Patent ID: 7216460

Claim:
A drainage system for use in concrete masonry unit (CMU) wall construction, comprising: an elongate flashing member adapted to be received beneath a course of CMUs, in use; a layer of water permeable material attached to an upper surface of the flashing member, the layer of water permeable material including a longitudinal portion extending longitudinally adjacent and spaced from a rear edge of the flashing member and a plurality of transverse portions extending transversely from the longitudinal portion to a front edge of the flashing member; and a plurality of separate blocks of water permeable material, each block being positioned above the layer of water permeable material and adapted to extend upwardly into a cavity of the CMUs, in use, the water permeable material of the layer and the blocks having a porosity sufficient to permit water to pass therethrough but substantially insufficient to permit mortar and debris to pass therethrough so that water in cavities of CMUs drains through the transverse portions.