Rib expanded metal lath Expanded Metal Lath has stiffening V ribs providing strength for its tensile force. Stiffened by longitudinal ribs, gives a uniform coat depth for large areas. Provides an excellent plaster base. It's ideal for providing a high degree key of mechanical bonding with plaster or render. Widely used as a background for plaster, render, stucco application in construction of suspended ceilings partition.