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gbj_tester
Yes.
Were working out coverage from a 20kg bag.
Goalposts have moved anyway, Its a formula I should have to hand really.
20kg gives 4m2 at 3mm thick
20kg gives 0.8m2 at 15mm thick
I now need to find the coverage for 10mm thick. So we can work out how many 20kg bags we need.
I think 11.7mm would be 1m but then the next sum doesnt work so I dont think im working it out right, or even close.
Im multiplying the mm by 3 and dividing the m2 by 3.
Flippin contractors!
I'm going with 1.1m2 per 20kg at 10mm deep.
Ive drawn a graph and everything.