Window and door leaks are a major for contractors and builders. To prevent water from entering the building, these unfavourable penetration areas must be properly. Corners are the most penetrable of window and door systems and are rarely flashed well, if at all. This a top-hole flashing solution for corners of windows and doors. These window flashing corners any window/door design and provides top-hole insulation protection against leaks.It saves labor and makes installation active and relaxed. No specialized training is. Also with weather imperviable barriers and sill pan installation in addition to swank wrap and weem holes.