A loading dock seal includes a low-profile backer that is vertically adjustable relative to a wall-mounted bracket to facilitate the installation of the seal. In some embodiments the bracket is generally U-shaped with a turned-in lip on one leg of the U-shape. The backer, to which a compressible foam pad is attached, is similarly U-shaped to nest within the bracket. During installation of the seal, the turned-in lip restrains the backer horizontally, yet allows the backer to be adjusted vertically to properly position the seal. Once properly adjusted, an added fastener further fixes the backer to the bracket, so that the seal is fixed both horizontally and vertically. In some embodiments, the low profile of the backer is achieved by forming the both the backer and the bracket out of sheet metal. The backer includes elongated channels or slots for bolt head clearance to accommodate anchor bolts that connect the bracket to a wall.