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Mold after water damage: cleanup and safety

Mold begins growing on damp drywall, carpet, and wood within 24 to 48 hours after water damage. Exposure to mold spores triggers respiratory illness, asthma attacks, and allergic reactions.

Do this now

  1. Stop the source of moisture or water intrusion first.
  2. Dry out wet building materials within 24 to 48 hours using dehumidifiers, fans, and open windows.
  3. Wear protective safety gear (an N95 respirator mask, safety goggles, and rubber gloves) before cleaning mold.
  4. Throw away porous water-soaked materials (such as drywall, ceiling tiles, carpet padding, and insulation) that have been wet for more than 48 hours.
  5. Scrub non-porous surfaces with soap and water or commercial mold cleaners.

Health symptoms caused by mold exposure

  • Sneezing, runny nose, nasal congestion, and red, itchy eyes.
  • Wheezing, coughing, and difficulty breathing in people with asthma.
  • Skin rashes or hives.
  • Severe fatigue or headaches in sensitive individuals.

Step by step safe mold cleanup

For small mold patches (less than 1 square meter or 10 square feet):

  1. Gear up: Put on an N95 mask, eye protection, and long rubber gloves.
  2. Isolate the room: Close interior doors and seal central HVAC supply vents with plastic sheeting so spores do not spread to other rooms.
  3. Clean hard surfaces: Wash non-porous surfaces (tile, metal, glass, solid wood) with detergent and water. Scrub thoroughly with a stiff brush.
  4. Dry completely: Run fans and dehumidifiers until all surfaces are bone dry.

When to call a professional mold remediation specialist

Seek professional mold abatement if:

  • Mold covers an area larger than 1 square meter (10 square feet).
  • Mold is growing inside central heating and air conditioning (HVAC) ducts.
  • The water damage was caused by contaminated sewage or black water.
  • Household occupants have severe asthma, immune deficiencies, or respiratory illness.

... note "EPA mold guidance" Environmental health agencies (such as the EPA in the US) recommend complete removal and replacement of contaminated porous materials like drywall, as mold roots penetrate deep inside paper backing.