Plastering a doorway, whats the gap?

[Joeylegend]

Going to block off a doorway and plaster board it, also taking all the wallpaper of this wall down to the existing bare plaster.
What gap do I need to leave, between the plaster board and the existing plasted wall in order for the plasterer to plaster over the existing wall and the plaster board on the blocked off door. I take it I do not leave the new plaster board flush with the existing plaster.

 

[Alastairreid]

leave the plasterboard level with existing brickwork.

 

[Joeylegend]

hi alastairreid, thanks

You mean then 'not flush' with the exisiitng plaster

 

[Richard C]

I’m assuming the doorway is in a block wall & is not stud? As sugested, you can keep the level of the p/board flush with the surrounding plaster but break away the edge all around the door to provide a good key for the new plaster; rough fill the join with Bonding plaster & tape the joins well before skimming the lot. The best method of reducing the chance of future cracking is to remove the plaster back to blocks all around the door opening by around 200mm, fit studs to the door opening so the p/board ends level with the face of the original plaster & fix suitably sized lump of p/board so it actually overlaps the blocks all around; use dot & dab mix on the wall & screw to the stud work. You may have to fiddle with the stud levels & p/board thickness you use depending on the depth of the original plaster. As before, fill any gaps between the p/board & original plaster with Bonding, tape the edges well & skim the lot.

 

[morrik27]

If your having the whole wall slimmed then you can have the plasterboard flush to the level of the existing plaster finish, (don't forget to scrim the edges, although the plasterer will do that as a matter of course).
If your just patching where the doorway is boarded over, then set the face of the plasterboard back about 3mm to leave enough room for the new plaster so that it is level with the original plaster finish.