The butyl rubber tapes that covers the aluminum foil is fit for the waterproofing and sealing for various of kinds of the roofing engineering, color steel, steel structure and waterproof roll and PC sheet which are exposed to the sunshine,butyl rubber seal tape can be installed easily, quickly and ideally on tight corners, textured, uneven, and most jagged. You can also use it easily on unusual patterns. Installs without gaps and can reliably shut off moisture, vapor, and other leakages Pack of 1 Pcs and 5 meter