In Maricopa County Planning & Development's directive, the answer is no: do not cover the holes in a stucco weep screed with new patio concrete. Before setting forms, check the proposed paving height against the drainage edge at the wall and decide where water will go after it leaves the slab.
Keep the drainage edge clear
A weep screed is the metal edge at the bottom of some stucco wall systems. It lets moisture behind the stucco drain outward. The county's Weep Screed directive, revised June 26, 2023, references a minimum of 4 inches above earth or 2 inches above paved areas. It says the screed holes must not be covered and that patio slabs or pavers must slope away from the building.
That makes the finished elevation important. A new patio can leave less clearance than the old ground did, even if the slab itself slopes away. Mark the proposed height at the wall before concrete is placed. Check the visible drainage openings, the nearby threshold, and the route runoff will take beyond the patio edge.
Covered no-step entries need a detail
Under a covered patio or front entry, a no-step layout may not leave the usual clearance above the paving. For that situation, the county directive lists two alternatives: a drain directly below the weep screed with positive slope to an approved drainage location, or an air gap below the screed so it can still drain. The right detail depends on the site and the authority reviewing the work. Do not assume a bead of sealant, a surface cut, or a drain with no outlet solves the condition.
This directive is from Maricopa County Planning & Development. Cities can review grading and drainage under their own requirements. For example, the City of Phoenix maintains separate grading and drainage guidance. Confirm the applicable detail with the building department for the property's address before changing the wall edge or paving height.
Before the pour, ask these questions
- Where is the weep screed, and how much clearance will remain above the finished patio?
- Will every drainage opening stay clear after concrete, pavers, and finish work are complete?
- Which way will the patio drain, and where does runoff go beyond its edge?
- If the entry is designed without a step, what approved detail keeps the wall able to drain?
If the existing wall or paving already hides the drainage edge, ask a stucco professional or the local building department to review it before adding another layer. Quest's concrete work and stucco service pages cover the related trades. Our guide to what a patio quote should cover explains the other scope questions to settle before the pour.
Set the patio elevation around a working stucco drainage edge. Keep the openings clear and verify the local detail before the concrete arrives.
