Cpartist, where were you in 2012 and 2015? :) If the question was asked implying that people who weren't here in 2012 or 2015 might be interested in the info, I hear you, IF the person pulling the thread up had asked a question or was looking for new info. But that's not what happened. A brand new member chimed in. It's their only comment on this site and it was a comment trying to show how knowledgeable they are. However to answer your comment. I was here in 2015. :) And I've been a member since 2010.

Thank you Dawna and Sjhockeyfan for your kind words. Apparently steam is produced when the warm air from the shower comes in contact with the colder air in the bathroom. I think this means that less steam would be produced if the shower were enclosed. We wouldn't enjoy the extra work of replacing the curb and re-waterproofing but it would be much easier than re-doing it after the tile is installed. I forgot to mention that there is a pocket door between the shower and toilet area and the rest of the bathroom. We could shut this door while showering but it wouldn't keep the shower as warm as it would be if the shower itself was enclosed. Sjhockeyfan, how did you like the way your angled shower door looked?

Sure it can be accomplished. Some thoughts: If the slab is post-tension, that's an issue. Cutting into slabs with cables is a serious consideration. If not then move on... At a minimum, the shower footprint section of the slab will have to be cut out and removed so the shower elevation can be lowered to achieve a curbless entry. That in and of itself is not difficult. The drain itself and the branch line connecting the drain to the waste line? Right now the tub drain itself is at a certain elevation and the tub trap and branch is pitched for drainage into the main waste line. If you're dropping the elevation of that trap down a few inches to achieve a curbless entry, then the entire branch line itself may have to be dug up and repitched. There's also the diameter of the existing tub branch, and if it'll have to be resized to accommodate the required diameter for a shower branch line. Having to resize the branch could be a big mess. And it also depends on how deep the tub branch line is buried...it may be well below the slab, which works in your favor. Or it might be right below the slab, or a part of it might actually be within the depth of the slab. The deeper the branch line it buried, the more it works in your favor. It gives you more vertical elevation to play with at the shower drain/trap. Without cutting into any concrete, the waste pipe at the tub stub out could be examined to see how far it goes down vertically into the slab and the earth below the slab before it runs horizontal. They may find that they have enough vertical at the drain to play with so they can leave the branch line as is, pour a new slab, and move on with the curbless. Or they may have no vertical to play with, which could turn the dream into a nightmare. Those are probably the main concerns your contractor is worried about; the amount of vertical he has to play with at the drain, and if the branch line has to be resized. If it's something you truly want to pursue, then you need to talk through the ramifications or moving forward with your contractor. One, to make sure your contractor isn't simply saying "no" because it's the easiest answer. And two, that you know you're opening a can of worms, you know the ramifications of moving forward, and that you're willing to pay the contractor to do the extra work that may pay off in the end with a curbless, or it may all be for naught. "Anything" can be done. But it might not be able to be done within your stated budget. Or perhaps it's not within the skill set, the level of knowledge, or maybe even the comfort level of your contractor.

Megan it’s unfortunately a really serious mess. I have to say I’ve been reading Houzz forums for years and have seen some really bad tile installs, and this is one of the worst, if not THE worst, I’ve ever seen. There’s just no way that what’s under that tile could be correctly done. It has to be completely torn out and redone from scratch by someone competent. It is true that the type of entry you want is more difficult than a curbed entry, and it will and should cost more because of the time and skill it requires. But this person is so incompetent that I wouldn’t let them redo the work even if you switch to a curbed entry. When it is being torn out, take the best pictures you can of what’s underneath, layer by layer. Also take excellent pictures and video before it’s taken out, and if any of the materials the installer used are still in your house, take photos of those as well. Get any markings or labels that identify the materials into the photos. All of this will help you prove the installer did not follow the TCNA standards Dragonfly showed above, so you can hopefully recoup anything you’ve paid, and get out of paying the rest. I would also find a really good tile installer (I’m sure you thought the first one was that) and see if you can pay an hourly rate for them to come look at this before taking it out. Ideally get something from them in writing about the quality and correctness of the work. I’m sorry you have to deal with this.