I just discovered my recently renovated master bathroom with acrylic bathtub does not have a proper base installed under the tub. A contractor neighbor suggested I could cut an opening in the adjoining rooms' wall, to access the back of the tub, mix up some mortar, and jam it underneath once the mixture has hardened a bit.
What are my options to get this fixed, aside from ripping it all out. The last thing I want is a couple hundred pounds of water bursting out of the tub if it cracks.
What about drilling a hole, or cutting an access opening, and spraying some of that expanding insulating foam underneath for support?
TIA
pop eye jones@hotmail. com