Recovery is mostly a drying job
Mold on a wall is a message about water. The growth you can see is what makes the phone calls happen, but the moisture feeding it is what decides whether the problem returns next summer. This guide is arranged in phases, from the first hour to the finished rebuild, so that each professional comes in when the house is ready for them and nothing gets closed up wet.
Phase one: the first day
Trace it. Stand at the stain and ask what is above it, behind it and beside it. A bathroom upstairs suggests a supply line, drain or shower pan. A window or slider nearby suggests a failed seal or flashing. An attic air handler overhead suggests the condensate drain or a sweating duct. A damp band near the floor of an outside wall can mean rain is getting into the wall.
Stop it. Bring in whoever can end the leak, plumber, roofer, HVAC technician or window installer, before anyone treats the mold. Cleaning a surface that keeps getting wet is money spent twice.
Dry what you safely can. Once the electrical circuits in those rooms are safe, turn on the air conditioning and set up a dehumidifier or two. Mop or vacuum up standing water and carry soaked rugs, cushions, cardboard and papers outside. Don't aim a fan at visible growth; the airflow can lift spores into rooms that were clean.
Take pictures first. Photograph and video the source, the damage, the growth and any belongings involved before anything is cut out or thrown away. Jot down when you first noticed it and each thing you did. Planning a claim? Phone your insurer at this point and ask which records it needs and whether an adjuster should see the damage before work begins.
What NOAA's Gainesville station records
Two sets of figures from NOAA's engineering weather data for Gainesville are useful here.
For storms, the Gainesville data lists a 50-year basic wind speed of 120 mph (3-second gust at 33 feet), a 100-year rainfall rate of 4.5 inches per hour and about 10 freeze-thaw cycles in an average year. These are values engineers design roofs, walls and drainage around. Make a habit of a walk-through after any hard storm: ceilings, the corners of window frames, and the floor along outside walls.
For moisture in the air, NOAA counts about 2,137 hours in an average year at Gainesville with the wet-bulb temperature above 73°F and about 4,252 hours above 67°F.
Phase two: sorting out who does what
The Florida Department of Business and Professional Regulation licenses mold remediators who pass the licensing exam and have documented training in water, mold and respiratory protection. A mold remediator may not perform a mold assessment on a structure its company remediated within the previous 12 months, and a mold assessor may not remediate a structure it assessed in that period, with an exception for certain Division I contractors.
Before you hire an assessor or a remediator, look the company up with DBPR, write down its license type and number, and ask it plainly which of the two roles it is taking on your house.
The assessment. You want a written document, not a verbal opinion. It should say where the growth is, how far it reaches into walls, floors or ceilings, what moisture fed it, and what the cleanup ought to include. Every remediation bidder then prices the same thing.
The bids. Send that document to two or three remediators and ask each one to price exactly what it describes. Read each bid for these items:
- a sealed work area, usually poly sheeting with a zip door;
- negative air pressure through a filtered machine, so spores stay inside;
- porous materials like drywall, insulation and carpet bagged inside the containment before they cross the house;
- framing, subfloor and other materials that stay, cleaned and dried;
- how the company will demonstrate that the work is finished.
Ask every bidder to send proof of liability coverage and workers' compensation, and file the copies.
Phase three: drying and checking
Opening the windows is not a drying method; outdoor air can carry moisture back into an open wall. Real drying happens with the space closed, dehumidifiers and air movers running, and moisture readings taken and logged daily until the materials hit the target named in the plan.
Nothing new, no drywall, insulation or flooring, should go in until the opened area is clean, dry and free of visible growth. Get the final readings in writing. Then look into the cavity yourself and photograph it before the rebuild crew shows up.
While the remediation crew works, stay out of the containment. If you have to go into a damp room before they arrive, put on gloves, eye protection and a well-fitting disposable respirator, and keep children and pets away. Health concerns about exposure are a question for your doctor.
Phase four: the rebuild
Replacing walls, cabinets and flooring is often a separate contract from the remediation. Florida contractors either hold a state certificate of competency, shown by a license number beginning with C, which lets them contract anywhere in the state, or a registration, beginning with R, which lets them contract only in the local jurisdictions where they met competency requirements. Ask the rebuild contractor for its number and look it up with DBPR. Ask, too, which permits the rebuild needs and who pulls them.
After the crews leave
A few routines keep the same wall from growing mold again:
- When you travel, raise the thermostat a few degrees instead of switching the air conditioning off.
- Put the condensate drain and pan on a cleaning schedule with your HVAC company.
- Buy a hygrometer and glance at it the way you would a thermostat.
- Let bath and kitchen fans run until the steam clears, and confirm they discharge outdoors, not into the attic.
- Every few months, check under sinks, behind the refrigerator and around the water heater.
Last, gather the assessment, contracts, daily moisture logs, photos, invoices, DBPR lookups and any insurer letters into a single folder. If a buyer or insurer later asks what happened and how it was repaired, the folder answers for you.