C-Hooks and clamps should be used on parapets that are at least how many wythe of brick and have been surveyed and approved by a PE or RA?

C-Hooks and clamps should be used on parapets that are at least how many wythe of brick and have been surveyed and approved by a PE or RA?

• A. 3 wythe of brick
• B. 2 wythe of brick
• C. 4 wythe of brick
• D. 1 wythe of brick and surveyed by PE or RA

Answer: (A)

The key idea is that attaching rigging hardware to a parapet must be done only if the parapet has enough thickness and has been vetted by a professional. A parapet that is at least three wythe thick provides a solid, load-bearing surface that can safely receive anchors, distribute the forces, and resist pullout or crack propagation. In addition, having the parapet surveyed and approved by a licensed professional engineer or registered architect confirms the specific attachment details, load paths, and overall structural capability for those hooks and clamps. This combination—three wythe thickness plus formal engineering approval—helps ensure safe, reliable anchorage and compliance with design standards. Thinner parapets or skipping the professional review could lead to unsafe loads or failure.

The key idea is that attaching rigging hardware to a parapet must be done only if the parapet has enough thickness and has been vetted by a professional. A parapet that is at least three wythe thick provides a solid, load-bearing surface that can safely receive anchors, distribute the forces, and resist pullout or crack propagation. In addition, having the parapet surveyed and approved by a licensed professional engineer or registered architect confirms the specific attachment details, load paths, and overall structural capability for those hooks and clamps. This combination—three wythe thickness plus formal engineering approval—helps ensure safe, reliable anchorage and compliance with design standards. Thinner parapets or skipping the professional review could lead to unsafe loads or failure.