What is the minimum diameter and spacing for weep holes in exterior walls?

The minimum diameter and spacing for weep holes in exterior walls are crucial for effective drainage and moisture management. The correct answer specifies a diameter of 3/16 inch, which is adequate to allow for the timely exit of water that has infiltrated the wall system. In construction, weep holes serve as a critical component in preventing water buildup within the wall cavity, which could lead to mold, wood rot, and other moisture-related issues.

The spacing of every 32 inches is also a standard practice that ensures sufficient drainage without compromising the structural integrity of the wall. Properly spaced weep holes allow for effective air circulation as well, which helps in the drying process of any moisture that may accumulate.

This combination of diameter and spacing adheres to common building codes and guidelines that aim to maintain a dry building envelope. In contrast, the other choices may not provide adequate drainage or may be spaced too far apart to effectively manage moisture, potentially leading to problems over time.