Abstract: A system for attachment to beams in which at least two U-shaped cleats are secured over a beam. A cap is attached to the cleats, the cap enclosing the U-shaped cleats, and preventing rain from entering the beam through fasteners used to secure the cleats. On the underside of the cap, stop tabs space the top of the cap from the beam. On the upperside of the cap, T-slots form channels with a gap opening. These channels may be used to attach equipment to the beam.