The short answer
Safety First
Turn off power to the affected rooms before you touch anything. Floodwater can carry hidden hazards, so wear rubber boots, gloves, and a mask. If you feel unwell or see signs of mold, stop and see a doctor if needed.
Open windows and doors to create cross-ventilation. Use fans or dehumidifiers to speed up drying, but only after checking that the power is safe. Keep children and pets away from the work area until it is clean and dry.
Remove Damaged Materials
Cut away and discard saturated drywall, insulation, and wallpaper that cannot be saved. Floodwater soaks into porous materials, and leaving them in place promotes mold and structural rot. Check how high the water rose and remove wallboard at least 12 inches above that line.
Take out baseboards and trim if they are swollen or warped. Save any salvageable wood for cleaning later. For large areas of damaged drywall, consider hiring local water damage pros to handle the removal and disposal safely.
- Wear a respirator when cutting drywall
- Dispose of contaminated materials in sealed bags
- Take photos for your records before removal
- Label salvaged items for later cleaning
- Check for hidden water in wall cavities
Wash and Disinfect Walls
Mix a mild detergent with clean water and scrub the walls from top to bottom. Use a sponge or soft brush, and rinse with clean water. For walls that were exposed to sewage or contaminated floodwater, apply a disinfectant solution after washing.
Follow the disinfectant label instructions for contact time, usually a few minutes. Rinse again and allow the surface to air dry. Test a small area first to avoid damaging paint or finishes. Keep your shutoff valve location written down for future floods. Policies vary, and your insurer decides what is covered.
Policies vary, and your insurer decides what is covered.
Dry Thoroughly to Prevent Mold
After cleaning, dry the walls completely within 24 to 48 hours if possible. Use dehumidifiers, fans, and open windows to lower humidity. Mold can start growing on damp surfaces quickly, so act fast.
Know When to Call the Pros
If the floodwater was deep, the walls are heavily contaminated, or you notice mold growth, you may need professional help. The pros have the equipment to extract water, dry structures, and clean thoroughly.
They can also inspect for hidden damage and advise on what to keep or replace. For extensive cleanup, check related services like flood damage cleanup or structural drying and dehumidification. Act quickly, because delay increases the risk of mold and further damage.
Need help right now?
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (617) 404-2753Frequently asked questions
Can I clean floodwater off painted walls myself?
Yes, for minor flooding with clean water, you can wash walls with detergent and rinse. But if the water was contaminated, use a disinfectant. If the drywall is soaked through, it often needs replacement, so you may need professional help.
How long does it take for mold to grow on wet walls?
Mold can begin growing within 24 to 48 hours on damp surfaces. Dry the walls quickly using fans and dehumidifiers. If you see mold, clean it with a mild detergent and disinfectant, and fix the moisture source. For large mold areas, consult a mold professional.
Should I replace drywall after a flood?
Often, yes. Drywall that has been saturated loses strength and can harbor mold. Cut it at least 12 inches above the water line. If you are unsure, a water damage inspection can help determine what is salvageable.