A large (130x40cm) section of plaster removed itself from the brickwork when
I removed some wallpaper. I am going to replace it with plasterboard and
was wondering the best way of joining the two sections. Will plasterboard
joint tape do the trick ?
Are you sure the rest isn't also about to fall off?
I suspect the hardest part will be getting the plasterboard surface
level with the existing plaster.
You are unlikely to get a clean enough join to just tape across.
If you are hoping to get away without reskiming the wall, you could
try bonding coat to fill the crack to within a couple of millimetres
of the final surface, and then use finishing coat or some other filler
you are comfortable with to bring it to the final level and finish.
Of course, really you should replaster, but I assume you are trying
to avoid that.
You'll probably get a better result having a go at wet plastering it even as
a first go. At only 40cm across, you should be able to get a flat surface
because you can use a wide float to cover the entire width. I had a similar
patching up to do (not as long, though) and it went surprisingly well.
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