Mould in your attic

During inspections I regularly come across mould in attics. Here is a short video showing a common cause and solution. They don’t spend a lot of time talking about it, however air infiltration into the attic is one of the biggest problems contributing to mould growth in the attic.

  1. Ensure that all bath vents are vented to the exterior and NOT inside the attic.
  2. Check that your clothes dryer vents to the outside and NOT inside the home
  3. If you live in an older home you should run a dehumidifier in your basement to help reduce dampness year round set to 45%.
  4. Insure that your attic door is sealed adequately to stop that warm air from the home getting into the attic.
  5. Insure that your soffits are not obstructed so that air can enter the attic from the outside and exit out of the roof vents up top.
  6. From the attic check that light fixtures and other protrusions are not letting air from the home get into the attic.
  7. Remember, your attic is not part of the conditioned space of your home and should be sealed from HVAC air and open to outside air movement.
  8. For small areas with mould you can sometimes kill it by mixing 1 part bleach and 3 parts water, and apply to the mold areas
  9. For professional mould remediation the cost in our area the average cost ranges from $3.50 to $4 per square foot


Below is a DIY video.


I have touched on just some of the key information. If you are in the greater Niagara/Hamilton areas, feel free to give me a call to schedule a inspection where I will provide you with an unbiased assessment of your situation.