If there is no external corner reinforcement, how should the lath be installed?

If there is no external corner reinforcement, how should the lath be installed?

• A. Furred out and carried around corners for at least one support on frame constructions
• B. Nailed directly to the studs without turning corners
• C. Wrapped with Cornerite at every corner
• D. Installed with a gap at corners

Answer: (A)

Without external corner reinforcement, you must fur out and carry the lath around the corner so there is a solid backing at the corner on frame construction. Furring creates a continuous support that the lath can be fastened to around the corner, giving the plaster a firm key and reducing cracking where stresses concentrate. Wrapping with Cornerite would provide corner reinforcement, which isn’t available here. Nails straight to studs without turning corners leave the corner unsupported, and installing with a gap leaves the corner unbacked and prone to movement and cracks.

Without external corner reinforcement, you must fur out and carry the lath around the corner so there is a solid backing at the corner on frame construction. Furring creates a continuous support that the lath can be fastened to around the corner, giving the plaster a firm key and reducing cracking where stresses concentrate. Wrapping with Cornerite would provide corner reinforcement, which isn’t available here. Nails straight to studs without turning corners leave the corner unsupported, and installing with a gap leaves the corner unbacked and prone to movement and cracks.