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  1. #1
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    2,481

    Default Horizontal Black Line in Foundation

    Never seen anything like this. 1955, single story ranch home. At the right/front exterior foundation stemwall I found a line that had been painted-over. When I chipped a bit of the paint off, I found black asphalt or tar. Looked and felt like the stuff used for a T&G roof. Then, when I was in the foundation crawlspace area, I found another larger line in a different area.

    We do have some fairly expansive (adobe-type) soils around here, but there was no evidence of excessive foundation movement. Looks to me like it was originally poured this way. Seems to me that the seismic resistance of the foundation is compromised.

    Foundation was bolted at some areas, but I could not find any bolts in the area of the second two pics. The first two pics are at the exterior of a slab section, so bolting could not be verified. Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.

    Anyone ever seen anything like this before?
    Anyone have any idea as to why this was done?
    Any thoughts or suggestions? I will probably defer to a structural engineer, but I am still curious.

    Thanks.

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  2. #2
    Join Date
    Nov 2009
    Location
    St Paul, MN
    Posts
    1,628

    Default Re: Horizontal Black Line in Foundation

    I'd defer to a structural engineer. But, if I saw a poured foundation in a 1955 home in MN I'd suspect the foundation was rebuilt or the house moved to a newer foundation. Everything around here built in the 1950's is block.

    MinnesotaHomeInspectors.com
    Minnesota Home Inspectors LLC
    ASHI #242887 mnradontesting.com

  3. #3
    Elliot Franson's Avatar
    Elliot Franson Guest

    Default Re: Horizontal Black Line in Foundation

    Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.
    Mr. Alquist: I do believe that Mr. McCarthy is right.


  4. #4
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,549

    Default Re: Horizontal Black Line in Foundation

    Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.
    Mr. Alquist: I do believe that Mr. McCarthy is right.
    Quote Originally Posted by Elliot Franson View Post
    Mr. Alquist: I do believe that Mr. McCarthy is right.
    In which case, we can think of no good reason for the tar.

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

  5. #5
    Join Date
    Mar 2007
    Location
    Connecticut
    Posts
    1,828

    Default Re: Horizontal Black Line in Foundation

    When in doubt and poured the first part too low.
    Drink, Drink, Drink, Pour tar, Drink, drink, Drink, Pour concrete.
    Get er done bubba.
    Mabey Tar goes well with Asbestos!!


  6. #6
    Join Date
    Aug 2007
    Location
    Memphis TN.
    Posts
    4,311

    Default Re: Horizontal Black Line in Foundation

    Quote Originally Posted by Gunnar Alquist View Post

    . 1955, single story ranch home. At the right/front exterior foundation stemwall

    , I found black asphalt or tar. Looked and felt like the stuff used for a T&G roof. Then, when I was in the foundation crawlspace area, I found another larger line in a different area.

    . Looks to me like it was originally poured this way.


    might have been poured to raise the stemwall, like they originally poured it short.


    Anyone ever seen anything like this before?
    Anyone have any idea as to why this was done?
    Any thoughts or suggestions? I will probably defer to a structural engineer, but I am still curious.

    Thanks.
    .
    Moisture Intrusion Barrier between Concrete Cold Joint Pour.
    .
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  7. #7
    David Bell's Avatar
    David Bell Guest

    Default Re: Horizontal Black Line in Foundation

    Needed 1 more truckload before the long holiday weekend but, NOOOOO! the plant closed down!


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