What do weepholes facilitate in masonry walls?

Weepholes are critical components in masonry wall construction, specifically designed to facilitate water drainage. These small openings allow any moisture that accumulates within the wall cavity to escape, preventing the build-up of water that can lead to damage such as mold growth, rusting of reinforcements, and deterioration of the masonry itself. By enabling proper drainage, weepholes help maintain the structural integrity of the wall and ensure that moisture does not negatively impact the materials used in construction. Their placement is strategically designed to ensure effective drainage while still providing some level of protection against pest ingress and airborne debris.