I had an opening in the garage ceiling because I needed to replace the shower tray trap.
I took a quick video but can't upload due to the size but I've taken some screenshots (ignore the play button in the middle of the pictures)
You can see water marks in the two joists you can, can't access...
Definitely plasterboard ontop of brick wall, finished off with a skim.
So do I cutout the bad section of plaster board and replace with cement board?
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The garage is underneath and has plastered unpainted ceiling, no sign of water damage but then again it is hard to see on an unpainted ceiling .
I think the tray may have dropped in the corner where the gap is the largest. Now getting a bit worried what state the joists must be in [DISAPPOINTED...
Too late lons, managed to get the final tile off but managed to crack the pipper.
Thinking to remove the next row up to see the extent of the water damage, I gave a little poke and went through the top paper layer, plaster and to the back paper layer which was wet!
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So on the advice received on here I decided to remove the first row of tiles.
After scoring the grout the first three literally fell off! The fourth one I'm going to tackle with the dremel.
It's wet behind there let me tell you! I think it's player board behind the tiles, there's a dark brown...
It's a brick wall and that's what's concerning me when you say repair it.
On a side note what's the best way to remove tiles without breaking them.
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