Polyisocyanurate Foam Insulation R Value

As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles when it is twice as thick as you can see from the chart above. During late 2014 nrca conducted additional limited r value testing of polyisocyanurate insulation and found r values lower than the current lttr values. Tuff r polyisocyanurate insulation consists of high performance high r value closed cell polyisocyanurate foam core boards sandwiched between a choice of durable exterior foil facers.

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They contain low conductivity gases in the cells usually one of the hcfc or cfc gases.

Polyisocyanurate foam insulation r value.

Other materials may only have a fifty percent increase in. Keep in mind that polyiso s r value increases with thickness. A true environmental winner polyiso is a good choice for leadership in energy and environmental design leed credits. The other is a tri plex facer consisting of a three ply laminate of durable kraft.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. On tuff r insulation one facer is a continuous sheet of aluminum foil. 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. 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.

Excellent lttr value compared to any other fm class 1 rated products of equivalent thickness. Polyiso insulation is the best choice as a cost effective energy efficient and environmentally responsible insulation product. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Polyiso s unique benefits include highest r value per inch.

Polyiso is used in roof wall ceiling and specialty applications within commercial and residential buildings of all types. Polyisocyanurate polyiso is a closed cell rigid foam board insulation that is bonded to facers on both sides which are composed of various organic and inorganic materials. An insulation material s resistance to heat flow is rated in terms of r value a higher r value means greater insulating effectiveness i e higher resistance to heat flow. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems.

Cost polyiso is the most expensive of the foam board insulation products however it s the highest r value. Polyurethane and polyisocyanurate are both closed cell foams. Polyiso has a high r value per inch compared to other insulation products. 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.

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