What Is a Weep Screed?

Stucco is permeable. Water from wind-driven rain, sprinkler overspray, condensation, or flashing leaks can and does get behind the finish coat. The question isn't whether water will get in — the question is whether it can get out. Without a weep screed at the base of the wall, water accumulates inside the wall cavity, soaks the wood framing, and rots the home from the outside in.

The weep screed provides an exit. It forms a small gap between the stucco and the foundation, with small drainage holes along its bottom edge, so water running down behind the stucco emerges at ground level instead of pooling inside the wall.

A correctly installed weep screed is:

• Fastened through the sheathing into the framing with corrosion-resistant fasteners (typically galvanized or stainless), at or just above the foundation line.
• Flashed on top with the building paper, so water running down the paper lands on the screed's upper flange and drains outward through the weep holes.
• Set with a minimum 4" clearance above bare earth, or 2" above paved surfaces (concrete patios, walkways).
• Continuous along the entire base of every stucco wall, with no gaps at corners.

Then the lath, building paper, and stucco are installed on top, with the stucco terminating cleanly at the weep screed's vertical leg.

Walk the base of any exterior stucco wall. Look for a thin metal strip running horizontally about 4-8 inches above the ground. If you see it and it has small holes along the bottom, that's a functioning weep screed. If you see stucco meeting soil directly, or a concrete-against-stucco joint with no metal flashing, your weep screed is either buried, damaged, or missing.

• Buried by landscaping. New garden beds, raised mulch, or added hardscape can cover the weep screed. Once buried, water drainage is blocked and moisture wicks up through the stucco into the wall.
• Rusted through. Galvanized weep screeds from the 1970s-80s reach end-of-life after 40+ years. Once the metal rusts through, there's no drainage and no stop for the stucco.
• Painted over. Careless painters can paint over the weep holes, sealing them shut. Water still gets in; it just can't get out.
• Never installed. Pre-1960s homes and some cheap post-war construction skipped the weep screed entirely. The stucco meets the foundation directly, with predictable moisture consequences 30-40 years later.
• Installed without adequate clearance. Too close to soil/paving means water from grade bridges back into the wall.

Signs that your weep screed has failed or is missing:

• Stucco appears to go directly into the soil or concrete with no visible metal strip.
• Rust-colored streaks running down the bottom 6-12 inches of the wall.
• White chalky staining (efflorescence) at the base.
• Soft, bulging, or crumbly stucco in the bottom 2-3 feet.
• Baseboards or flooring damage on interior walls that match exterior wall locations.
• Termite, carpenter ant, or carpenter bee activity near the base.

If the weep screed is just buried, pulling the soil back and verifying drainage clearance is the fix — free, DIY, 30 minutes.

If the screed is rusted, damaged, or missing, the bottom course of stucco has to be cut out, the old screed removed, new flashing installed, the substrate inspected and repaired if rotted, and the stucco rebuilt from the ground up. That's a 3-5 day job per wall and typically costs $1,500-$8,000 per wall depending on length and substrate condition. Details on our weep screed repair service page.