In a masonry cavity wall, what is the maximum horizontal distance between metal ties?

In a masonry cavity wall, what is the maximum horizontal distance between metal ties?

• A. 42
• B. 30
• C. 36
• D. 24

Answer: (C)

Metal wall ties keep the outer and inner leaves of a masonry cavity wall connected, so the wall behaves as a single unit under loads from wind, gravity, and settlement. To maintain that connection along the length of the wall, ties must be placed at regular intervals and not spaced too far apart. The maximum horizontal distance used in practice is 900 mm (about 36 inches). This spacing ensures the leaves stay aligned and capable of transferring lateral forces, preventing movement, cracking, or separation of the leaves. Spacing farther apart could allow significant differential movement, while spacing much more tightly isn’t typically required and adds unnecessary cost.

Metal wall ties keep the outer and inner leaves of a masonry cavity wall connected, so the wall behaves as a single unit under loads from wind, gravity, and settlement. To maintain that connection along the length of the wall, ties must be placed at regular intervals and not spaced too far apart. The maximum horizontal distance used in practice is 900 mm (about 36 inches). This spacing ensures the leaves stay aligned and capable of transferring lateral forces, preventing movement, cracking, or separation of the leaves. Spacing farther apart could allow significant differential movement, while spacing much more tightly isn’t typically required and adds unnecessary cost.