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After a water leak I need to re plaster two areas of a wall. The largest areas is about 80 square cm's. The plaster is drying out well but where it is an old house with uneven walls, the plaster in some areas is up to 5cm thick.
Is it worth padding out the deeper parts with some wood and/or filler first? Never done plastering before but its inside a large cupboard so doesn't need to be perfect.
Can board out msot of the way with gypsum board
bonding plaster first ..... lot more like cement.
Then finish it with a skim of finishing plaster
if you hit it with finishing plaster thickly you'll get slump and shrinkage + will take forever to dry if ever
Deep gap filler or cut out a neat aperture and panel up with plasterboard.
It originally line plastered?
Either way make sure wall and edges of old plaster are wet before plastering so as to avoid too much suction. By wet I mean give them a soaking with a large paint brush a few times. Don't fill in one go. At 5 cm do 3 layers. Letting it more or less go off in-between. Obviously a fresh mix each time. Works for me but not sure about if it's lime as when I had to do some repairs to lime I used a line putty Sharpe sand mix.
Bonding plaster is a good call but involves buying two bags. Multi purpose will do the trick if you're not worried about perfection
I have some quick drying patching plaster that says its paintable. Will that be ok over any board or plasterboard?
I'd try a fit a bit of plasterboard to largest area you can. If you dot and dab it then you should get it pretty level. Just need to fill round the edge then its an easier skim. You might even be able to just easifil the edges and not bother with a skim.
Browning still used?
I have some quick drying patching plaster that says its paintable
How long have you had it? It goes off. After 6 months, ordinary plaster sets about 3 times as fast as normal, so quick drying will probably set before you've finished mixing it!
Only had it for a week. It was all I could find at the time to be delivered.
It says once mixed its workable for 30 mins so was planning on doing small areas at a time.
was planning on doing small areas at a time
That's a good approach. Use each area to build up your understanding, in thin layers. That's how I learnt (DiY, plastering up after moving a door). Lots of advice on the internet. Get the mix on the wall, let it stiffen a bit then trowel it. Don't over-trowel, after a certain amount of working it becomes more difficult to get smooth. It's much easier to get it flat if it's all the same thickness, so try to build up the layers so that the final one is about 3mm. Make sure your mixing bucket is properly clean from the previous mix, as any set plaster acts as a catalyst and makes the mix set too fast.
Thanks for the advice. Ordered some plasterboard too so I can use that as a base before plastering over the top.
Can mix multi finish with sand to create browning ,when set skim over
DO NOT put browning on plasterboard ( I am a plasterer) For that depth, I would dot on plasterboard. if you want; PM me and I will give you my email and you can send pics and I will talk you through the steps I would take.
So I've managed to cut two pieces of plasterboard that fit into each area well. The plan now is to screw them to the wall and plaster over the top. The wall behind is quite uneven red brick so should I put anything behind the plasterboard before screwing it to the wall? Or just screw it on and fill around the edges?
No need to screw it to the wall. Just make sure you have removed all of the dust from the brick and put several large blobs of plaster onto the brick and then 'stick' the plasterboard on by pushing it onto the blobs and pressing it down so you get the plasterboard at the level you want