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3 foundations poured last week. Timber rising

Discussion in 'Building' started by 2019, 27 Aug 2019.

  1. 2019

    2019

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    Any tips on concreting large bases. I would do a few a year however 3 last week, 1 my own, gave an uncle a hand with his own plus seen one other get done the same. We shutter all sides in 7x2 timber, install the radon barrier on top of the radon barrier, plastic risers for holding the steel mesh on the slab. We'd score in some 3x2s from one side to the other every 8ft . This is so we can get a pull on the concrete with some straight 4x2 planned timber. Strong and straight. They are good for pulling! Everytime we pour the concrete, the timber that's screwd in from side to side seems to lift up with the concrete. Lifting about 10mm which is frustrating. We do manage to get the base level however it's giving us more work for pulling once we remove the timber and fill the gap and pull the highish parts. Anyone have any tips to save on extra labor with these timbers rising!
     
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  3. bobasd

    bobasd

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    you dont say what size the pour is or its thickness nor what its for.
    the 7"x2" shuttering should, of course, be fixed down with A. - concrete shuttering pins or B. - long pointed stakes.
    i dont understand how you are tamping the pour and if you have set 3x2's the width of the slab.
    more info is needed by me at least.

    if you are trying to start making a living in concrete work i might be able to help you a little?
     
  4. 2019

    2019

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    The 7x2s have been secured with rebar sank into the ground and don't move. The 3x2s are screwd in front side to side and are level for tamping on. These 3x2s are slightly lifting when the concrete is poured and they are going off level with up lift. This is my issue. How to keep these timbers from not lifting so when tamping, they stay level. Is there another method.
     
  5. ^woody^

    ^woody^

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    Post a picture or something, I can't understand any of tha.
     
  6. 23vc

    23vc

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    How’s it rising if it’s screwed to the 7x2s? Do you mean it’s flexing in the middle?
     
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  8. Notch7

    Notch7

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    Pressure from concrete underneath I reckon.

    Screws into end grain wont hold much
     
  9. catlad

    catlad

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    Maybe use a few bolts and dog toothed washers.
     
  10. catlad

    catlad

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    I'm still not sure I understand! why not tamp it level off the 7x2"s ?
     
  11. Alastairreid

    Alastairreid

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    Use timber the same depth as the shutter to form the screeds, then the concrete wont get under it and make it bow up.
     
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