In veneer masonry construction, which feature primarily allows moisture to escape from the cavity?

• A. Ties secure the veneer to the backing.
• B. Veneer anchors use mechanical anchors to the structural frame.
• C. Weep holes enable drainage of moisture from the cavity.
• D. Insulation in the cavity is the primary moisture control.

Answer: (C)

When a veneer wall has a cavity, the path for moisture to escape is provided by weep holes. These small openings at the bottom of the cavity give any water that has penetrated the veneer a gravity-driven exit to the exterior, especially when paired with flashing that guides water down to them. This drainage keeps the cavity dry and prevents moisture buildup that could cause staining, freeze-thaw damage, or mold.

Other features in veneer construction serve different roles: ties and anchors hold the veneer to the backing and ensure stability, while insulation in the cavity improves thermal performance. They do not primarily provide a drainage route for moisture, which is why the weep holes are the key element for moisture escape.