Annual walk-around — 30 minutes, once a year
Do this in spring after the last rain and before the summer heat. Walk every wall of the house and check for:
- Hairline cracks — new or widening. Note location. Cracks under 1/16" wide are cosmetic; wider than 1/8" needs attention.
- Bulging or spongy sections — press on any area that looks different. If it gives, call a contractor.
- White chalky stains (efflorescence) — salts from water movement through cement. Means moisture is traveling through the wall.
- Rust stains — usually bleeding from corroded lath or fasteners inside the wall. Serious.
- Soft base (bottom 2-3 feet) — check where the stucco meets the weep screed. Poke gently with a screwdriver. Soft = moisture damage.
- Paint peeling or blistering — usually a sign of moisture behind the finish.
- Gaps around windows/doors — open caulk joints let water into the wall.
What to DIY vs. call in
DIY is fine for:
- Sealing hairline cracks with paintable elastomeric caulk.
- Recaulking window and door perimeters with exterior-grade sealant (every 5-10 years).
- Cleaning dirt and cobwebs from the wall with a low-pressure hose rinse.
- Clearing landscaping away from the weep screed to restore the 4" soil clearance required by California Residential Code R703.6.2.1.
- Repainting the wall with exterior-grade acrylic or elastomeric paint.
Call a contractor for:
- Cracks wider than 1/8" or stair-step cracks at corners.
- Any bulging or hollow-sounding sections.
- Efflorescence, rust stains, or soft spots.
- Buried or missing weep screed.
- Damaged stucco below the building paper (visible framing or lath).
- Pest activity near the base of exterior walls.
Sprinkler and landscaping rules
- Keep sprinkler spray off the wall. Stucco can handle water, but repeated daily soaking drives efflorescence and accelerates finish-coat wear. Redirect sprinklers so the wall stays dry.
- Maintain weep screed clearance. Code requires 4" above earth and 2" above paved surfaces. When landscapers add mulch or build up garden beds, they often bury the screed. Dig it back out once a year.
- Pull ivy, climbing roses, and espalier away. Plants rooting into stucco damage the finish and trap moisture.
- Don't lean ladders, tools, or trash cans against the stucco. Dents on the bottom 3 feet are almost always tool-caused.
Caulking schedule
Caulk is the weakest link in a stucco wall. It dries out, cracks, pulls away, and lets water into places that water shouldn't go. Plan to:
- Inspect caulk yearly at window sills, window jambs, window heads, door frames, light fixture boxes, hose bib penetrations, dryer vents, and utility penetrations.
- Recaulk every 5-10 years depending on sun exposure. South-facing walls need recaulking sooner.
- Use exterior-grade sealant rated for stucco application (most high-quality polyurethane or silicone-modified acrylic sealants work).
- Don't caulk cracks in the stucco itself with regular caulk — use elastomeric stucco-patch products that flex and accept paint.
When to repaint vs. when to refinish
A good paint job lasts 7-10 years in Southern California sun. Plan for a repaint every decade. If you're past 15 years on the same paint and the wall is chalky, flaking, or color-faded, repaint is overdue.
If the stucco itself is cracking in patterns (not just paint peeling), repaint won't fix it. That's a structural issue — either a repair or a re-finish coat is the right answer. See paint vs. new finish coat.