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So if used 8 bags of cement would I need about 3/5 of the 0.5sqm ballast? Think I've calculated that right. And I'd just need to chuck cement, ballast and water in a cement mixer? Thanks for the advice so far, as you can tell I'm no DIY expert!

It has a damp proof membrane as everywhere I looked for info it said to use one to stop damp rising through the concrete. Is this not right then? The base is for a hot tub to go on, and one of the requirements for the warranty to be valid is a very good base so I took no chances!

Hi, I've come looking for some straight answers, my research online has left me with many different, confusing and generally contradicting answers. Can anyone give me the definitive answer to my question? I have a 2m x 2m x 30cm hole dug in heavy clay soil, inside of this I have built a wooden...