While flashing is essential to good performance of brick masonry, proper detailing and construction is of the utmost importance. Flashing which stops short of extending through a wall is little better than no flashing at all. It is important that flashing penetrating a wythe of brick extend fully to the outside and form a drip. Flashing and counter flashing must be adequately lapped such that water cannot get behind the inner layer to enter the interior of the structure. Furthermore, flashing must be continuous. Any bends or breaks must be completely sealed. Special preformed shapes which minimize the cutting necessary are available for problem areas such as outside corners.