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[Spray Foam Insulation] Attic air space is insulated because insulation can bond to the underside of the roof sheathing. Attic air space stays as much as 40 percent cooler during the summer.
Attic air space is not insulated because the insulation can only be placed between ceiling joists on the “floor” of the attic. Attic air temperatures can reach 150 degrees or more during the summer.
Cellulose, Fiberglass and Spray Foam Insulation Comparison Chart
Cellulose and Fiberglass Insulation