I have bought some old railway sleepers (very heavy) and I want to make a box out of them. I have bought the long screws to fix them together but I also want to fix the first one to the ground. I thought the best way to do this is concrete it in considering I am doing a patio now as well.
my question is this.
1. Can I simply pour concrete onto the compacted mud or do I have to have a sub base?
the reason I ask is that I am all out of hardcore and don't really want to buy some more unless I really need to
thanks again for your help