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Thread: Ufer?

  1. #1
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    Ufer?

    Working on a new resi build at the moment. The basement walls have been prebuilt and are setting on a crush/run gravel base. I placed a 5/8" grnd rod under the walls so that we could tie into the rebar. Come to find out, they wont be using any rebar, it will be fiber reinforced concrete. Should I just span a 20 ft piece of #4 copper or do you have any other suggestions. Thanks

  2. #2
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    I would just install 2 ground rods and call it a day.
    Rob

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    All responses based on the 2011 NEC unless otherwise noted

  3. #3
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    Quote Originally Posted by infinity View Post
    I would just install 2 ground rods and call it a day.
    I agree. Why make it any harder than it needs to be.

  4. #4
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    I would pull the rod and drop in 20' of #4 with enough extra to reach panel. Easier to toss wire in trench than pound/drive 2 rods IMO.

    Probably cheaper also.
    "Electricity is really just organized lightning." George Carlin


    Derék

  5. #5
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    Quote Originally Posted by jumper View Post
    I would pull the rod and drop in 20' of #4 with enough extra to reach panel. Easier to toss wire in trench than pound/drive 2 rods IMO.

    Probably cheaper also.
    I'm a little confused here. OP says basement walls are prebuilt (precast?) and setting on a gravel base... then says they will be using fiber-reinforced concrete. Exactly what is the fiber-reinforced concrete being used for? If basement slab floor, my understanding is it does not qualify as "foundation or footing".
    I'll never get there. No matter where I go, I'm always here.

  6. #6
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    Quote Originally Posted by Smart $ View Post
    I'm a little confused here. OP says basement walls are prebuilt (precast?) and setting on a gravel base... then says they will be using fiber-reinforced concrete. Exactly what is the fiber-reinforced concrete being used for? If basement slab floor, my understanding is it does not qualify as "foundation or footing".
    I dunno, I did not read real closely and thought there was a footer. Basement walls on a slab with no footer does not sound right.

    Yeah, slab does not count for an area for installing a CEE.

    I really only meant that a CEE is easier than rods to install IMO.
    "Electricity is really just organized lightning." George Carlin


    Derék

  7. #7
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    Quote Originally Posted by jumper View Post
    I dunno, I did not read real closely and thought there was a footer. Basement walls on a slab with no footer does not sound right.

    Yeah, slab does not count for an area for installing a CEE.

    I really only meant that a CEE is easier than rods to install IMO.
    The problem I have is convincing the AHJ there is 20'. He can see two rods and assumes they are 8' long, but doesn't assume there is 20' of #4.

    I went to a meter pedestal a couple of weeks ago to install the service, and the inspector passed the install, even though the rods were only 9" apart. Don't know who built it...(just a side note)

  8. #8
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    Quote Originally Posted by jumper View Post
    I dunno, I did not read real closely and thought there was a footer. Basement walls on a slab with no footer does not sound right.
    He said walls set on gravel base, so I don't think they set on the floor slab. Not familiar with the design, but I'm thinking the gravel serves as a self-leveling "footing". Likely a typical floor slab.

    I really only meant that a CEE is easier than rods to install IMO.
    I gathered that and agree. I only commented because I don't see a yet-to-be-poured concrete foundation or footing in the OP description.
    I'll never get there. No matter where I go, I'm always here.

  9. #9
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    Quote Originally Posted by Smart $ View Post
    He said walls set on gravel base, so I don't think they set on the floor slab. Not familiar with the design, but I'm thinking the gravel serves as a self-leveling "footing". Likely a typical floor slab.


    I gathered that and agree. I only commented because I don't see a yet-to-be-poured concrete foundation or footing in the OP description.
    Watched one being installed a couple of years ago. I don't see how it would last being set on gravel, but as usual, change frightens most.
    http://www.superiorwalls.com/pdf/Ene...n_Two_Days.pdf

  10. #10
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    Quote Originally Posted by Hv&Lv View Post
    Watched one being installed a couple of years ago. I don't see how it would last being set on gravel, but as usual, change frightens most.
    Thanks for the info link.

    Time will tell on it lasting...
    I'll never get there. No matter where I go, I'm always here.

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