Polyisocyanurate Insulation R Value Per Inch

1 2014 industry issue update polyiso s r value provided an overview of the theory of foam aging.

Polyisocyanurate insulation r value per inch.

For example a two inch polyiso product has more than twice the insulating value than a one inch product. The reflective foil facing makes it an excellent insulation board when radiant heat is involved. And nrca s r value recommendations associated with the use of polyisocyanurate insulation used in roof systems. Polyiso offers a r 6 5 and the highest r value per inch when compared to other insulation.

The r value test method and the long term thermal resistance lttr methodol ogy. Keep in mind that polyiso s r value increases with thickness. Using an in service r value of 5 6 per inch of foam thickness. Based on consensus standards in both the united states and canada long term thermal resistance lttr is a scientifically supported method to calculate the 15 year time weighted average r value of roof insulation.

The increase in thermal resistance for thicker products is due to the reduced contribution of more thermally conductive elements such as the facer and the denser cell. As a benchmark one inch of solid wood has an r value of 1. 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. Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.

Insulation is the product found to provide the greatest investment return and offer the most carbon abatement. Polyiso which forbes considers a green insulation offers the highest r value in its class with a 20 70 greater r value per inch than any other rigid foam plastic insulation. Polyiso has a high r value per inch compared to other insulation products. H shield cg hunter panels the big news the r value of insulation is r value chart caflei polyiso manufacturers turn blind eye to cellulose insulation vs foamrigid insulation r value per inch chart hoskinr value of polyisocyanurate insulation chart boskinrigid insulation r value chart koskintsp 3 page rmaxpir polyisocyanurate boards insulation thermalinsulation r values.