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  1. #1
    Join Date
    Jun 2016
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    Rubyvale, Queensland
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    60
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    Default Bar Chairs at what height for a 100mm slab

    Hi Folks, I'm in the process of boxing up a slab area for a 10 x 4m carport and I have Googled the question and it recommends 65mm for the height of the reinforcing mesh.
    The slab is to be 100mm thick and I'm getting 25mpa concrete and having the mesh at 65mm is that okay to prevent cracking.
    The carport is to house a Ford RTV trayback.

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  3. #2
    Join Date
    Jul 2008
    Location
    geelong
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    Default

    Sorry can't help with that. When I read the brief title thought you were making a bar out of a 100mm slab and wondering about seating heights.

  4. #3
    Join Date
    Jul 2011
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    In between houses
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    Default

    40 mm is normal for 100 mm

  5. #4
    Join Date
    Oct 2010
    Location
    NSW
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    525

    Default

    It must depend on variables like soil type because around here engineers always specify "top" for a single layer of mesh.

  6. #5
    Join Date
    Jun 2016
    Location
    Rubyvale, Queensland
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    Default

    How far down from the top?

  7. #6
    Join Date
    Apr 2018
    Location
    Nsw
    Age
    62
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    1,169

    Default

    40mm cover from the surface for an exposed slab

  8. #7
    Join Date
    Jul 2012
    Location
    Sydney
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    32

    Default

    The reinforcement in a slab on ground is not really structural and is usually placed in the centre of the slab for water protection.
    It does play a role in that it ties the slab together but a structural slab would have 2 layers as it resists forces in the 'sag' and 'heave' directions.
    Cover on reinforcement in contact with the ground having no plastic membrane would ideally be 65mm or so, membrane reduces this considerably.

  9. #8
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    Jul 2011
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    In between houses
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    Default

    Water protection?

  10. #9
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    32

    Default

    Quote Originally Posted by riverbuilder View Post
    Water protection?
    Steel in slabs will rust if not covered by an appropriate amount of concrete. Concrete Cancer

  11. #10
    Join Date
    May 2012
    Location
    Woodstock (Cowra)
    Age
    73
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    3,100

    Default

    Quote Originally Posted by riverbuilder View Post
    Water protection?
    I know what your thinking and I agree
    The person who never made a mistake never made anything

    Cheers
    Ray

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