← Masonry Glossary
Weep hole
A weep hole is a small drainage opening that lets water escape from behind a wall.
A weep hole is a small opening left at the base of a retaining or veneer wall to let collected water drain out instead of building up behind the structure. Weep holes work with drainage aggregate and pipe to relieve hydrostatic pressure. Omitting them is a common cause of efflorescence, freezing damage, and wall failure.
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