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Thread: tying re-bar

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  1. #1

    Default tying re-bar

    I'm in the process of tying rebar for a slab floor and never even gave much thought to the spacing of the tie wire. I do know that ideally you would tie it together every where it crosses. The re-bar is spaced 12" apart on a 32 x 32 slab. I'm thinking that all the way around the perimeter, everywhere it is overlapped together and then every 4 or 5 feet should be adequate and that the idea is to keep it from shifting when concrete is poured... does anyone know of code or rule of thumb for where to tie rebar? This will be a 4" slab for a hydronic radiant heated floor

  2. #2
    Architect Spaceman Spiff's Avatar
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    For strength you need to tie rebar everywhere it crosses another bar, or every 6" on an overlap. As far as where to tie your tube, every 2' should be fine. All you need for the tube is enough to keep it from shifting when the concrete guys walk all over it.
    Spaceman Spiff aka Mike

  3. #3

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    For some reason that just doesn't sound right... that would be tying it in right at 1,000 places. Sounds like extreme overkill to me. That little piece of wire isn't going to hold anything once concrete is in place.
    Last edited by Randyj; 08-25-2009 at 09:22 AM.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default overkill

    Overkill is rebar spaced 12" apart in a garage floor. Is this a garage where you will be rebuilding army tanks? Even wire mesh is an upgrade for 99% of garages.

  5. #5
    I&C Engineer (mostly WWTP) Lakee911's Avatar
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    Rebar is cheap. More power to him.

  6. #6

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    Quote Originally Posted by Lakee911 View Post
    Rebar is cheap. More power to him.
    Fortunately I was given about 3,000 ft of rebar for this project. With the concrete thickness I'm using, and it sitting on top of styrofoam I think it will do just fine. Major thing for me is to minimize cracking ...and at least for a time part of the floor will be used as a garage. My big boat weighs about 8,000 lbs. don't think I"ll be trying to put it on the concrete tho'... but definitely will be rebuilding motors and working on all kinds of things in there. Definitely would like to park my work van there too. Actually, I don't know how much that big boat weights but it takes two trucks to pull it out of the water and it's heavy as heck.

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