Plastering - joint between brick and drywall

[uluru]

Currently got a wall with a chimney breast and recesses either side. We're constructing stud wall to block up the recesses so that the wall will be flush with the front of the chimney breast. Chimney breast is not very deep ~20cm and what we gain by having a straight wall with no recesses (it's a kitchen) more than makes up for the metre square of floorspace we lose.

So the wall will be brick, plasterboard, brick, plasterboard. How best to plaster the wall across the joints between the surfaces?

 

[Alastairreid]

Cut the plaster back on the brick a few inches tape then skim the lot.
Pva the old plaster.

 

[uluru]

When I say brick I mean bare brick, no old plaster remaining

 

[Alastairreid]

Just tape the joints, then a coat of bonding plaster before finish.

 

[uluru]

So board the recesses out so boards are flush with brick, tape joints and cover the whole lot?

 

[Alastairreid]

Yes! thats the best way to do it.

 

[joe-90]

When you get two different materials you get endless cracking down the joins. I'd put studding to build out he recesses clear of the brick and then board right across using large sheets. Then you won't get movement cracking.

 

[Alastairreid]

Well taped and a bonding coat makes cracking less likely but still possible.

Joes method would be the best though a little more work..

 

[uluru]

There'd be joints in the plasterboard even if we boarded right across, are these joints a lot less likely to crack versus the brick/plasterwork joint? The first method suggested would mean 3 joints (recesses can be filled by single plasterboard), second would mean a lot more as wall in total quite long. Are 3 brick/plasterboard joints worse than 6 plasterboard/plasterboard joints?

Not sure that boarding right across is practical anyway, the first brick to plasterboard joint is actually a brick pillar (so end of pillar is flush with wall in question) supporting an rsj above so constructing studwork would be problematic for that bit.