R 25 Rigid Roof Insulation Thickness

Please consider this extra thickness requirement when designing blocking heights and specifying fastener lengths.

R 25 rigid roof insulation thickness.

Typically a higher insulation r rating means better climate control and better energy efficiency for your home. As a benchmark one inch of solid wood has an r value of 1. Firestone iso 95 gl polyiso insulation has a higher r value than other insulation products while also outperforming competitive polyiso at low temperature. 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.

Benefits of energyguard polyiso roof insulation include. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. A higher insulation r value usually means a higher price point as well.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles.

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. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed. All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered. Owens corning foamular thermapink extruded polystyrene xps insulation is a closed cell moisture resistant rigid foam board specially designed for roofing applications.

Foamular thermapink 25 owens corning insulation. 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. 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. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.

When it comes to insulation performance the difference is in the details.