Polyisocyanurate Roof Insulation Thickness

In the nrca roofing manual.

Polyisocyanurate roof insulation thickness.

Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. Membrane roof systems 2015 nrca had recommended designers use in service r values of 5 0 per inch thickness in predominant. Polyisocyanurate polyiso polyiso is the industry s premier roofing insulation. Dated its r value recommendations for polyisocyanurate insulation used in roof systems.

It can be attached using a variety of methods and is compatible with all of carlisle s single ply systems. All atlas acfoam polyiso insulation boards are qualitymark certified providing consumers an easy way to identify premium products that meet or exceed building codes for the best in roof performance. Additionally trymer pir is offered in a variety of different densities and compressive strengths to ensure the product consistency is suited for the unique needs of. Other materials may only have a fifty percent increase in r value when their thickness is.

Acfoam polyiso roof insulation atlas acfoam products are among the most sustainable and widely used building insulation materials available today. Trymer pir polyisocyanurate is a closed cell foam insulation for industrial pipes vessels and equipment. Trymer pir can be used in applications that operate at temperatures ranging from 297 f to 300 f 183 c to 148 c. 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.

Firestone isogard hd composite cover board is ideal for both new construction and reroof applications with available thicknesses from 1 5 to 4 two board sizes and three coated glass facers that provide mold resistance. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. 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. Jm suggests that the design professional specify polyiso insulation by its thickness and its full astm designation rather than.

Likewise for jobs that will be permitted in 2014 the design professional should specify insulation thickness based on the 5 7 r inch design guideline associated with the new lttr test method. Old lttr test method. Benefits of energyguard polyiso roof insulation include. Membrane roof systems 2011 and the nrca roofing manual.

As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles when it is twice as thick as you can see from the chart above. Polyiso has a high r value per inch compared to other insulation products.