Understanding Weep Holes in Masonry Walls: Placement, Purpose, and Michigan Code Requirements
Weep holes are small openings located at the bottom of exterior masonry walls, specifically above the flashing, to allow moisture to escape from behind the wall. Despite brick or stone’s durability, moisture intrusion is a significant concern in masonry construction. Water can enter through porous materials, cracks, or mortar joints and, if not properly managed, may lead to mold, deterioration of structural elements, and efflorescence (white salt deposits).

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