What does a weep screed do at the base of a stucco wall?

It provides two functions: it establishes the correct termination thickness for the stucco assembly, and it lets incidental water that gets behind the stucco drain out rather than accumulate against the framing. The small holes or slots along the lower flange are the weep openings.

Should a weep screed be visible?

Yes. The lower perforated flange must remain exposed above soil, paving, or landscaping — typically at least 2 inches above hardscape and 4 inches above grade. If soil or concrete covers the screed, the drainage function is blocked and moisture can accumulate behind the wall.

What happens if weep screed is missing or buried?

Water that infiltrates behind the stucco has no exit path. It accumulates at the base of the wall and can saturate the sheathing, rot the bottom plates, and cause significant hidden structural damage. Buried screeds are one of the most common causes of stucco-related moisture damage.

Do I need a permit to replace weep screed?

In most jurisdictions, yes. Replacing weep screed requires removing and restoring the exterior weather barrier system, which typically triggers a building permit and inspection. Check with your local building department before starting work.

How much does weep screed replacement cost?

Material cost for weep screed itself is modest — a few dollars per linear foot. The real cost is labor and related stucco repair. Expect to pay $15 to $40 per linear foot for a full repair that includes removing the lower stucco, inspecting the substrate, and restoring all plaster coats. Costs rise if framing damage is found.

Weep Screed — Stucco Base Drainage Trim and Code Clearances

A weep screed is a perforated metal or vinyl J-profile trim installed at the base of exterior stucco walls to drain trapped moisture and terminate the plaster assembly cleanly above grade.

Weep Screed diagram — labeled parts and installation context

What It Is

Weep screed is a thin-gauge galvanized steel or PVC extrusion that serves two functions simultaneously: it establishes the lower thickness plane of a three-coat stucco system and it provides a continuous exit path for incidental water that migrates behind the stucco-mesh and metal-lath layers. The screed body has a J-shaped profile — one leg laps over the face of the sheathing while the lower flange projects outward and downward, terminating in a series of weep holes or open slots that allow water to escape.

Building codes in stucco-heavy regions such as California, Arizona, and Florida require weep screed at the base of any stucco assembly over a wood-framed wall. The requirement exists because stucco is vapor-permeable and absorbs and releases moisture; the screed prevents that moisture from accumulating against the framing.

Types

Standard galvanized steel weep screed is the most common type. It is formed from 26-gauge hot-dipped galvanized sheet metal and is available in 10-foot lengths. The face is perforated to allow drainage.

Vinyl (PVC) weep screed is used in high-corrosion coastal environments where galvanized steel may rust prematurely. It is slightly more flexible than steel and cannot be bent sharply without cracking.

Architectural weep screed includes a wider reveal or a colored finish for decorative bases where the bottom edge of the stucco wall is intentionally visible.

Where It Is Used

Weep screed is installed at the base of every exterior stucco wall above a concrete foundation, slab edge, or framed floor platform. It sits directly on top of the foundation or floor framing, with the perforated lower flange extending below the scratch-coat and brown coat so the stucco terminates against the screed's upper leg rather than running down to grade.

Code requires the bottom of the weep screed flange to be a minimum of 2 inches above any paved surface (such as a concrete walkway or patio) and 4 inches above unpaved grade. These clearances prevent soil contact and splash erosion from burying the drainage opening.

How to Identify One

Look at the base of any stucco wall where it meets a foundation, slab, or concrete curb. A weep screed appears as a horizontal metal strip with a visible lower flange that extends slightly away from the wall face. The flange will have small holes or slots running along its length. The top of the screed is embedded in the stucco and will not be visible once plaster coats are applied.

If the bottom of a stucco wall has no visible metal edge — just stucco running straight into the slab or soil — the weep screed is either missing, buried, or was never installed. Buried or missing screeds are a common finding during stucco moisture investigations.

Replacement

Weep screed replacement requires removing the lower portion of the stucco assembly — typically the bottom 12 to 18 inches of the wall — to expose the old screed and lath. The screed is then cut loose, the substrate is dried and inspected for framing rot, new screed is fastened, new lath is applied, and the stucco coats are reapplied in sequence.

This is almost always a permit-required repair because it involves the exterior weather barrier system. Costs vary widely with wall area and the amount of substrate damage found once the stucco is removed.