Spray Foam Insulation offers R-value of R7 per inch.

Suitable for commercial and residential construction, Icynene ProSeal™ allows for high initial pass of 3 in., achieving R21 as well as Class II Vapor Retarder in one pass. Closed-cell, medium density insulation features all-season formulation suitable for cold weather applications as low as 23

[source: http://news.thomasnet.com/fullstory/Spray-Foam-Insulation-offers-R-value-of-R7-per-inch-20021470]


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