Gypsum lath orientation across supports?

Gypsum lath orientation across supports?

• A. Perpendicular to supports
• B. Parallel to supports
• C. Diagonal to supports
• D. Rotated relative to supports

Answer: (A)

Gypsum lath should be installed perpendicular to the framing members (across the supports). This position lets fasteners bite into multiple supports, giving a solid, secure base for plaster and a good key for the plaster to grip. If the lath runs parallel to the supports, fasteners may land between supports, providing less secure attachment and increasing the risk of movement, sagging, and cracking. Diagonal or rotated placements aren’t standard practice for gypsum lath in typical wall framing.

Gypsum lath should be installed perpendicular to the framing members (across the supports). This position lets fasteners bite into multiple supports, giving a solid, secure base for plaster and a good key for the plaster to grip. If the lath runs parallel to the supports, fasteners may land between supports, providing less secure attachment and increasing the risk of movement, sagging, and cracking. Diagonal or rotated placements aren’t standard practice for gypsum lath in typical wall framing.