You sound like you’re half way there but you can never beat experience. If you do it yourself then accept it will not be perfect. Like I said though 1.5mm and over can hide a multitude of sins. 1.0mm and below everything has to be spot on.
I would normally be in the same camp as everyone else on this, definitely not something for a novice to crack on with. First mistake is not applying a primer to the masonry, with a few different backgrounds this wanted doing. I can understand you wanting to get the base coat spot bollock, this...
If it’s no to lime plastering inside and out if rendered, build a stud wall away 50mm from the external then board and skim. Can insulate at the same time. As has been said before, gypsum doesn’t do to well with damp issues.
Number of reasons it could of cracked like it has been said. Lighting the fire wouldn’t of helped, can dry it out fast and shrink at the joints. Always better to over board and have the plasterboard cover the original cracks.
All depends on the man holding the trowel, everyone has their own set up. As I get longer in the tooth I’m looking to try and take some of the hard labour out of the process. They are good for the final trowel, never try to pull the corners in with them. If it works for you then happy days.
Unless it’s someone who knows what they’re doing then of course it’s gonna need a spread. Tile over the f**k*r to get over it could be another option. You would be mistaken to think some easi-fill alone will sort that out, moisture in the room will have that over time, will open back up for sure.
If you use expanding foam just make sure you don’t go mad with it or you’ll end up popping the tiles. Like Windy said it should of been sorted before it was tiled. Get the paper off and get the whole wall skimmed, use a thin-coat stop bead just before the tile bead. Will look better if you keep...
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