This detail illustrates a masonry window head condition with a loose steel lintel angle. The lintel bears on the brick at the jambs of the window. The CMU is supported across the opening by a continuous precast concrete lintel with a height and thickness similar to that of the CMU backing. Such prefabricated lintels are commonly used for convenience and flexibility and must be cut for length. Continuous insulation offers excellent thermal control. An optional cavity drainage insert above the lintel protects the weep vents at the bottom of the cavity from becoming obstructed. The steel lintel is protected with thru-wall flashing returning vertically at each end to form an end dam. The durable drip edge guards against moisture reentry and may be notched to avoid excessively thick laps. This detail also incorporates a vertical brick expansion joint in line with the end of the lintel.