Iso Board Insulation R Value

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.

Iso board insulation r value.

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. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. R 7 5 scored squared edge rigid foam board insulation sheathing model 88wd view the owens corning exterior insulation. Owens corning foamular 150 1 1 2 in.

Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles. Select 2 to 4 items to compare. R values for commonly available thicknesses of polyisocyanurate insulation board. 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. 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. Firestone iso 95 gl insulation offers high energy efficiency through the r value ratings per inch versus other insulation materials. R 3 2 polyisocyanurate rigid foam insulation board model 754404 13 82 13 82.

High r value polyiso has a high r value per inch compared to other insulation products. 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. 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. Polyiso insulation thickness r value chart.

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. 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. Xps has an r value of 4 5 to 5 0 per inch of thickness. Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness.