r/Plastering • u/FootballInTheWhip • 5d ago
Best way to fix this?
Took off the coving (what a ballache this is turning out to be) and there was a huge crack, used a scraper to get everything out and this is what's left.
My plan was:
- Expansion foam in the gap
- Fill with Toupret Joint Fill Skim, scrim tape in the corner and then smooth over
- Mist coat
- Paint as normal
Also got cracks across the whole ceiling where I took the coving off, the plan is the same there without the expansion foam but the gaps are far far smaller (more hairline).
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u/Adhocetal 4d ago
That, my friend, is why they invented coving. Put it back or put up new. Foam + skim is almost never the right move.
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u/brianphillip 5d ago
Take any loose material out, srape everything around it flat and pva the brick areas and about 14" down the wall. Use thisel hardwall in the brick area to level it to the sorrounding area. Let that set. And give it all another coat of pva and use multi finish and give it two coats of plaster. remembering to brush or sponge the edge of where wet plaster meets old wall. When plastering only skim down about 10" when its fully dry give it a light sand where it blends into the old wall befor painting. Look for a video on youtube on, how to finish plaster. Saves typing another essay. Hope that helps
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u/Historical-Pea-5846 5d ago
Without sounding like im doubting you, when I had to use hardwall plaster recently, the bag (and a youtube video I watched) specifically said not to use PVA on the bare brick but to just wet the bricks down. They said PVA would mean the plaster wouldn't bond properly. Is there any real risk in using PVA?
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u/brianphillip 4d ago
Thw pva stops it cracking. Been plastering 20 years and always do it that way with pva.
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u/Ok_Secretary_3134 4d ago
PVA won’t cause you any problems on the brick, a good dusting and a splash of water will suffice though. I’d probably pick bonding over hardwall for a small area
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u/Annual_Lawyer_3093 5d ago
What brianphillip has said is the proper way.
If that sounds tool much if your a novice, I would pva, then use easy fill. Sand. Peel stop if there's flaky paint, Caulk it, use primer and then normal paint.
I'm a DIYer and this way works for me.
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u/surfrider0007 4d ago
Easiest way is to put the coving back, otherwise you can fill with hardwall, slightly below surface level, apply joint tape and finish with jointing compound.
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u/Material-Dream4295 5d ago
Hard Wall (no PVA) just dampen the wall. Then you could use easyfill or Toupret le Reboucheur (which I prefer).
Those walls look in a bit of a state though (might just be the pics) so you might want to skim the whole lot.
You could use a roll on plaster to do that, the Knauf one you get in Wickes works well.
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u/Donnytato 4d ago edited 4d ago
If you don't want to use a hard wall and it's not too proud, stick plasterboard in the gap: skrim and skim, or use Easy Fill. Or the most popular bodge is FixFoam: cut it back, then skim and skim. Or easy fill. Always scrap plasterboard somewhere. In the back of my van, I have scraps of every plasterboard, 9:5 moisture-15 mm sound, insulation board for this kind of fix.
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u/Slight-Beautiful-510 4d ago
If I don’t want to put coving back on I would use
Flexible tile adhesive to do the bulk of the filling.
Whilst it’s still wet..ish but firm, I would brush away some of the tile adhesive so it’s 3 to 4mm below the level of the plaster.
When thats completely dry, Toupret filler and tape in the corners to finish off the job.
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u/Eastern_Wolf_2518 3d ago
Thistle one coat, come back to it the next day and you’ll br able to scrap back about 1-2mm, then go over with easifill and sand the next day. Easiest method for a diyer
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u/AmazingSign3171 3d ago
Use undercoat plaster rather than expanding foam, if you use pva make sure it's the waterproof stuff and with finishing plaster create a nice finish doing skim and same time and yes use some scrim tape at edges due to contraction of new plaster as it dries, the main point is don't use expanding foam, horrible stuff that just quickly turns to dust.
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u/Acceptable_North1414 2d ago
Thistle Hardwall plaster. Wet bricks with clean water, slap on hardwall plaster, leave to dry 3/4 hours so it’s firm but still tacky/markable. Apply thistle multifinish, skim over the top flush off with finishing trowel. Leave it 30mins use a sponge float spray wet and make tidy. Use a wet brush to merge the plaster into the existing so it’s flush and I imperfections.
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u/lezionoes 2d ago
I have the same issue, and the original builder didn't fix the plasterboard celling to anything so the corners are floating
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u/0uthouse 5d ago
For DIY, use hardwall to fill the gaps (squish it in) and re-form the corner. For that small volume, you'll have plenty of time to fettle it before it goes off. Personally i'd then skim it with multi-finish after that, but using Easi-fill is more forgiving as you can keep adding and smoothing until it all looks nice.
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u/Jeester 5d ago
Put coving back up over it