Which type of joint reinforcement should be used in a veneer plaster system?

• A. Paper Tape
• B. Metal
• C. None
• D. Glass Fiber Tape

Answer: (D)

Reinforcing joints in a veneer plaster system needs a material that bonds well with plaster, resists moisture, and can accommodate slight movement without cracking the finish. Glass fiber tape fits this requirement best because its fiberglass mesh is embedded in the plaster, helping to distribute stresses across the joint and prevent crack propagation as the plaster cures and ages. It resists moisture-related deterioration and won’t rust or stain like metal. Paper tape can wick moisture and may wrinkle or loosen in plaster applications, while metal tape can corrode and cause issues over time. Omitting reinforcement leaves joints more prone to cracking under shrinkage and movement.