| 摘要 |
A hollow rectangular concrete building block is provided having features which prevent and impede the infiltration of water into and migration of water through the block. The hollow block conventionally includes parallel interior and exterior vertical walls with at least one transverse vertical web spanning between the walls to form a unitary block with an interior cavity. Migration of water from the exterior to interior is impeded by a plurality of vertical ribs protruding from each side surface of the web. Water which has penetrated into the block cavity is redirected downwardly, as it trickles across the web, by the ribs to be ultimately expelled at the base of the block array with conventional flashing and weep holes. Grooves in the upper surface of the webs prevent migration of water along the upper surface and redirect the water to flow downwardly along the side surfaces of the web. The upper exterior edge of the exterior wall of the block may preferably be beveled particularly in the application of the invention to architectural masonary units where the mortar beads may be inset from the block faces up to 3/4 of an inch for visual effect. Bevelling the exterior edge is done to prevent pooling of water in the mortar joint area; to shed water downwardly along the exterior surface of the exterior wall; and to enable access to the joint for sufficient compaction of the mortar joint prior to setting, thereby minimizing cracks in the finished mortar through which water may infiltrate into the block cavity.
|
