What is the required lap distance for a 4 inch WWM lap?

What is the required lap distance for a 4 inch WWM lap?

• A. 4 inches
• B. 8 inches
• C. 6 inches
• D. 10 inches

Answer: (C)

When reinforcing plaster or masonry with woven wire mesh, the overlap between sheets (the lap) is used to make a continuous reinforcement so cracks don’t propagate along joints. For a 4 inch woven wire mesh, the required overlap is six inches. This amount provides enough continuous bonding through the plaster to transfer stresses across joints. A smaller overlap, like four inches, would not give enough continuity and could allow cracking, while a much larger overlap, such as eight or ten inches, adds unnecessary plaster thickness and labor without added benefit.

When reinforcing plaster or masonry with woven wire mesh, the overlap between sheets (the lap) is used to make a continuous reinforcement so cracks don’t propagate along joints. For a 4 inch woven wire mesh, the required overlap is six inches. This amount provides enough continuous bonding through the plaster to transfer stresses across joints. A smaller overlap, like four inches, would not give enough continuity and could allow cracking, while a much larger overlap, such as eight or ten inches, adds unnecessary plaster thickness and labor without added benefit.