In veneer plaster systems, which reinforcement material is recommended?

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

Answer: (A)

Reinforcement in veneer plaster systems serves to hold the plaster together as it cures and as the wall moves a little, preventing cracks from propagating and helping the finish stay smooth. Glass fiber tape is the best choice here because it has high tensile strength with very little stretch, so it can bridge hairline cracks without widening them. It bonds well with plaster, resists moisture, and won’t rust or stain, making it durable for veneer plaster over gypsum board or similar substrates.

Metal reinforcement, like traditional metal lath, is heavier and can corrode or show through the finish, which isn’t ideal for veneer plaster. Paper tape is suited for drywall finishing but doesn’t provide the same crack-bridging strength or moisture resistance needed for veneer plaster. None would leave joints unsupported and more prone to cracking, leading to a rough finish.