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We are the manufacturer of preformed butyl tape, an integral part of an industrial roofing system. In a built-up roof, double-sided butyl is used on the end laps of the liner panel, and a single-faced Polyband strip along the side laps. The top sheet, or weather sheet, is sealed along the end laps and side laps with double-sided butyl tape. Composite panel roofs are sealed with double-sided butyl tape along both end laps and side laps. Foam fillers at the ridge and eaves are fixed in place with a thinner tape and this is also used in the production of roof lights. Butyl tape has further applications around roof lights, gutters, and flashings. Some wall cladding designs also call for butyl tape to be applied along the side laps. Roof and wall membranes are also sealed with double-sided butyl. Also known as metal roofing tape, metal butyl sealant tape.