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Post Cost Of Spray Foam Roof Insulation Esque . The national average cost to install spray foam insulation can range between $1.00 and $3.00 per square board foot (1 inch thick) of spf insulation installed. Spray foam insulation cons high cost. The Cost of Reinstalling Spray Foam Insulation Premier Spray Foam from premiersprayfoamco.com In general, spray foam insulation cost runs between $1,284 and $3,741 to have it professionally installed, with a national average of $2,492. This cost is equal to $2.50 to $3 per square foot, or $250 to $300 per square, for 1 inch of foam. This cost can be as low as $1,200 but go up to $3,700 or more, depending on the size of the.