Floor of my bathroom is leaking, and the roof of the room underneath is getting wet and soggy. There is a leak from the side ot the bath where it joins the wall. The floor of the bathroom seems very soggy and bath can move slightly down when pressed. I tried to seal the junction of wall and the bath, but because of small movement between the bath and wall, the seal does not work. What should I do? Should I change the floor of the bathroom. There is no leak from the plumbing (checked by the plumber)

You have to find where the water is coming from first... you can't do anything until that is done

Bathroom floors are not supposed to contain water. Why is there so much water spilled on to the floor? You seam to know where to water in coming from, but apparently you haven't been able to fix it. Sounds like a complete redo is in your future.

Jaz