Mold in Charleston
Mold needs moisture, warmth and something to grow on, and Charleston supplies the first two for much of the year. A roof leak, a slow plumbing drip, a crawlspace that stays damp, or storm water that soaked a wall can turn into visible growth within days. Cleaning up a spot of mildew in a bathroom is a homeowner job. Removing mold from inside walls, under floors or through a crawlspace is a bigger one, and in South Carolina it's worth understanding what the law does and doesn't cover before you hire.
What South Carolina regulates
South Carolina has no state agency that regulates mold remediation. The General Assembly said so itself in the 2019 joint resolution, Act No. 112, that created its Mold Remediation and Abatement Study Committee. In practice, that means the questions about a mold company's methods, experience and references are yours to ask, and the answers in the written plan are what you're relying on.
The repair work that follows removal is a different matter. Replacing drywall, flooring, framing or cabinets is home repair. South Carolina law requires a residential builder license from the Residential Builders Commission when a home construction, repair or improvement job costs more than $5,000, and a residential specialty contractor license for specialized trade work on a home costing more than $500. If the same company will remove the mold and rebuild, ask which license it holds for the rebuild, and look it up with the commission.
Why it grows here
NOAA's engineering weather data for Charleston counts about 1,820 hours a year with the wet-bulb temperature at 73°F or higher and about 3,372 hours at 67°F or higher. The 1% summer design point is 92°F with a 78°F wet-bulb. That's air carrying a lot of water, and when it meets a cool surface, such as an air-conditioned wall cavity, a duct or a crawlspace floor, water condenses and mold follows.
Storms add the rest. NOAA's data lists a 50-year basic wind speed of 130 mph and a 100-year rainfall rate of 4.3 inches per hour for Charleston. Wind-driven rain gets past flashing and windows that keep out ordinary rain, and the wet materials behind them aren't always obvious until mold shows up.
Fix the water first
Mold removal without a moisture fix is a temporary job. Before you compare remediation quotes, find out:
- where the water came from: roof, plumbing, windows, ground moisture, condensation or a storm;
- whether that source has been repaired;
- whether the affected materials are dry now, and how that was measured.
A good remediation plan names the source and either fixes it or says who will.
What a sound plan includes
- Containment. Plastic sheeting and negative air pressure so spores from the work area don't spread through the house.
- Removal. Porous materials that are moldy, such as drywall, insulation and carpet pad, are usually cut out and bagged. Hard surfaces are cleaned.
- Drying. Dehumidifiers and air movers, with readings logged until materials are dry.
- HVAC. If mold reached the air handler or ducts, they're part of the job; running the system can spread spores.
- A check at the end. How the company will show the area is clean and dry before the walls close up.
Crawlspaces
Many Charleston homes sit over crawlspaces, and humid outside air vented into a cool crawlspace often condenses on joists and ductwork. Ask whether the company recommends a vapor barrier on the ground, sealing vents, dehumidification, or a combination, and why for your house.
Comparing quotes
- the moisture source and whether the quote fixes it;
- square footage of materials removed, by type;
- containment and air filtration;
- drying, with readings;
- HVAC cleaning, if needed;
- the rebuild scope and the license that covers it;
- how clearance is shown at the end.