Dug my trench for a small footing to build a dwarf wall, for a garden patio. 22M x 0.35 wide x 0.25 Deep works out @ 1.925 (Lets say 2) CubMt Going on the theory that 1.76 tonnes per cubic metre (Of which I have read online..?) I will need 3.5 Bulk bags? Is this correct? It seems a hell of a lot to me. Any one have any other calculations in comparison? Thanks.
Good point - They estimate a tonne bag to hold 0.75 - 0.8 in Volume. On this basis then 4 bags should be about the correct amount.
4 jumbo bags of ballast and 23 bags of cement should do you, assuming your 0.25 depth is the depth of concrete and not the trench.
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