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The ZipUP UnderDeck Main Rail is a crucial component in creating an attractive watertight underdecking system in your outdoor space. The Main Rail features a specially-designed channel which connects with the beadline built into ZipUP Panels to form a water and rainproof seal. Attaching directly to the Pitch Rails that are installed on your joists Main Rails are attached with standard 1 to 1-1/2″ long deck screws sold separately. After determining how many ZipUP Panels are needed for your system by using the ZipUP UnderDeck calculator simply subtract 1 to find the number of Main Rails needed.ZipUP UnderDeck is a revolutionary system designed to transform the unused space underneath your elevated deck into a functional outdoor living area. Easy-to-install interlocking panels create a seamless water diversion system between your deck and the area below.