I want to fit a platerboard ceiling onto false joists in a kitchen, the false joists are secure to the original joists. The spacing of the joists does not match a full sheet of plasterboard, do i need to cut the full sheets so they meet on the joists, or can i have joints of the plasterboard between the joists ??
It is always better to have the seems of plasterboard on a support. I have seen it that the installer as put a floating (only supported by the drywall) board at the edge seam of it. (generally that area will show a crack due to some flex) any way you best bet will probably be to cut the length of the drywall to meat you joists and leave the sides (finished edge) uncut.