Polyurethane foam is not new; it's been used in the industry for over 70 years. It has even been applied to tanks during World War II so soldiers could stay warm inside them. It was also used in our space shuttle program and is currently used in refrigerators and freezers to frost-proof the units and also surrounds some dishwashers to create a quieter appliance.
    Polyurethane is manufactured in an Open and Closed cell type. A one-pound open cell foam, such as Icynene, is similar to the texture of a sponge. The R-value of 1lb foam is 2.5-3.7 per inch. Two-pound, or closed cell, foam has a true R-Value of 6.7 per inch.
    Closed cell polyurethane foam will repel water and not absorb water like the open cell foam. Another advantage of closed cell Polyurethane foam insulation is that 2" x 4"  cavity wall space will achieve the same results, if not higher R-Value, than a 2" x 6" wall space using fiberglass batt or cellulose blown type of insulation. Which in new construction will save you hundreds to thousands on lumber.
    OSB or plywood is not needed for the outside sheathing because Closed-cell polyurethane foam is strong enough to support the wall, which adds strength to your building as well.
    Your HVAC system can be downsized because of the lower heating and cooling loads, which in turn, means lower energy costs.

Click on the link provided for further studies of the benefits of SPF and the differences in open vs closed cell SPF Insulation  Click Here

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