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Product Description The Attic Stairway Insulator closes the insulation gap created by attic stair access points in residential housing, leading to reduced energy costs year round. The product is designed to cover access points up to 25 by 54-Inches. This Attic Door Insulation contains 99 percent aluminum foil which has high reflective properties, making it very effective and maintains energy savings even exceeding fiberglass insulation . Reflective heat is overlooked and misunderstood because R-Value does not account for radiant heat so reflective insulation has a greater day to day saving then fiberglass insulation. Easy to handle and install, and it does not require special tools besides staples to tightly seal the adhesive tape to floor.