Polyisocyanurate Insulation R Value Chart

As a benchmark one inch of solid wood has an r value of 1.

Polyisocyanurate insulation r value chart.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Since 1978 rmax has been an innovator in building insulation solutions. Thanks to thanks to andrew cole for correcting our data on this product. Let s use the r value of iko s polyiso insulation enerfoil tm as an example.

Polyurethane spray closed cell foam insulation. As foam ages over time air and blowing agents diffuse in and out of the foam structure resulting in reduced r value. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Rigid polyisocyanurate thermal insulation board.

Tapered polyiso minimizes the negative effects of ponding water and extends the service life of a roof. Aging effects comments. The common denominator among varieties of insulation is the r value. During late 2014 nrca conducted additional limited r value testing of polyisocyanurate insulation and found r values lower than the current lttr values.

Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. 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. Carlisle s tapered insulation helps promote rooftop drainage while providing excellent insulating value. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.

The r value of your insulation can optimize your energy savings in any zone. What is polyiso insulation. 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. As part of that standard the products must meet r value requirements presented as long term thermal resistance lttr.

The results also are somewhat lower than the results at 25 f 40 f 75 f and 110 f mean test tem peratures from nrca s 2009 testing. Our comprehensive line of high quality polyiso based products continues to deliver maximum r values minimum environmental impact and efficiency in installation cost and design. Please refer to the technical. Polyiso has a high r value per inch compared to other insulation products.

This chart is a brief synopsis of approvals utilizing firestone resista insulation board. Polyisocyanurate polyiso is a closed cell rigid foam insulation board made with recycled content that is.