I am purchasing my home from my deceased husband's family estate I have just discovered that I have a void under the bath tub. My home was built in the early 1940's . The void goes down to dirt! The tub needs to be replaced it is the original. I know I need to remove the existing tile and the build up made originally of plaster board and concrete to enclose the tub. I can cut down the wall between the tiolet and tub to accommodate a tad larger tub and incorporate the plumbing into that.