Iso Board Insulation R Value

The thermal resistance r value of isoboard is calculated by dividing the thickness of the isoboard by the thermal conductivity k value to achieve the table below.

Iso board insulation r value.

Polyiso insulation thickness r value chart. The thermal conductivity k value of new isoboard is 0 024w m c and that of 5 year aged isoboard at 90 relative humidity is 0 03w m c which is referred to as the long term design value. Firestone iso 95 gl insulation the highest thermal ratings. 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.

In addition to nrca s design in service r value recommenda tions for polyisocyanurate insulation nrca recommends design ers specify polyisocyanurate insulation by its desired thickness and not lttr or r value to avoid possible confusion. 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. Compatible with all types of commercial roofing systems the lightweight easy to handle insulation is especially suited for direct application on fm approved and ul classified steel roof deck assemblies. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer.

Getting the interim update. Because it s highly energy efficient with the highest r value ratings per inch the use of iso 95 gl insulation in a firestone roofing system provides a cost effective solution for today s oof design r challenges and is preferred for any and every roofing system. R 7 5 scored squared edge rigid foam board insulation sheathing model 88wd view the owens corning exterior insulation. Understanding r value thursday december 13 2018 what does r value mean.

R 3 2 polyisocyanurate rigid foam insulation board model 754404 13 82 13 82. Firestone iso 95 gl insulation offers high energy efficiency through the r value ratings per inch versus other insulation materials. Owens corning foamular 150 1 1 2 in. High r value polyiso has a high r value per inch compared to other insulation products.

R values for commonly available thicknesses of polyisocyanurate insulation board. Select 2 to 4 items to compare. Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles. Get free shipping on qualified iso foam board insulation or buy online pick up in store today in the building materials department.