What should be undereath the installed basement shower stall?
I am having our basement development worked by a contractor. He installed the 2 PC. Shower stall early in the development stage. He opened the concrete to install the pipes then put the 2 PC (base and wall) but it was left opened underneath. They are now doing the finishing and still they have not covered the underneath of the shower base with concrete. I am not sure what needs to be done with this and I want to get other's advice. Shouldn't this be finished with concrete? It is all dirt and stone underneath the shower base. Please advice.