A waterproofing membrane sill pan assembly is detailed with an L-angle continuation and specific dimensional clearances. The sill pan features a minimum five-eighths inch upstand extending one-half inch minimum above the bottom edge of the window. End returns require a minimum four-inch height, with a two-inch minimum vertical dimension and overall width to fit the rough opening. The detail membrane continues up the supporting L-angle for positive water control at the window sill junction.
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