Polyisocyanurate Insulation R Value Per Inch

The r value test method and the long term thermal resistance lttr methodol ogy. This in service r value was intended to account for polyisocyanurate insulation s r value losses over time and provides a more realistic design r value for polyisocyanurate insulation during a roof sys tem s entire design life. Polyiso is typically used with a foil facing and it has an r value of 7 0 to 8 0 per inch of thickness.

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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.

Polyisocyanurate insulation r value per inch.

Polyiso has a high r value per inch compared to other insulation products. 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. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. And nrca s r value recommendations associated with the use of polyisocyanurate insulation used in roof systems.

Insulation is the product found to provide the greatest investment return and offer the most carbon abatement. Polyiso offers a r 6 5 and the highest r value per inch when compared to other 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. The reflective foil facing makes it an excellent insulation board when radiant heat is involved.

As a benchmark one inch of solid wood has an r value of 1. For example a two inch polyiso product has more than twice the insulating value than a one inch product. Keep in mind that polyiso s r value increases with thickness. 1 2014 industry issue update polyiso s r value provided an overview of the theory of foam aging.

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. Using an in service r value of 5 6 per inch of foam thickness. 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. 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.

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