Mildew or mold on exterior paint — Los Angeles, California
Dark green, gray, or black splotches on exterior-painted surfaces — siding, trim, soffits, and window frames — are usually mildew or mold growth on the paint film itself. Mildew thrives on north-facing walls, shaded areas, and surfaces near sprinklers or dense landscaping where moisture lingers. Unlike dirt, mildew is organic growth that feeds on the paint's binder and won't wash off with water alone. A bleach solution test confirms mildew: apply a few drops of household bleach (1:10 dilution) — if the spot lightens within 1–2 minutes, it's mildew; if not, it's dirt or staining. Professional pressure washing with mildewcide ($200–$600 for a typical home) removes existing growth, but repainting with mildew-resistant paint ($40–$60/gallon) is needed if the paint film is degraded. Prevention: trim vegetation 12–18 inches from walls, redirect sprinklers, ensure gutters don't overflow onto siding, and use paint with built-in mildewcide for shaded exposures.
Waarom dit veel voorkomt in Los Angeles
UV damage fades exterior paint faster in LA, requiring more frequent repainting — every 5–7 years vs. 10+ in temperate climates. Stucco exteriors (dominant in LA) require specialized preparation and breathable paint systems.
Who to call
For this problem in Los Angeles, call a: Schilder
Vind een Schilder in Los AngelesSymptoms to look for
- Dark green, gray, or black splotches concentrated on north-facing or shaded walls
- Discoloration that spreads gradually over weeks or months (unlike splatter or staining)
- Spots lighten when dabbed with diluted bleach (the mildew test)
- Musty odor near affected exterior walls, especially after rain
- Paint underneath the mildew appears soft, chalky, or degraded when wiped
Spoeddienst in Los Angeles
Emergency services in Los Angeles typically respond within 30–60 minutes during business hours, but traffic can extend response times to 2+ hours across the metro area. After-hours emergency plumbing and electrical services run $125–$250/hour. California law requires contractors to be licensed for work over $500.