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I'm doing a patio project in my garden, it's got a bit of a gradient and i'm laying sleepers to level it.
There's a 12" difference between one end an the other, so I'll have to dig out at one side and backfill at the other. Is it OK to put crush n run/hardcore straight on top of grass?? Bearing in mind it's going to be covered in hardcore then compacted?
I'm presuming the lack of daylight would kill the grass??
Secondly, can you make a 4:1 cement mix using the grit sand I've got a jumbo bag of?
Best to remove the 'vegetable' soil, and get down to the sub-soil (Otherwise weeds will continue to grow, and there may be subsidence)
4:1 is more like a weak mortar mix, that could be used in brick/ block-laying.
You need some larger aggregate in there. See a site like: http://www.diydoctor.org.uk/projects/mixing_concrete.htm for details.
Depending on quantities, you could get some concrete delivered like this: http://www.easymix-concrete.co.uk/readymix-concrete.php?a=watford&kw=Concrete&gclid=CjgKEAjwnfGbBRDlxoHrl6uikyESJAD-nzCFnnhM1Te1RKUpzxtg79GS9bhoTtVCE1s7TS6sOb3LfvD_BwE
Depends on how many bodies you are disposing of