This detail illustrates a a shelf angle mechanically fastened to the concrete masonry backup with anchor bolts at regular intervals. There is no provision for 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 adequately support the brick veneer. There is a horizontal expansion joint below the shelf angle to allow for vertical expansion of the brick veneer. There are full, uncut brick above and below the shelf angle. The thickness of the horizontal leg of the shelf angle and the width of the expansion joint below will result in a horizontal expansion joint wider than 3/8 in. If this expansion joint is in a prominent place, its excessive width may be visually objectionable; however if it is higher than eye level, it may go unnoticed.