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EERE » BTO » Building America » Solution Center Home » Image Gallery » This attic is insulated to R-64 with a hybrid application of 11 inches of open-cell spray foam (R-4.45/in) plus 2 inches of closed-cell spray foam (R-7.4/in) that completely fills the roof rafter cavities and encases the rafters.

This attic is insulated to R-64 with a hybrid application of 11 inches of open-cell spray foam (R-4.45/in) plus 2 inches of closed-cell spray foam (R-7.4/in) that completely fills the roof rafter cavities and encases the rafters.