In southern climate zones, open-cell foam is well-suited for new residential construction. The reasons? Performance and low cost per R-Value. On average open-cell is close to half the price per R-Value than medium density closed-cell foam. Its low-density reduces sound transmission more effectively than traditional insulation types making it a popular choice for sound sensitive interior walls as well as the thermal envelope. But while acoustics may sound good, the air-barrier open-cell foam will make a utility bill look better too by effectively eliminating convective air movement, a major contributor of energy loss in every type of structure including residential.
Closed-cell, medium density spray foam packs a high R-Value averaging 6.5 to 7 per inch applied. The added density gives closed-cell more durability and is certified as a class II vapor barrier making it a popular choice for agricultural barns, metal buildings, and commercial construction. And with additional racking strength, up to 250%, there is not much swaying in the wind.
Versatile enough to withstand the elements, closed-cell installs nicely to the outside of exterior walls as well. Sometimes called “out-sulation”, this install is a 4 in 1 package deal providing the air barrier, vapor control, drain plane, and insulation. No taping or sealing the joints, this is a complete monolithic air and vapor control system. Thermal bridging does not stand a chance with this application.