Reflectix® Sill Sealer is designed to reduce air leakage between the foundation wall and the sill plate. It can additionally be used to seal around window and door frames. The product is applicable for residential and commercial construction, slab on grade, and in crawl spaces or basements. The Reflectix® Sill Sealer is available through Contractor Sales Groups.• Size: 7.5" x 50''• Color: White• Made from ribbed polyethylene foam (total thickness 3/16")• Designed to reduce air leakage between the foundation wall and sill plate• Mildew and water resistant• Also provides protection against sill plate rot• Roll.