What is installed on the side of a concrete wall to assist with moisture control?

The correct answer is weep holes because they are specifically designed openings installed in the wall that allow moisture to escape from the wall's interior. This is crucial for preventing water buildup within the wall, which can lead to structural issues, mold growth, and deterioration of the concrete over time.

Weep holes ensure that any moisture that accumulates inside can be released, maintaining the wall's integrity and reducing the risk of water damage. They are especially important in applications like retaining walls, where water can easily become trapped due to soil saturation or rainfall.

While French drains, vents, and drain tiles also serve important roles in moisture management and drainage systems, they operate in different contexts. French drains and drain tiles are used to redirect groundwater around structures, and vents typically aid in air circulation rather than specifically addressing moisture escaping from a concrete wall. Therefore, weep holes are the most relevant solution for moisture control directly in a concrete wall structure.