In ceilings finished with metal lath and plaster, what is the maximum pipe size that may be supported by a toggle?

In ceilings finished with metal lath and plaster, what is the maximum pipe size that may be supported by a toggle?

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

Answer: (A)

In ceilings finished with metal lath and plaster, a toggle must rely on the plaster and lath to hold the weight. The plaster surface is relatively weak and the lath grid isn’t designed to carry heavy loads, so the support device is limited by how much load the plaster can safely transfer. Because of this, the typical maximum pipe size that a toggle can reliably support is a half-inch pipe. Using larger pipe would place excessive weight and leverage on the plaster, risking failure of the anchor or damage to the ceiling. If a larger pipe is needed, it should be run to a structural member above the plaster or supported with a more robust hanger designed for plaster and lath ceilings.

In ceilings finished with metal lath and plaster, a toggle must rely on the plaster and lath to hold the weight. The plaster surface is relatively weak and the lath grid isn’t designed to carry heavy loads, so the support device is limited by how much load the plaster can safely transfer. Because of this, the typical maximum pipe size that a toggle can reliably support is a half-inch pipe. Using larger pipe would place excessive weight and leverage on the plaster, risking failure of the anchor or damage to the ceiling. If a larger pipe is needed, it should be run to a structural member above the plaster or supported with a more robust hanger designed for plaster and lath ceilings.