Abstract: A sill assembly for doors and windows that provides a weep system for channeling water away from the sill assembly. The sill assembly includes an elongated frame member formed with a longitudinally extending upwardly open channel that defines a rear wall, a front wall and a floor that extends laterally and slopes downwardly from the rear wall to the front wall, and a sill that extends laterally from the front wall to a forward edge of the frame member. An end plug is securely mounted to one end of the elongated frame member and has a laterally extending drainage ramp disposed at a location flush with and immediately adjacent to the floor of the channel. The ramp leads to a drainage chamber which in turn has an opening closed by a hinged weep door.