Door dam installation on concrete requires drilling with a specialized bit.

Drilling is the final step and must be done carefully for a secure fit.

Anchor screws should penetrate 5–7 inches for maximum strength.

Shallow holes may weaken the structure; add extra anchors if needed.

Common concrete anchors: wedge, sleeve, drop-in, and concrete screws.

Anchor type depends on load requirements and surface conditions.

Wall anchors on structure-mounted dams require less depth—focus is sealing, not load-bearing.

Frame-mounted dams need anchors to go 5–7 inches deep into concrete.

Anchors must be properly installed to hold during floods.

Cover unused anchor holes with flat or rounded screws to prevent debris buildup.

Proper installation and maintenance are vital for long-term flood protection.