We have a large barn/shed that will partly become a pottery (well it is already, but with lots of whinging from the potter).
Main problem is the floor. It is rough concrete (previously a barn for animals, so roughed to give grip for hooves). In places it is thin, almost a hole through it, and damp comes up.
My plan was to lay DPM, then pour 10cm of concrete.
I know that the gold standard is to dig-out to firm ground then fill with hardcore, then pour.
Time and cost dictate against doing that. There would be tons of crap to remove. To potter doesn't want extended downtime.
Given that:
A) ground around my house is very solid - digging is difficult, you git rock and boulders just 6" down.
B) The existing crappy concrete hasn't cracked.
Is it daft to just lay 10cm of concrete, using fibre-filled concrete?