Weep Screed

Right where a stucco wall meets the foundation, a long L-shaped or J-shaped metal strip called a weep screed gets nailed along the bottom edge. It does two jobs. It gives the stucco a clean, straight stopping point above the ground, and it lets any water that drained down behind the stucco escape through small weep holes in its bottom flange instead of pooling inside the wall.

The 2021 International Residential Code (IRC), Section R703.6, requires a weep screed at the base of exterior stucco walls on framed construction. The code sets a minimum height: the screed must sit at least 4 inches above the earth (grade) or at least 2 inches above paved surfaces like a sidewalk or patio. The water-resistive barrier and the stucco lap over the top flange of the screed so water is directed onto and out through it.

In Arizona, weep screed placement is a common point of trouble because of how homes meet the desert. When landscapers later raise the soil, pour a patio, or bank gravel against the wall and bury the weep screed, the drainage path is blocked and stucco can wick moisture from the ground. That trapped moisture leads to staining, efflorescence, and rot, and a buried weep screed is a frequent construction defect complaint.

A weep screed is different from other stucco trims like casing bead or control joints, which shape edges and manage cracking rather than drain water. The rule to remember on any Arizona home: keep soil, mulch, and hardscape below the weep screed so it can do its one job, which is to let the wall drain.