What design feature should be included in a steel arch shoe at an exterior canopy to minimize moisture buildup?

• A. Drain slot
• B. Overhang extension
• C. Insulation blanket
• D. Sealed joint with epoxy

Answer: (A)

Moisture control in exterior metal connections relies on giving water a way to exit rather than letting it sit in pockets. A steel arch shoe at an exterior canopy often collects rainwater or condensation in its hollow area. A drain slot provides a controlled path for that water to escape to the exterior, keeping the arch shoe dry and reducing corrosion, staining, and ice buildup between rain events.

The other features don’t address drainage as directly: an overhang extension helps shed water but doesn’t remove water once it’s in a pocket; an insulation blanket can trap moisture and condensation against the steel; a sealed joint with epoxy can prevent water ingress but may trap moisture inside and deteriorate with outdoor cycling.