Cornerite may be omitted in which condition?

Cornerite may be omitted in which condition?

• A. When plaster is not continuous from one plane to an adjacent plane
• B. When plaster is continuous across planes
• C. Only if corner reinforcement is used externally
• D. Only if used with metal lath

Answer: (A)

Cornerite is a reinforcing strip placed at wall corners to tie together plaster from adjacent planes and resist cracking where the plaster can move as it cures and as the structure settles. You omit Cornerite when there isn’t a continuous plaster path across the corner—that is, when plaster on one plane does not extend into the corner to meet the plaster on the neighboring plane. In that situation, there’s no continuous mass across the corner to reinforce, so the extra corner reinforcement isn’t needed. If plaster does continue across the corner, Cornerite helps prevent hairline cracks by providing mechanical restraint.

Cornerite is a reinforcing strip placed at wall corners to tie together plaster from adjacent planes and resist cracking where the plaster can move as it cures and as the structure settles. You omit Cornerite when there isn’t a continuous plaster path across the corner—that is, when plaster on one plane does not extend into the corner to meet the plaster on the neighboring plane. In that situation, there’s no continuous mass across the corner to reinforce, so the extra corner reinforcement isn’t needed. If plaster does continue across the corner, Cornerite helps prevent hairline cracks by providing mechanical restraint.