Cornerite legs must be at least how many inches?

Cornerite legs must be at least how many inches?

• A. 2 inches
• B. 1 inch
• C. 3 inches
• D. 4 inches

Answer: (A)

The key idea is that the corner reinforcement needs enough length on each leg to be securely anchored and to give the plaster coats something solid to grab onto. Two inches is the practical minimum because it provides enough leg on each side to extend into the backing (lath or substrate) and to be covered by the first plaster coats. This helps keep the corner true and prevents movement, cracking, or loss of the corner as the plaster is applied and dries. If the legs were shorter, there wouldn’t be enough embedding for secure engagement, which can lead to a weaker corner.

The key idea is that the corner reinforcement needs enough length on each leg to be securely anchored and to give the plaster coats something solid to grab onto. Two inches is the practical minimum because it provides enough leg on each side to extend into the backing (lath or substrate) and to be covered by the first plaster coats. This helps keep the corner true and prevents movement, cracking, or loss of the corner as the plaster is applied and dries. If the legs were shorter, there wouldn’t be enough embedding for secure engagement, which can lead to a weaker corner.