How was the entire shower constructed? Did you have it done or was it done prior to you? How old is the shower? Why the fan on the floor? Every and all changes in plane should be 100% silicone caulk as grout will always crack as the different planes move differently. Whether that is worth fixing or not depends on the rest of the questions asked somewhat.

Hey there! I put the shower in and its about 15-16 years old. i have the fan on the floor to blow air into the shower to help dry it when I am done LOL. I dont know how it was constructed however, what do you mean? I'm sorry I have someone do it. I know it was all taken down to the 2x4s, the whole house was.

These are the products that were used. I think the grout was primarily used and the caulk maybe in the corners where I was getting some mold, which I am still getting…

inside of the shower floor it measures 59" wide and depth is 31" depth, looks like most shower pans come in 60" length so that may not work...

Issues with 15 year old shower is what is behind the tile. Back then quite possibly drywall and you may have a hell pf a mess from moisture. You really cannot just replace a pan effectively. You may want to consider redoing the entire thing especially since you are seeing some mold and it maybe creeping our from the rear.

I wonder if I coud try something like this until I am ready to demolish the whole thing? https://www.lowes.com/pd/MAPEI-Grout-Refresh-8-fl-oz-Bone-Ceramic-Porcelain-Tile-Grout-Sealer-Squeeze-Bottle/50337190?cm_mmc=shp--c--prd--flr--google--lia--106--groutmortarandsealers--50337190-_-0&placeholder=null&ds_rl=1286981&gclid=CjwKCAjwhOyJBhA4EiwAEcJdcV3Wjoz8so5Iy9zlxJPMiYXtFi4iYYOjJitlBD2NARb-PkZzPpc4DxoC2MoQAvD_BwE&gclsrc=aw.ds

the reviews sound amazing

Grout is not what should have been used at all and I can bet you there is moisture behind the tiles and that is why they do not stick I think to really resolve the issue the shower needs to be redone and since you really have no way of knowing how it was done the first time there is no quick fix I am sorry to say..

Durarock is on the walls, we put a shower pan on the bottom and lined it with rubber, floor was mudded and tiled. All of this was done per code and inspected.

Found these photos from when I had the shower installed.

Cement Board is great but unless there is poly behind or waterproofing over the top it is not waterproof. Better than drywall and should be loss water damage. Sealing the grout only stops it from staining not cracking or getting moldy unfortunately.

I’m pretty sure u don’t have the gut the entire shower to fix the problem on the floor. I think I could take the floor tile out and maybe one row that runs around the wall and get the floor level. Y’all are so negative. I’m sorry I posted here.

Looks good, and I like the accent tile at same height as the window frame... :)

crunkin4justinrt: Your revision looks good. I'm not sure you were understanding the main point a few replies were making: Don't put grout in between surfaces that change direction. You need to use a flexible sealant in that situation. So that means a caulking at the bottom where the walls meet the floor, and also up the walls in the corners, where the wall changes direction. Each of the flat surfaces (or "planes" -- a wall, a floor, etc) can move just a little bit, so the joint needs to be sealed with a flexible material. Anything hard, such as grout, will crack. And in a shower area, will then let water in. Does this make sense? See image with the red lines indicating where the flexible sealant (caulking) should be applied.

Also, I highly recommend that you don't use a 100% silicone caulking. (Do your future self a favor). This is because some time in the future (we always hope it's many years!), caulking will need to be redone. You cannot put anything on top of silicone caulking -- nothing will stick to it, not even more silicone caulking. And it's my experience that 100% silicone caulking is a BIG PAIN to remove. It is a slick rubbery substance that you have to scrape off with a razor blade or use some toxic chemical to dissolve. It never just comes up in one big rope when you pull. So a ton of tedious labor is required to get it off.

One more point: if you have used grout in between the different planes, then it might be OK to put a flexible sealant over this. I'm not an expert, so you should consult one. But I'm thinking that this way, if there's sealant over grout, even when the grout cracks there's something on top that is preventing water from getting in behind the cracks.

That was nice!