I am sure this has been answered here before but I am having trouble finding an answer that fits my situation (here or anywhere else).
Our shower is 7 years old. I am retiling the shower and I have removed the old green board (yes they used greenboard and it molded) and chisled up the tiles from the shower floor. The floor mortar looks in pretty good shape with only a few depressions from where I took up some mortar with the tile. Of course the adhesive is still mostly in place on the floor; I am not sure if it was mortar or thinset. The CPE seems to be in good condition as well.
Question #1: The only problem with the CPE is that they use what looks like roofing nails and they have rusted. I plan on removing those nails and replacing them with stainless screws. Is this required or is it a good idea?
Question #2 (main question): I would REALLY prefer to not have to re-mortar the floor pan. Can I chisel up the adhesvie around the drain about 12" out and then just apply the tile over the existing adhesive (using the the new adhesive to level out the depressions)? The idea being that the area I cleared around the drain would be a gradual adjustment to the original level of the bed. The tile on the edges (by the walls) would of course start off being a bit higher than the original tiles (because of the old adhesive).
If that is not viable I could chip away the rest of the old adhesive.
I don't advise you reusing this pan! You've ripped tiles off and more than likely compromised its integrity. You should rip the entire unit out down to the original substrate. There are some great articles on our "Liberry" that will help you along the way to rebuild this shower!