Stucco netting for exterior surfaces must have openings no larger than:

Stucco netting for exterior surfaces must have openings no larger than:

• A. 2 sq in
• B. 4 sq in
• C. 6 sq in
• D. 8 sq in

Answer: (B)

Openings in exterior stucco netting are kept small to provide a solid mechanical key for the plaster and to maintain effective reinforcement. When the openings are limited to four square inches, the plaster has enough surface to grip the netting and the base coat to bond evenly, which helps distribute stresses and prevents voids that can lead to cracking or debonding as the wall moves or during drying. If openings were larger, the plaster could sag or pull through the mesh, creating weak spots and cracks that become visible in the finish. This is why the standard specifies no larger than four square inches. Smaller openings still reinforce, but the four-square-inch limit is the practical maximum that balances ease of application with durability.

Openings in exterior stucco netting are kept small to provide a solid mechanical key for the plaster and to maintain effective reinforcement. When the openings are limited to four square inches, the plaster has enough surface to grip the netting and the base coat to bond evenly, which helps distribute stresses and prevents voids that can lead to cracking or debonding as the wall moves or during drying. If openings were larger, the plaster could sag or pull through the mesh, creating weak spots and cracks that become visible in the finish. This is why the standard specifies no larger than four square inches. Smaller openings still reinforce, but the four-square-inch limit is the practical maximum that balances ease of application with durability.