I have heard that rowlock brick copings and brick sills should not be used. Is this true? If so, why not?
A brick is called a rowlock when it's laid on its face edge. Though many owners and architects find rowlock brick copings and sills appealing, they should be avoided in exterior applications. Brick rowlock copings contain many more horizontal joints than do concrete, stone, or metal copings. Each of these joints provides a potential entry point for water. Because of this, many brick sills and copings deteriorate after several freeze-thaw cycles. If rowlock brick copings or sills are used, they must be flashed. Place flashing underneath the coping or sill. Extend it beyond the face of the masonry and bend the projected edge down 1/4 inch to form a drip. Seal any penetrations through the flashing, such as anchors. Install weep holes at the level of the flashing at 16 inches on center for wicks and 24 inches on center for holes and tubes. Also, slope the copings or sills to prevent water from sitting on the surface. For brick sills, the Brick Institute of America (BIA) recommends a minimum slope of 15 degrees (Technical Note 36, "Brick Masonry Details: Sills and Soffits").