In 2008 I remodeled my master bath with a custom tile shower. The floor of the shower is starting to show problems. Of which I feel are water retention related.
The Master in on the main level which is over a basement. Therefore the base flooring is of the master bath is of course a wood subfloor.
During the installation of the shower by the contractor I noticed they were putting the rubber underlayment of the shower pan directly on the wood sub-floor. When I inquired to the slope of the floor they stated this and that and many reasons not to have to have a pre-slope so I let them continue. I believe my issue now are a result of not having a preslope. Whether its related or not to the methods used during the construction I can't say for sure but the entire base of the shower needs to be replaced.
My plan is to attempt to remove the bottom 18" or so of tile on the walls and to remove the entrie floor, pan, drain and such. Then replace with a poured preslope, new liner, new drain, top level and new tile.
Among many issue to consider one I am trying to figure out before I tear into the shower is the wall. I anticipate I will have to remove and replace the 12-18" of hardi-board on the walls so I will be able to replace the shower floor membrane pan and such. When I replace the hardi-board on the walls I will have a seam. This seam is what is puzzling me. Should I attempt to remove tile above where I will actually cut the hardibacker? This will allow me to reapply a membrane product in an attempt to seal the seam of the new and old hardibackers. Or is there a better method..(hopefully asside from re-doing the entire walls!)