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  1. #1
    Join Date
    Mar 2011
    Location
    Canada, Québec, Brossard
    Posts
    30

    Default Black spot on the foundation

    Hi,

    This is the second time I see black spots on a foundation. Can anyone tell me if this could be mold or what can be the cause of it?

    I am thinking maybe the exterior waterproof protection is deteriorated or a type of glue for the expended insulation? Simply mold?

    There were no signs of any fireplace near the spots.

    Bungalow
    1976

    Thank you

    Eli

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    Last edited by Eli Smith; 04-01-2014 at 09:38 PM.
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  2. #2
    Join Date
    Mar 2007
    Location
    Oregon
    Posts
    2,365

    Default Re: Black spot on the foundation

    It sure looks like mold to me. Is that a north side or another area that would be cooler or damp? I'd likely write it up as potential mold which is beyond my scope. Further evaluation from a specialist, etc, etc.


  3. #3
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: Black spot on the foundation

    It was black mold yesterday, April 1.

    Mould needs food. Concrete by itself doesn't support growth like that.
    We need clear pictures.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  4. #4
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Black spot on the foundation

    Combination of air leakage at sill plate bringing in dirt and condensation forming creating staining. Top of foundation wall not insulated and coldest area is at top of foundation which is most likely above grade.


  5. #5
    Join Date
    Mar 2012
    Location
    Lansdale, PA
    Posts
    876

    Default Re: Black spot on the foundation

    Looks a bit like sprayed on asphalt.


  6. #6
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: Black spot on the foundation

    Second photo shows a lot of white staining on floor joists. Also noticed rust stains below black staining in the first photo.
    As to staining being mould you would have to lift a sample and have it tested to confirm.

    In my opinion its not mould.


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