Hey, so I'm currently in the process of having plasterboard installed for a new ceiling however, due to it being a slightly older house 1 of the joists are slightly higher than the rest offsetting the plasterboard. Additionally the furthest piece of wood isn't even a joist bur rather a long piece of timber nailed to the concrete wall from above but this is even further off level from the rest of the joists.

As such the plasterboard is on a slight angle / tilt in these areas. Would it be appropriate to apply more plaster directly to the newly installed plasterboard to pack it out and level it? Or is there a better solution here?

Diagram of the issue for reference (not to scale): https://imgur.com/a/xZbqgGH

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jfknailedmymom t1_jdt9azb wrote on March 27, 2023 at 12:33 AM

#2,380,990

if it looks that bad, maybe shim it. putting texture on the ceiling will hide most of the imperfections though.

athermalwill t1_jdta7yr wrote on March 27, 2023 at 12:40 AM

#2,381,135

The best way to do it is to screw strapping perpendicular to the joists and shim all the strapping to the lowest joist. You then screw the drywall (plasterboard) to the strapping.

Scoobymenace OP t1_jdtbkfo wrote on March 27, 2023 at 12:51 AM

#2,381,313

Replying to jfknailedmymom (#2,380,990)

The one more central to the room (5mm offset in the diagram) isn't so bad however, the one at the edge of the room is and will mean the architrave will be off as well if not adjusted.

Joists should of been checked beforehand but time is tight so mistakes were made.