What is the function of weep holes in brick veneer walls?

Weep holes are essential components in brick veneer walls primarily designed to allow moisture that may accumulate in the wall cavity to escape. This feature helps prevent water from building up, which could lead to various structural issues, including mold growth and deterioration of materials.

When rain or moisture penetrates the outer layer of a brick veneer, it can travel down the wall and accumulate in the space between the brick and the building's interior layers. Weep holes provide an exit point for this water, thereby protecting the wall's integrity and preventing potential damage to the internal structure of the building.

While other functions, such as ventilation, may also be important for the overall performance of the wall system, the fundamental role of weep holes is specifically tied to water management and drainage. They ensure that any moisture that gets trapped in the cavity of a brick veneer wall has a means to escape, thus maintaining the health of the building's materials and minimizing long-term damage.