Its unique solid metal ribs running the length of the lath is used for 3-coat stucco. Rib lath provides greater stiffness and strength to support finishes over a greater span as with ceilings and soffits utilizing joists set at 24-inches on center. See Support Spacing for Metal Lath table below for lath and support spacing.3/8`` High Rib LathDesigned with seven longitudinal ribs (each 3/8” high) and eight small flat ribs in between the high ribs. This product is used almost exclusively for ceiling and soffit applications. ASTM C1063 allows framing for High Rib Lath to span up to 24” on center. High Rib Lath is installed with nose of ribs touching framing members.