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Another screed calculation... for 26m2... doh

Discussion in 'Building' started by Mr Chibs, 13 Jul 2020.

  1. Mr Chibs

    Mr Chibs

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    Just wondering if you knowledgeable folk could tell me if I have this correct.

    26M² of screed needed at 75mm depth, sitting on 100mm kingspan.
    Looking at 4:1 mix.

    After trawling around trying to find a calculator (can't find the one that used to be a sticky)
    I have come up with the following:

    Grit sand 1.5m³ = 2400Kg in weight.
    Cement .5m³ = 30, 25Kg bags (seems a lot of cement to me)!

    Does this sound correct, or have I been a dunce!:oops:

    TIA
     
    Last edited: 13 Jul 2020
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  3. SpecialK

    SpecialK

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  4. jono_h

    jono_h

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    Isn’t that 3:1?
    4:1 would be 1.6 and 0.4?
     
  5. Mr Chibs

    Mr Chibs

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    I don't know :cautious: in honesty, as I find m³ to Kg bloody confusing.

    Just used the calculator previously mentioned.

    Come in at:
    832Kg cement
    2486Kg sand

    37 bags of cement! It's going up!:?:
     
  6. jono_h

    jono_h

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    Not sure about that calculator - it makes it a total of 1.95 m2, but then says you’ll need 0.49m2 of cement and 1.95m2 of sand. That’s a 20% contingency.
     
  7. Mr Chibs

    Mr Chibs

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    I've looked at this again, and it's talking m³ not m².

    If it's to be believed then it's as previously stated, better have three shredded wheat:eek:.
     
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