Patent ID: 7448175

Claim:
A drainage system for use in concrete masonry unit (CMU) wall construction, comprising: a masonry wall including a plurality of CMUs, each CMU including at least one cavity having a cavity width and the cavity having an inside face adjacent an outside face of the masonry wall; a tray unit sized and shaped to be received beneath one or more CMUs, in use, the tray unit including a peripheral flange and having a tray width sufficient to extend past the inside face of the one or more CMUs but less than the entire cavity width; a pan supported by the peripheral flange; and a strip of water permeable material attached to an upper surface of the pan and extending transversely beyond a front edge of the pan, wherein the pan is inclined downwardly toward the strip and the water permeable material of the strip has a porosity sufficient to permit water to pass therethrough but substantially insufficient to permit mortar and debris to pass therethrough so that water in a hollow core of the CMU drains through the strip.