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  • foundation slab

    Im confused by the instruction for 5.5" base. If I add 3.5" pea gravel it only leaves " for concrete and rebar. Am I missing something? Clive

  • #2
    Re: foundation slab

    Hi and welcome!
    Set your formwork so that you have 5.5" of board above the level of the gravel. Assuming you use 2 x 6's for the form, they should be more or less just touching the gravel bed for a 5.5" thick slab.
    Does that answer your question?

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    • #3
      Re: foundation slab

      Thx yes makes sense. Although 30 bags of mix at 0.5 cu.ft.per bag, over the base area of 42 sq.ft only has a depth of 4.25". Thx again. Clive

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      • #4
        Re: foundation slab

        IIRC, mine took 38 bags. Your problem was that you bothered to do the math
        Good luck!

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