This detail illustrates a shelf angle mechanically fastened to the concrete masonry backup with anchor bolts at regular intervals. There is no provision for the thermal break other than the shims behind the shelf angle. The primary function of the shims is to bring the angle out the required distance to support the brick veneer adequately. There is a horizontal expansion joint below the shelf angle to allow for vertical expansion of the brick veneer. A course of lipped brick, usually prefabricated, resides below the shelf angle to tighten up the joint width visible below the shelf angle. The upturn in the lipped brick coincides roughly with the outside face of the horizontal leg of the angle, enabling the flashing to continue horizontally out of the wall. The flashing protects the shelf angle, and weep vents allow moisture to exit the wall. A drip edge is recommended in this application, to further protect the steel angle and to ensure water does not travel back into the wall beneath the flashing.