Home Improvement

Honestly, that doesn't look too bad. I'd say the plywood is filling in an area of concrete that was removed before. The smooth mortar stuff is self-leveling compound, the gray stuff is concrete. Is there any movement in the floor, and if you're planning on putting down tile, then movement is the enemy. In which case, I'd say tear the concrete out and rebuild the rest of the floor with plywood, screwed to the joists that are presumably inspected and reinforced if needed.

If you don't have time or money to do that, this could be used as is with some repair of the holes. Those cracks aren't really a show stopper, and depending on the flooring you plan to use, you might not need to do anything about them. The concrete debris in the walls annoys the shit out of me, though. And I'd fix whatever you've got going on over by the toilet, that looks grim.

So you already have down to the studs, if you have any kids this is what you had them for. Send them in with masks and sledge hammers to break the rest of it up and burry it in the back yard woods/brush/where you need fill but dont care about clean topsoil fill (assuming this is rural).

Obviously take this with a grain of salt because im not looking at it in person, but I cant see very much water damage to be concerned with from the pictures. Even if there are spots that are structurally comprimised from water damage, just cut the sood out and sister in new supports. Once you have the concrete out youll have a look at the sub floor. Thats guna have the most damage if there is any and will likely get replaced because why not you are this far in amd all it is, is some plywood. If any of the joists or studs are water damaged, just sister new pieces of wood. Once the remodel is done and done correctly, you will have zero reason to worry about further water damage or water damage spreading.

Its unlikely the floor has been cracked like that for long. Again if it were like that for a long time, you would feel floor joists bouncing, wood flaking away, and black mold errywherrr. Even if you dont see any mold, after you finish demo but before you do any work, spray everything down with a mix of bleach and water.

Use all the recommended materials. Pinching a penny on the wall materials or flooring will absolutely cost you a whole other renovation before you sell. Calk everything. Then caulk it again and keep on caulking every sign of wear.

All in all id say for how old the framing looks, its not in bad shape for its age. For a second opinion, other than yours and random internet peeps, just call local contractors/tile guys for a quote. Tell them you are broke as fuck. That way they dont come in trying to upsell you on stuff and will give you the bare essential needs which will give you a better idea of what does need to be replaced and what is good to remodel over.

Here's what I've done in the past and will keep doing in the future. Since we're already rebuilding everything anyway might as well just redo the entire floor.

The mortar bed and plywood are sitting on concrete? I'd say it depends on how robust the mortar layer is. If it's easy to remove, I'd pull it out and re-SLC the whole region, then thinset down a decoupling membrane before tile. You can get decoupling membrane with integrated heating wire if you want to get fancy. I've used ditra-HEAT a couple times and it was pretty idiot (me)-proof. You'll want unmodified thinset or their special stuff.

You could also probably pull out just the plywood and makeup that section to level with fresh mortar. If the existing mortar isn't falling apart, I don't think you need to worry about cracks.

Another consideration as you decide is what the floor will transition to - that may help you decide on what layers you'll want in the bathroom