What you have there is what many would call an old fashioned mud job. At this point...rip it all out and start with the subfloor. Read up on your installation options.

can someone give me some information on this type of floors? I want polish concrete in my kitchen and epoxy in my bathroom. thanks \

Not sure what I'm looking at here. The mesh wiring is not rebar. I'm wondering if the previous installer did a mud bed for that bathroom floor. I would tear it all out, to include that concrete mess, all the way down to your plywood floor. Level the floor if needed and add a concrete backer board, 1/2". Install tile directly atop of the backer board.

You mean waterproofing PRIOR to installation of tile as well as during/after install? Yes, you have to build and waterproof the shower before a single tile is installed. Tile and grout are not waterproof, they are just the part that you see. Not a pro here, but to educate myself (after a shower disaster, and in order to make a better hiring decision when searching for new pro to fix bathroom), I read the shower chapters of the TCNA handbook, read waterproofing threads on this forum and the John Bridge forum, and checked out DIY books from the library. I wasn't intending to DIY, but it was very helpful to learn what building a waterproof shower really requires. There's a lot of bad info out there, so don't go digging around in YouTube videos, with one exception - I watched Sal DiBlasi's videos. I think he has another site with more info on it, but I haven't gone on there lately. Doing some research before talking to contractors will help you make a better hiring decision. You can order a downloadable version of the handbook for less than $40: https://www.tcnatile.com/products-and-services/publications/218-english-publications/188-handbook.html You can search for Sal's videos online: Sal DiBlasi, Elite-tile Company, in the Boston North Shore area. After you educate yourself, start interviewing contractors (not sure if you want a GC or if you are going to directly interview tile professionals). Ask this question: "How do you build a shower?" For your entertainment here is a story that illustates how hard it can be to find an excellent tile pro, and how vulnerable people are to GCs' hiring decisions regarding subs. When you do find an experienced and qualified tile pro, understand that on average a correctly built and waterproofed shower will be several thousands of dollars. Don't skimp on this by hiring an unqualified person. The chances of a leaky shower is far too great a risk. https://www.gardenweb.com/discussions/5725013/what-to-do-when-a-project-goes-completely-south#n=28 In my case, I hired a very expensive GC, who then hired a very cheap and unqualified tile installer. If you hire a GC, you need to find a way to ensure that he/she doesn't cheap out on the tile pro to increase their profit. I haven't found a way to do that yet. The only 2 projects where I had to hire a GC, they did this and it caused big problems. So, if you hire a GC, have an honest talk with them about who they are going to hire to build your shower. The tile pro is the most important sub that will be involved in your bathroom reno. The tile pro is the one who is in charge of building the whole shower. Sometimes a framer will frame the shower, but the tile po is ultimately responsible for the whole thing. Don't let a GC just tell you the person is qualified; you need to see that tile pro's prior work and ask them the question "How do you build a shower?" and here his answer for yourself.