3/8'' High Rib Lath It is easy to cut and form to ornamental plaster work. It provides ample keying for scratch coat. Rib Metal LathRib Lath is a versatile metal lath stiffened by the longitudinal ribs. It has V ribs and greater tensile strength offering excellent plaster base and reinforcement for all types of walls, ceilings and fireproofing of steel beam, and columns. Ribbed lath is ideal for ...