Stucco
Stucco is everywhere in Bay Area housing, and it is widely misunderstood in one specific way: people treat it as a waterproof shell. It is not. Stucco is a cladding that sheds most water and lets the wall behind it dry out — which works well for decades, right up until something interrupts the drying.
That distinction is the difference between a crack that is purely cosmetic and a crack that is quietly soaking the framing behind your wall.
Not all cracks are the same
The first job on any stucco call is deciding which kind you have.
Hairline and shrinkage cracks are normal. Stucco is cement-based, it shrinks as it cures and moves with temperature, and fine cracking is part of how the material behaves. These are a cosmetic and maintenance issue.
Cracks that matter look different, and are worth calling about:
- Wide enough to fit a coin edge into
- Diagonal cracks running from the corners of windows and doors — usually movement, not shrinkage
- Horizontal cracks, which are the least normal of all
- Cracks with staining, efflorescence (a white powdery bloom) or soft material around them
- Anything that has clearly moved: one side of the crack sitting proud of the other
The last group is where water is either getting in or already inside. Patching those without finding the path is repainting the symptom.
Where water actually gets in
Almost never through the field of the wall. It gets in at the interruptions:
- Around windows and doors, where the flashing and sealant do the real work
- At penetrations — vents, hose bibs, light fixtures, anything passing through
- Where stucco meets another material, like siding, trim or a roof line
- At the bottom edge, where stucco held too close to soil or paving wicks moisture upward and never dries
So a repair that fixes the problem starts at the interruption, not at the crack. If the source is not found, the same crack comes back in the same place.
Repairs and texture matching
A structurally perfect stucco patch that does not match the surrounding texture is still an obvious patch — and stucco is unforgiving here, because the texture is the finish. There is no paint layer thick enough to hide a mismatch.
Matching means reading the existing texture (its pattern, its coarseness, how it was floated) and reproducing it by hand at the edges of the repair, feathering the transition rather than stopping at a hard line. On weathered walls, color rarely matches exactly even when the texture does, which is why repairs on a visible elevation are often best followed by painting the whole wall corner to corner.
What we handle
- Crack repair, from hairline sealing to cutting out and rebuilding a section
- Moisture damage — removing failed material, addressing where the water came from, rebuilding
- Minor structural repairs behind the stucco where the damage reached the framing
- Re-stuccoing sections, and full facades as part of an exterior remodel
- Texture matching on repairs, and new texture on new work
- Sealing and preparation before exterior painting
What it looks like while we are there
Cutting out failed stucco is loud and dusty, and it happens outside — which mostly means it affects your neighbors’ afternoon more than your living room. Areas get protected: windows, plants, walkways and anything below the work.
Stucco is applied in coats with curing time between them, and it needs to be kept damp while it cures rather than drying fast in the sun. Like concrete, the curing schedule is not padding — rushing it is what produces a patch that cracks again in a year.
Across the Bay Area
We repair and apply stucco in San Rafael, Tiburon, Mill Valley and across Marin, in San Francisco, and out through Berkeley, Orinda, Walnut Creek and Vallejo.
Send a photo of the crack with some of the wall around it, and a second photo of the nearest window or vent. Between those two we can usually tell you whether you are looking at normal aging or something worth getting in front of before the rain.