just looking for a little reassurance really - decorating the hallway in a house we have recently moved in to, The plaster coving has been done very poorly - very uneven, very visible joins etc. I was in 2 minds whether to remove and replace but knew if I didn't it would annoy me. The coving is plaster, I will replace with the polystyrene coving. As i started removing the coving there is quite a large gap between the sheet plaster on the wall and the sheet plaster on the ceiling - like an inch or so. I kind of expected the two to meet. There's no danger that the coving was helping support the roof sheets and by removing the coving I risk the roof sheets dropping?
No, the decorative cove molding is not supporting your drywall sheets. They'll be securely fastened with nails or screws.
I've seen this done before. Obviously the trim/coving can't hold drywall together, but if you're planning to put trim/coving up there's no reason to join the drywall or tape the corners. I don't recommend doing it that way, tho.
The nails/screws are hidden with mud before painting.
NO... simple huh? Trim does not support drywall.