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Underseal® Outside Corner Boot is a 60 mil combination of rubberized asphalt bonded to polyethylene. The adhesive surface is covered with a release liner which will be removed prior to application. Underseal® Outside Corner Boots are designed for use on the outside corner to reinforce and seal the Underslab membrane. Corners can require a series of cuts, folds, flaps, and patching which can leave a pinhole in the corner. This preformed corner boot conforms to the side of the membrane to seal any possible pinhole condition and allow for faster, labor saving installation of the system.