Stucco Repair & Installation
Stucco cracks. The real question is whether a crack is cosmetic or the wall telling you that water has been getting behind it, and that diagnosis comes before any bag of mix is opened.
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Overview
Stucco Repair & Installation
There are two families of stucco on homes in this region and they look nearly identical from the curb. Traditional cement stucco is applied in coats over metal lath and building paper. Synthetic stucco, or EIFS, is a thin acrylic finish over foam board. They fail in completely different ways and are repaired with completely different materials, so identifying which one you have is step one. A hollow tap, rounded corners, foam trim bands and sealant joints instead of metal casing beads usually mean synthetic.
Over wood framing in Gulf Coast humidity, stucco has to be able to drain. Water gets behind every cladding ever invented; what protects the wall is a proper drainage plane behind the lath, head flashing over openings tucked behind that barrier, a weep screed at the base that isn’t buried, and an unobstructed way out at the bottom. Where those exist, small cracks are a maintenance item. Where they don’t, small cracks become a rot problem inside the wall.
Repairing stucco without investigating moisture is applying makeup to a wet wall. Probe readings taken on a grid, interior evidence, and a small opening near the suspected source usually give a real answer. The usual sources are predictable: window and door heads, chimney chases, parapets, roof-to-wall junctions missing a kickout, and the base of the wall where a patio pour or a raised bed swallowed the weep screed.
The things that actually decide this job
Learn to read the crack pattern
Fine map-like cracking across a field is shrinkage and is usually cosmetic. Cracks running diagonally out of window and door corners are movement, and in this region that often traces to expansive clay under the slab. Long horizontal cracks at floor lines suggest framing shrinkage or lath joints. Bulges, soft spots and a hollow sound mean the stucco has debonded from the substrate, which is not a caulk-and-paint repair at all.
The weep screed and the bottom of the wall
The base of stucco over framing needs clearance above soil and above paved surfaces, with a weep screed that lets water exit. Added patios, new flower beds and raised soil bury that screed constantly, and once it is buried the wall wicks moisture upward into the sill plate and framing. If your stucco disappears into the ground or into a concrete pour, that is a finding, not a detail. Fixing it can mean cutting back the pour.
Flashing beats sealant, always
A bead of sealant around a window is maintenance with a service life measured in a few years. Head flashing over an opening, integrated behind the weather barrier, is permanent water management. Casing beads at terminations need a gap that drains rather than a smear that dams. Where a roof edge dies into a stucco wall, a kickout flashing is the single most commonly missing piece and the single most common cause of a rotted wall below.
Texture and color matching is the craft
Sand float, dash, lace and skip trowel, and smooth Santa Barbara finishes each have their own aggregate size, float rhythm and hand. A patch that’s structurally perfect still reads as a patch if the texture doesn’t match, and color rarely matches an aged wall even when the mix is right. Plan for blending — a fog coat or a repaint out to a natural break like a corner, a control joint or a change of plane.
Practical considerations
If it’s EIFS, treat it as its own system
Barrier EIFS was built with no drainage path, which puts the entire waterproofing load on sealant joints that age out. Drainage EIFS adds a channelled path behind the foam and a fluid-applied barrier, and it is the version worth installing today. Repairs need EIFS-specific base coat, mesh and finish — cement patch over foam will fail. Probe testing before purchase or repair is standard practice with these walls, and lenders and inspectors often ask about it.
Movement joints on a moving soil
Expansive Beaumont and Lissie clays move under structures seasonally, and a rigid cement skin is the first thing to show it. Control and expansion joints break a large field into panels so the wall cracks where you decided rather than where it wants to. Long uninterrupted elevations with no joints crack on a predictable rhythm. A re-stucco is the moment to add joints at floor lines, at changes of substrate and at opening corners where stress concentrates.
Coatings can trap what they should let out
Elastomeric coatings bridge hairline cracks and look like a tidy fix, which is exactly why they get applied to walls that are already wet. Sealing a wall that can’t dry outward accelerates damage behind the finish. Establish that the wall is dry and the source is fixed, then coat. Shaded north elevations in Gulf Coast humidity also grow algae and mildew, which needs cleaning and a mildew-resistant finish rather than another film on top.
Cement stucco needs time and the right weather
Traditional stucco is a cured material, not a dried one. Scratch and brown coats need moisture and a rest period between them, and hot, windy afternoons flash-dry the surface faster than it can hydrate, which produces weak, crazed work. Summer storms interrupt schedules and can wash a fresh coat. A crew that wants to scratch, brown and finish in two days is compressing chemistry, and that shows up as cracking within the first year.
At a glance
| System | What’s behind it | Where it fits |
|---|---|---|
| Three-coat over lath | Two layers of building paper, metal lath, weep screed | Full re-stucco over framing; the most repairable |
| One- or two-coat over foam sheathing | Foam board, lath, thinner cement layers | Newer builds; thin build limits how far you can cut back |
| Barrier EIFS | Foam bonded to sheathing with no drainage gap | Legacy walls where sealant joints carry the whole load |
| Drainage EIFS | Channelled foam over a fluid-applied barrier | The synthetic option worth installing today |
| Cement stucco over masonry or CMU | Bonded directly to the block; no lath required | Chimneys, piers, screen and garden walls |
| Elastomeric recoat | Whatever is already there, sound or not | Cosmetic renewal on a wall proven dry first |
Common questions
Can you just patch the cracked areas instead of redoing the wall?
Yes, when the cracks are shrinkage, the wall tests dry and the substrate is bonded. Cracks get cut out, the base is prepared, and the patch is textured to match. Two honest cautions: a crack caused by movement will very likely return along the same line unless a control joint is introduced there, and a patch almost never matches surrounding color. Budget for blending out to a natural break. If the wall tests wet, patching just hides the timeline.
How do you tell whether water is behind the stucco?
Non-invasive scanning and infrared imaging under the right temperature conditions can point at suspect areas, but the standard answer comes from probe readings: fine pins pushed through the finish on a grid, especially below windows, at the base of walls, around penetrations and at chimney chases. Readings are compared against dry reference areas on the same elevation. Interior clues help too — stained baseboard, soft sheetrock at an exterior corner, a musty smell. Document readings before and after so repairs can be verified.
How do I know if I have EIFS or traditional stucco?
Tap the wall: traditional cement over lath sounds solid, EIFS over foam sounds hollow and gives slightly under a knuckle. Look at the edges where the finish terminates at a hose bib, a light block or the roofline; foam thickness is usually visible. EIFS tends to have rounded corners, decorative foam bands, and sealant joints where windows meet the wall instead of a metal casing bead. This matters for insurance questions, for resale disclosures and for which repair materials are correct.
Can stucco go over my existing brick or siding?
Over sound masonry, yes — it bonds directly with proper surface prep and often a bonding agent, which is why chimneys and screen walls take stucco well. Over lap siding, no, not directly. It would need furring, a proper drainage plane, lath and full coats, which adds thickness that changes every window and door reveal, plus weight the wall has to carry. In most cases removing the siding and building the assembly correctly costs less than working around it and performs far better.
Why does my stucco keep cracking in the same spot?
Because something is still moving there. The two usual causes are seasonal slab movement on expansive clay concentrating stress at an opening corner, and a missing control joint on a long uninterrupted panel. Repeated patching without addressing either just buys a season. The practical fixes are drainage and moisture management around the foundation — gutters carried away from the house, consistent watering, no ponding at the perimeter — plus a control joint placed where the crack keeps forming. To have a wall assessed, call (832) 513-5639.
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