Too often, drawings do not clearly indicate or note how to terminate the horizontal and vertical legs (or returns) of flashing. Project drawings and specifications commonly conflict with each other. To ensure the proper installation of flashing, both the drawings and the project specifications must clearly indicate and explain how to treat the horizontal and vertical ends. The horizontal leg (or return) of the flashing must be extended beyond the outer wythe of masonry or at least be terminated flush with the exterior face of the masonry. This has been a recommended standard for years; yet some designers still specify that horizontal flashing legs be terminated within the outer masonry wythe. At certain locations, such as foundations or above window openings, flashing can be terminated flush with the outer face of the wall. However, at shelf-angle locations, the flashing should be extended beyond the outer face of the wall and formed to create a drip. If flexible flashing is used, a stainless steel drip edge may be installed beneath the flashing edge. Flashing must be extended beyond the exterior masonry face to assure that water collected by the flashing flows completely out of the wall system. Water then will slowly drain out of the exterior wall, even at locations where there are no weepholes, because of the bond break that occurs where the brick or mortar interfaces with the flashing. The vertical flashing legs must also be properly indicated and noted on the architectural drawings and in the masonry specifications. The way the vertical ends should be terminated depends on the type of masonry wall system. For brick veneer systems, the vertical leg of the flashing should be detailed and noted to terminate behind water-resistant building paper or building wrap, as recommended by the Brick Institute of America. The flashing should be inserted under the building wrap and lapped a minimum of 6 inches. In cavity wall systems, the vertical leg of the flashing should be detailed and noted to terminate within the concrete masonry backup. The vertical end of the flashing should be installed flush with the face of the CMU backup and extended horizontally into the mortar bed joint--approximately 4 inches into the CMU wythe.