Water tank slab

Discussion in 'Renovation & Home Improvement' started by Burramys, 2nd Nov, 2019.

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  1. Burramys

    Burramys Well-Known Member

    Joined:
    26th Jun, 2015
    Posts:
    792
    Location:
    Melbourne
    A water tank is being installed, 2000 litres, 2030 H X 780 D X 1680 W. This will be put on a concrete slab, which, due to the weight, requires compacting and other aspects done. The narrow design means that in particular the slab must support the tank without tipping. Quotations are:
    - one for about $500;
    - a few at $7-800; and
    - one at $1300.

    I will pay what is necessary to get the job done properly. While not mandated
    Domestic builder
    Licensed Concreters – Find Local Qualified Concreters - licensedtrades.com.au
    it seems to me that certification is advised. The slab may not subside for some time, making it hard to claim a remedy. Also, this is up to two tonnes of water, heavy. Interestingly, the amount of pressure under the slab is about half of that of an average adult while walking.

    I'm tending to focus on the $7-800 range quotations and see which one of those has the right certification. Advice on this would be valued. TIA.
     
  2. Angel

    Angel Well-Known Member

    Joined:
    19th Jun, 2015
    Posts:
    5,740
    Location:
    Paradise, Brisbane
    I would like to know about what strength reinforcing goes into the concrete slab. Is it a difficult site to access? Those quotes are more than 100% difference.
     
  3. Burramys

    Burramys Well-Known Member

    Joined:
    26th Jun, 2015
    Posts:
    792
    Location:
    Melbourne
    The site aka garden bed is nearly flat, good access, patio of bricks next to the garden bed. The soil is soft, fairly sandy, with a possible water table about 500 mm down. I discovered this when I installed a letterbox post, although this is about 60 metres away.

    My understanding is that a hole is excavated, filled with sand, then compacted. This allows moisture to drain. The concrete is reinforced, seems to be a standard method, 100 mm thick. The concrete is 100 mm extra on all sides clear of the tank, so a tank 800 mm deep has a 1000 mm slab in that dimension.
     
  4. Scott No Mates

    Scott No Mates Well-Known Member

    Joined:
    18th Jun, 2015
    Posts:
    24,320
    Location:
    Sydney or NSW or Australia
    2t of water over 1.9m², about 1KPa load.

    Slab sounds about right with F62 mesh on 30mm chairs.
     

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