Glossary Terms for the Letter W View the Entire Glossary A  | B  | C  | D  | E  | F  | G  | H  | I  | J  | K  | L  | M  | P  | Q  | R  | S  | T  | U  | V  | W Warp Twist or bowing of final casting measured by deviation from plane and tolerance. Wash A sloping horizontal surface formed to cause water to run off. Water Repellant Normally a clear sealer sprayed or brushed on the exposed portion of a masonry wall to deflect moisture. Watertable The course of cast stone that sits on the base course. This course normally transcends an offset in the building. Weep Hole An opening normally in a masonry head joint at the bottom of a unit to allow any moisture behind it to escape. Weld Plate A square metal device cast flush to the surface for attachment by means of welding.