what to do with shower hole
We just installed the shower base in our basement bathroom. The plumber had us leave about 6 inches of space around the drain pipe when we poured new concrete to patch the slab, so he could wiggle the pipe to fit into the shower drain (which is done).
What can we fill this gap with so we don't get moisture coming up from under the house?
The plumber didn't want us to fill it with anything, especially not anything non-flexible like concrete.
What do you normally do with this gap? We still have access to this area but not for long (drywalling pretty soon).