The US Outside Corner Boot is a combination of rubberized asphalt bonded to polyethylene. The adhesive surface is covered with a release liner which will be removed prior to application of Underseal® Underslab Membrane. Apply US Outside Corner Boot on the outside corner to reinforce and seal the Underslab Membrane. Use US Outside Corner Boots at all outside corners. Underslab Membrane corners require a series of cuts, folds, flaps, and patching with LM-95 or Detail Sealant PW, which can leave a pinhole in the corner. This preformed corner boot conforms to the film side of the Underslab Membrane to seal any possible pinhole condition.