I bought a house in April with horrible dropped ceiling like you find in offices. It was there to hide the saggy plaster ceiling, which sagged because the ceiling joists were too small. So, I tore out the lathe and plaster and replaced the ceiling joists with larger ones. The plaster walls of the room were already covered in drywall, but only up to the bottom of the dropped ceiling, leaving about a foot at the top with just plaster (cracked in some areas). My plan is to drywall the ceiling and drywall the top foot or so of all the walls.
1) In some places, there is plaster all the way up to the bottom of the joist at the edge of the room. Must be some of the ceiling plaster that kind of stuck to the wall plaster. Do I need to cut that ceiling plaster away to create space for the new ceiling drywall to tuck on top of the plaster wall? Or is it ok to bring the edge of the ceiling drywall up to, but not tucking over, the top of the plaster wall? I was thinking the latter, since I'll be adding a layer of drywall to the wall anyway. Plus, that would mean I just have to smooth out the plaster instead of trying to remove it.
2) In some places, the plaster wall is cracked and, in a few, there are small places where a piece fell out. Do I need to worry about that or can I just install the drywall right over it?
Anything else I need to know? All the videos I've watched online are just regular drywall how tos or drywall over plaster where both the ceiling and walls have plaster. Nothing about when just the walls have plaster.
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