I approve. Mostly because of the cat.

Oh it was an ordeal! We had no idea the shower was leaking until there was mold on the wall. I cut the drywall and it was like clay. The underlayment by the shower was so wet I could break it with my hands. Turns out the water was coming behind the wall. So aftet figuring out where the water was coming from, I sealed everything. I didn't care whether it looked nice or not. If it had an edge or a gap, it got caulked.

Baking soda and superglue, look it up.

Why does everyone these days want their bathroom to look like a soul-less hotel bathroom?

Very carefully! Lol

A regular dust mask from Lowe's or Home Depot would do the trick, but if you want to spring for a 3M half face respirator you can usually find one that has a combination particulate and vapor filter cartridge. P95 or P100 filters are your friend for anything cementitious you are grinding. Very occasional grinding with a dust mask will not be too bad, but repeated exposure damages your lungs. Just make sure to ventilate the space well and maybe try to use a shop vac to capture the dust as you generate it or even consider using water as you grind to cut down on dust even getting into the atmosphere. A respirator is an easy safeguard though in case you don't want to mess around with all of the other dust control systems. Make sure it's snug on your face though

Most sources say paper towards the warmer space

Did you remove the shower door or just go straight to caulking everywhere? The plumber recaulked around the shower but apparently skipped the door area.

Paper down. There should be a flap of paper that you staple to the joist to help hold the insulation in place until you drywall

Grout isn't waterproof, it is porous.

Should have led with the cat pic.

I mean, no waterproofing is going to be just as bad as laying concrete on top of.... *checks notes.....concrete board that's on top of foam and sand.

Part of me wants to post this to r/tile.... they'd have a field day.

Thank you! Is N95 sufficient or do I need a respirator?

Shame any comments on the actual build are this low down. Again, not doing this to shit on OP but just for everyone's general knowledge before they do something similar.

While OP says it was a "test", I can almost guarantee this is going to fail (how soon? who knows) due to a few glaring errors (and to your question, you should indeed have concrete as your base and then insulate, not vice-versa. Ditto on the concrete board).

Foam on sand - not rigid or dimensionally stable is likely to be the first cause of death as things settle. If not that, then likely due to the whole thing lacking any waterproofing. Water will permeate the grout/tile (expected in all showers), but without any waterproofing, it will then soak into the concrete, which will saturate, and then saturate into concrete board (And thus will be trapped by the plastic) and then ultimately fail.

Again, not really so much of a question of "if" but a question of when. With minimal use it could be a long ways off. But I'd bet the foam on sand base will be the issue first.

And bonus sketchy points for in floor heating in the shower without waterproofing and the above mentioned water sponge created with the plastic. Should actually be a risk as long as floor is dimensionally stable and cable doesnt get stressed due to failures/shifting...(see above)

It’s an engineered I-beam, from existing holes i can tell it’s empty on the other side but to fill the gap fully on the other side would require a lot of holes to spray foam into

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Cool, thanks. The second bat should be paper on top right?

Great idea. Capture from further distance and add some motion.

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Sorry I’ll do better as I gets older I promise

Wear a dust mask while grinding the grout! That dust is not good for you

You should have seen the toilet, sink, and bathtub.

They were avocado.

Tons of creative ideas on youtube search term: cinematic tricks with phone

Can't help this one off the top of my head though. These videos always spark ideas, though.

If you are mastering at 1080 and have a 4k cam like a gopro you could film from a distance that captures a start and end point of yourself, then use software to move in and across the 4k scene. Take some trial and error and good software to get it to play smooth.

https://www.youtube.com/watch?v=hEBjbSTLytk. There are more videos like this.