I'm trying to put up a plasterboard ceiling between floor joists in a back room in a farmhouse to keep part of the beam exposed. What a job! The joists aren't all lined up and trying to cut the plasterboard to go between the joists is a nightmare. Is it safe to use an electric planer to take off a few millimetres here and there If I use a face mask? I know it is messy but it is being renovated!
Possible I suppose, but as you say messy and risky in the sense it will take it off really quickly, a plasterboard rasp is the tool to use, easy to use not as messy and only about a tenner.