I have 33m2 of patio are to lay patio slabs on, one are is 9x2.4 (this has a concrete base) the other 5x2.4 this is on a scalpings base. I have tried to work out how much sand and cement I need bulk order using your calculators, but I'm confused. I was going to work on a 6 to 1 basis for my mix. But...
