25 Rigid Roof Insulation Thickness

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness.

R 25 rigid roof insulation thickness.

As a benchmark one inch of solid wood has an r value of 1. 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 values vary depending on many factors including the mean temperature at which the test is conducted and the age of the sample at the time of testing. Owens corning foamular thermapink extruded polystyrene xps insulation is a closed cell moisture resistant rigid foam board specially designed for roofing applications.

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Ashrae climate zone iecc 2012 r value requirements polyiso thickness to meet iecc old lttr method new lttr method 1 2 3 r 20 2 layers 1 7 2 layers 1 8 4 5 r 25 2 layers 2 1 2 layers 2 2 6 r 30 2 layers 2 5 2 layers 2 6. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

Foamular thermapink 25 owens corning 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. Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product.

As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles. Please consider this extra thickness requirement when designing blocking heights and specifying fastener lengths. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. A higher insulation r value usually means a higher price point as well.

When it comes to insulation performance the difference is in the details. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

Benefits of energyguard polyiso roof insulation include.