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  1. #21
    Senior Member Rank = Nanasai Mike Bass's Avatar
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    Feb 2019
    Long Eaton
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    Also people forget to take into account the thickness of the walls & insulation, depth of base suddenly make that big hole you dug suddenly MUCH SMALLER than you originally thought
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  3. #22
    Senior Member Rank = Mature Champion samp09's Avatar
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    Oct 2019
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    Quote Originally Posted by Mike Bass View Post
    Also people forget to take into account the thickness of the walls & insulation, depth of base suddenly make that big hole you dug suddenly MUCH SMALLER than you originally thought

    Very true this, my base is about 25cm thick, then it was levelled out with a self levelling compound which lost some depth too, then the walls have insulation and fibreglass, across all 4 walls that works out a loss of about 30-50mm depending on which wall as the window wall has thicker insulation. All makes a big difference!

  4. #23
    Extreme Koi Member Rank = Jussai NickK-UK's Avatar
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    May 2015
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    A note about ponds - if the pond is near a fence and the sides are raised - just keep it under 60cm above ground. That way you're less likely to be subject to planning regulations. If the components of the pond (ie paraga etc start getting near the top of the fence then you're starting to move into planning implications - just as sheds are.

    If you're digging down - think 45. That is any foundation or building or wall needs enough soil to support the soil supporting the wall/foundation. That means if you dig 1m down immediately up to the edge - the soil for 1 meter the other side is no longer supported. The deeper you go, the more likely the infall and it is a safety issue for any digger. That includes anything on the other side of the fences.
    Keep the time between excavation and build as short as possible - when you excavate that last bit to make a 90 vertical cut the clock is running. I had an infall with mine, not a big problem but lead to 1/2 a day of additional digging for two people. You don't want any vibrations either.
    You'll also want about 10cm between the edge of the slab and the block wall outer side. So the excavation needs to be sized accordingly.

    Insulation is a double edged sword. I've dropped (accidentally) 7.3N blocks onto the fiberglass. No dents or damage. However that's because the fibreglass is laid directly on the concrete and so the concrete provides the support required to prevent damage. Adding a squashy/dentable insulation would have meant the block would have gone right through the fibreglass.
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  5. #24
    Senior Member Rank = Jussai Twhitenosugar's Avatar
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    Apr 2020
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    I can attest to Nick's last point.

    I had a concrete block (that was meant to be holding a tarp down) fall around 2m into my pond when it was empty.

    I have insulation boards on the floor of my pond and the corner of that block smashed straight through the fibreglass.

    I was not pleased having to repair that patch as by that point in time I was sick of the mess and fumes having fibre glassed the pond myself.

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    13,000L fibreglassed raised pond with window


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