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  1. #1
    Join Date
    Feb 2009
    Posts
    3

    Red face My driveway pavement is sinking!

    The pavement in our driveway is sinking. We have two heavy
    cars(Jeep and an SUV), we drive over these pavement everyday and
    I'm afraid it may crack very soon.

    I've already poured at least two bags of sand in the hole
    thinking it would stop it from sinking...that didn't work. I
    then emptied another bag of top soil into it to no avail. When it
    rains, the sand and dirt just get washed away out of a small
    space/crack at the end of the driveway. It's getting worse and
    I'm out of ideas on how to stop it from sinking further.

    Attached are some pictures. From one of the picture, you can see
    one pavement is about 2+inches below the others. I'm almost
    afraid to drive over them...but I've no other way.

    Please help/advise. Thank you!
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  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: My driveway pavement is sinking!

    It's difficult to say tell from here ....
    There may be an issue with the sub-base under the slab not properly done.... causing settling .
    Also considering the number of control cuts and the slope of the driveway ... it looks as though those control cuts had never been caulked. You may have rain water getting in and undermining the base under the slab.

    You might check the Yellow pages for a company that does " Mudjacking" to come and raise the sections.

    It looks as though there may be some patching of the concrete in certain areas as well.

    Just some thoughts.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Feb 2009
    Posts
    3

    Default Re: My driveway pavement is sinking!

    Thanks for the suggestion. I'll look into the mudjacking and maybe
    have a number of contractors take a look and see what they have to
    say.

    Thanks!

  4. #4
    Join Date
    Aug 2007
    Posts
    1,131

    Default Re: My driveway pavement is sinking!

    Are there any water supply or drain/waste lines running under this driveway?

  5. #5
    Join Date
    Feb 2009
    Posts
    3

    Default Re: My driveway pavement is sinking!

    Quote Originally Posted by ****hiller View Post
    Are there any water supply or drain/waste lines running under this driveway?
    I wouldn't know. I'm the second owner of this house and it's about
    20 years old now. But I'd think none. The only time I'd see water
    out of the small crack is when it rains.

  6. #6
    Join Date
    Aug 2007
    Posts
    1,131

    Default Re: My driveway pavement is sinking!

    That could happen if/because the ground underneath is water-logged from a leak in either a water supply line or a waste water/drain line. Surface water might not show up on a daily basis, but only when rainwater is added to the absorbency demand load.

    Or......it could happen if the ground/fill under the drive is comprised of clay. Not very absorbent and prone to somewaht unpredictable behavior.

    Something is amiss underneath the slab and simply mud-jacking it....may not offer a long term result. Impossible to say from here.

    Mud-jacking *might* work if the problem is/was a lack of proper fill or improper compaction of the fill before pouring the drive. Again, impossible to say from here.

    The city/local health department... should/might have records showing where the city supply and waste lines run on your property. I guess I'd check that out first. If there is a leaking supply/potable-water line under there, it wouldn't necessarily show on your meter because the leak could be prior to the meter. Ever see those pics on the tee-vee news where cavernous holes open up in streets because of water main leaks?

    Same thing can happen if your line to the sewer (or septic tank) is leaking. Slowly but surely it can/will erode the soil away.
    Last edited by goldhiller; 02-11-2009 at 10:26 PM.

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