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Mould after a leak: clean-up checks

Fix the water first, dry fast, then decide what you can clean yourself and what needs a professional.

24 items · 6 sections · home, health, cleaning

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Fix the water first (4)

  • Stop the leak or get it repairedClean-up without fixing the water means the mould comes back.
  • Renting? Tell your landlord in writing, with dated photos
  • Dry wet areas and items within 24 to 48 hoursThis helps prevent mould growing.
  • Run fans, open windows and use a dehumidifier

Decide who cleans (5)

  • Under about 10 square feet (a 3 by 3 ft patch)? You can usually do it yourself
  • Larger area or lots of water damage? Call a mould professional
  • Sewage or other dirty water? Call a professional
  • Mould near your AC or heating intake? Do not run the system until it's checkedIt can spread mould through the house.
  • Health concerns, like asthma or allergies? Ask a health professional before you start

Protect yourself (4)

  • Wear an N-95 respirator that fits
  • Wear long gloves
  • Wear goggles without vent holes
  • Keep children and pets away while you clean

Clean it (5)

  • Scrub hard surfaces with detergent and water, then dry completely
  • Throw out mouldy ceiling tiles, carpet and other porous itemsMould can be impossible to remove from them.
  • Do not paint or caulk over mouldClean and dry first, or the paint will peel.
  • Never mix bleach with ammonia or other cleanersIt makes toxic gas.
  • Ask a specialist about valuable or sentimental items

Check it is finished (3)

  • The water problem is fixed
  • No mould to see or smell
  • Check again after a few days and after the next rain

Keep it away (3)

  • Keep indoor humidity below 60%, ideally 30 to 50%
  • Run the bathroom fan or open a window after showers
  • Check for hidden mould if you still smell itLook behind furniture, under carpet and in wall gaps.

Written from www.epa.gov

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