What is the minimum width for strip reinforcement for continuous joints of gypsum lath?

What is the minimum width for strip reinforcement for continuous joints of gypsum lath?

• A. 2 inches
• B. 3 inches
• C. 4 inches
• D. 6 inches

Answer: (B)

Continuous joints in gypsum lath need strip reinforcement to prevent cracking and keep the plaster bonded across the joint. The strip must be three inches wide because that width provides enough surface area for the plaster to grab and for the reinforcement to transfer stresses across the joint. A narrower strip would not offer sufficient adhesion or strength, increasing the chance of cracking, while wider strips are not necessary for typical gypsum lath joints and add extra cost without added benefit.

Continuous joints in gypsum lath need strip reinforcement to prevent cracking and keep the plaster bonded across the joint. The strip must be three inches wide because that width provides enough surface area for the plaster to grab and for the reinforcement to transfer stresses across the joint. A narrower strip would not offer sufficient adhesion or strength, increasing the chance of cracking, while wider strips are not necessary for typical gypsum lath joints and add extra cost without added benefit.