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5

The edges of your drywall pieces must be on studs - at least two of them and preferentially all four. (some drywall guys will vastly disagree with needing 4 so not trying to start a war) But two is a must. Your drywall should end on stud or be butted up in the center with another piece of drywall. Either cut your drywall or add more studs. There is ...


4

Although difficult to see and you are not sure if you have exposed the base drywall, I suspect what you have is painted wallpaper. The drywall paper rarely comes off easily without taking some gypsum with it. Because you have described three distinct layers, you may have wallpaper that has been skim coated with mud or primer then painted. What typically ...


4

I generally agree with DMoore about butt joints needing to be on studs, but the reason is simply that you need to keep the two sheets from moving with respect to each other. For that reason, you could probably butt join over just the lath. If you can hit enough solid lath with drywall screws to securely anchor the sheet ends together, you probably won't have ...


2

Stiffness is one reason, but not exactly in the way that was mentioned above. That return will prevent waviness as viewed from the room. Also, raw edges are ugly, even if they return into the wall. They're difficult to caulk, too, as there's no real bond surface--the caulk just falls behind if there's a gap.


2

Skim coat is more reliable than magic paint, but no direct experience with that particular flavor of magic paint, just seen lots of problems in general with magic paint and wallpaper residue. The counterintuitive (at first) fastest (and thus cheapest when labor is a cost, however you count that cost) approach that's 100% reliable is to rock over it (you can ...


2

Assuming that this is a new 4 inches of floor on a ground level structure... No this is definitely not ok. Greenboard is mold resistant. It is, however, still just gypsum with paper over it. Neither is using pressure treated wood as a barrier. Why? Concrete wicks water. Any water near the area will be distributed to be brought into direct contact with ...


2

You don't have to tear out the tape, just sand or scrape through the high spots and skim it. The only problem with doing that is if you have a substantial length missing at the actual joint, say over an inch.


2

It might look sloppy now, but if they are conscientious when taping and finishing, that will not be a problem in the least. It really would only take one quick setting-type coat before taping to get even a 1 inch gap as ready for tape as any other corner. (Assuming there is blocking behind it to back up the compound - there should be, otherwise what is the ...


2

It's really up to you; there are pros and cons to either choice. Piecing in would be easier and quicker, but then you'd have a butt joint all around the shower to feather out. Tearing the rest of the drywall into the corners would look nicer (no butt joints), but would be plenty more work.


2

I'd tap the rest of the wall and see really how much you need to repair. From the photo it looks as though you will have another inch or two upwards and at least another inch going down. This is a really easy fix though. You can get a tub of mud (plaster patch) at any home improvement, hardware or even your local department store and even large grocery ...


1

How many dB of isolation are you looking for? The ideal would be to isolate the inside and outside from each other, which means offset studs and joists. The walls and floor could be filled with sand to achieve further isolation, if your building structure will handle the weight.... websearch home recording studios, many if the solutions for those would ...


1

This is most likely easily fixed by swapping the box out with a different style (Old Work Box) or simply running some screws into the side of the existing box if it's against a stud, depending on the situation. Pictures will help. Either way, it's unlikely that you will have to cut into the wall. a) Here is how to remove an broken electrical box: ...



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