Polyiso Insulation R Value Thickness

Keep in mind that polyiso s r value increases with thickness.
Polyiso insulation r value thickness. Understanding r value thursday december 13 2018 what does r value mean. The r value of your insulation can optimize your energy savings in any zone. Professional should specify insulation thickness based r value on the 6 0 r inch design guideline associated with the old lttr test method. 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.
Thickness in nominal thickness mm lttr maximum flute span in maximum flute span mm 1 00 25 4 5 7 2 625 66 70 1 30 31 7 7 4 3 675 93 35. R values for commonly available thicknesses of polyisocyanurate insulation board. By blocking thermal bridging a polyiso continuous insulation system increases the overall thermal performance of a wall assembly and a building. Polyiso insulation thickness r value chart.
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. The polyisocyanurate insulation manufacturers association. Getting the interim update.