But the pipe and drain fitting need to be taken apart and replaced if necessary in order to insure that a leak won't undo your efforts at reinforcing the floor. Mold won't grow without moisture.

If you want to install a shower over a concrete floor, a fiberglass shower stall will work just fine. Ideally, you’ll already have a drain roughed in, with the pipe sticking a few inches above ...

The house I grew up in had floor drains in the garage and they were wonderful. ... Downstream from the box drains I installed a self-made P-trap using 90-degree fittings.