Spray foam becomes tack-free in 5 to 60 minutes and fully cures in about 8 to 24 hours, depending on the product and conditions.
Calculate the amount of insulation by dividing your attic's square footage by the coverage area of the insulation package you plan to purchase.
Attic insulation should be about 10 to 14 inches deep, achieving an R-38 level, depending on the insulation type.