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  1. #1
    Join Date
    Aug 2009
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    Raleigh
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    105

    Default Deteioration of CMU foundation wall

    "Gravel" material on ground is what has come off block. House is 11 years old and pics were taken inside of crawl space. No signs of water entry. Localized to about a 15' section of wall. Sent pics to a PE I know and he's never seen this. Anyone seen anything like this before / causes?033 (Large).jpg030 (Large).jpg032 (Large).jpg

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  2. #2
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    5,005

    Default Re: Deteioration of CMU foundation wall

    Whats on the exterior in this location? Grading, soil type, driveway, exterior wall finish material?

    My guess is water even though there is no water coming through and/or bad block.


  3. #3
    Join Date
    Mar 2007
    Location
    Knoxville, TN
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    2,446

    Default Re: Deteioration of CMU foundation wall

    They look damp to me, but I wasn't there. I have seen this in much older homes, but they had moisture intrusion. The blocks just crumbled.


  4. #4
    Join Date
    Mar 2012
    Location
    Lansdale, PA
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    876

    Default Re: Deteioration of CMU foundation wall

    I have seen block deteriorate like that when saturated with water for long periods of time. Much of it has been old cinder block, but some was concrete block. I never say any that young. Possibly poor quality block or some type of acidic ground water.

    BTW, what is the red/orange material. That looks like deteriorated brick.


  5. #5
    Join Date
    Aug 2009
    Location
    Raleigh
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    105

    Default Re: Deteioration of CMU foundation wall

    Quote Originally Posted by Mark Reinmiller View Post
    I have seen block deteriorate like that when saturated with water for long periods of time. Much of it has been old cinder block, but some was concrete block. I never say any that young. Possibly poor quality block or some type of acidic ground water.

    BTW, what is the red/orange material. That looks like deteriorated brick.
    Exterior finish is brick. Grade is fair - sloped away but minimal. Buried downspout in this area. Soil in crawl was dry. Red/orange material is our wonderful soil. Looks odd in the photo.


  6. #6
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    Default Re: Deteioration of CMU foundation wall

    Buried downspout? That could be the problem either its clogged or the weeper tile is clogged/damaged.


  7. #7
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,248

    Default Re: Deteioration of CMU foundation wall

    Quote Originally Posted by Raymond Wand View Post
    Buried downspout? That could be the problem either its clogged or the weeper tile is clogged/damaged.
    Or it goes to an underground drain pipe to a discharge elsewhere. Down here (at least in many parts of Florida) the underground drain pipe goes to what many refer to as 'bubblers' - about a 12" x 12" catch basin which is used for the discharge end.

    Because those are intended to catch drainage and direct it to the pipe, they hold water ... and breed mosquitoes ... so I recommend cutting the bottoms out and creating a dry well under where it is placed.

    Rain water flows from it and out the 'bubbler', residual water in the pipe and bubbler seeps down into the dry well.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
    Join Date
    Aug 2009
    Location
    Raleigh
    Posts
    105

    Default Re: Deteioration of CMU foundation wall

    Here is what the VP of engineering from the National Concrete Masonry Association had to say about this:

    "First thought may have been sulfate attack, but if it is localized to only a portion of the foundation, unlikely. Given that the degradation is impacting both the units and mortar unlikely it is a material issue, but something environmental. Id go through potential chemical exposure with the owner. Is there heavy fertilizer use on the exterior at this location? Do they (or did they at one time) have termite treatment as some of those chemicals are pretty caustic and a little overspray could have resulted in this damage?"


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