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  1. #1
    New Member
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    Dec 2008
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    24
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    South Louisiana
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    1967 Ford 3000, 42 HP Diesel, 2WD

    Default Stumps under slab

    My son is planning a 30'X40' workshop with a concrete slab. He has cut down 3 pines from the site and one water oak. The trees range from 10 to 18" in diameter. He is debating whether to leave the stumps and place about a foot of fill over them, grind the stumps, or remove the stumps. Of course, leaving the stumps would be the easiest option but I was concerned about the stumps rotting and eventually leaving a void under the slab. The slab is being placed over sand---the entire area has about 15' depth of sand. Also, there is a 12" water oak which will be about 6 to 8 feet from the slab. I think that the roots could cause problems with the slab down the road. Opinions?

  2. #2
    Gold Member
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    Jun 2011
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    269

    Default Re: Stumps under slab

    Lots of rebar and concrete thickness??

  3. #3
    Veteran Member Tig's Avatar
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    Oct 2006
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    2,496
    Location
    The County, Ontario, Canada
    Tractor
    Kubota, B7100HST-D

    Default Re: Stumps under slab

    The price and/or effort of pulling three stumps is insignificant compared to the price and effort of building a 30 x 40 shop. I would remove them.
    Steve

    The best things in life are not things.

  4. #4
    Bronze Member
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    May 2012
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    58
    Location
    Ottawa, Canada
    Tractor
    Kubota B3300

    Default Re: Stumps under slab

    I would (and have) pulled the stumps under anything I build.

  5. #5
    Gold Member
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    Jan 2011
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    486
    Location
    Central, OK
    Tractor
    jd 1050 LS I3040H. CASE SC

    Default Re: Stumps under slab

    Unless you will have sufficient footings/piers to suppor the building and reinforcement to allow the slab to be supported on the foundation always remove any compostible materials. It is usually cheaper to remove than reinforce.
    LS I3040H w/ loader
    JD 1050 w/ loader and backhoe
    Case SC. 1952

  6. #6
    Elite Member 300UGUY's Avatar
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    Apr 2004
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    3,379
    Location
    Howell, Michigan
    Tractor
    Kubota L3400, Farmall H

    Default Re: Stumps under slab

    I had a backhoe remove the stumps when I built the barn. I would not build on top of the stumps, eventually it will cause problems.

  7. #7
    Veteran Member
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    Jan 2012
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    1,108
    Location
    Ma
    Tractor
    Kubota b2920

    Default Re: Stumps under slab

    Having burried stumps and built on top (just a shed), i can tell you that every piece of wood will become a void and lead to issues. Far better and cheaper to remove them now.

  8. #8
    Super Member crazyal's Avatar
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    Dec 2003
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    5,860
    Location
    Northern Vermont

    Default Re: Stumps under slab

    I would remove them. The last thing you would want is a void that could get filled with water that you'll need to deal with down the road.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  9. #9
    Veteran Member
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    Jul 2009
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    1,662
    Location
    IL
    Tractor
    B2710

    Default Re: Stumps under slab

    Quote Originally Posted by Don in LA View Post
    Also, there is a 12" water oak which will be about 6 to 8 feet from the slab. I think that the roots could cause problems with the slab down the road. Opinions?
    Roots don't seek dry gravel under a building, they look for moisture. I don't see how roots from a tree that far away could be a problem. If it dies from the construction you might want to take it down so it doesn't fall on the building, but if it lives, hey that's more oxygen in your yard to breathe.

    On the stumps I think grinding them down to the root line would be sufficient and less disruptive to the soil. If you pull a big stump, you're going to have to do a lot of compacting as you add the fill.
    Kubota B2710, New Holland CM274 front mower, Toro Zmaster ZTR, Ford 908 bush hog, New Idea manure spreader, Swisher trail mower

  10. #10
    Super Star Member Egon's Avatar
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    Aug 2001
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    17,574
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    Nova Scotia, Canada

    Default Re: Stumps under slab

    A few trees in the workshop may be handy for hanging stuff from!
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

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