I have a ceiling that originally had a wallpaper covering over the plasterboard. This has been stripped off and whilst doing so some of the cardboard has been ripped off with it leaving a rough surface. It? also looks like it?s been painted before wallpapering. Will I be able to plaster over it if I PVA it well? Or will it need to be reboarded?
From experience. I'd be inclined to get a quote to overboard and skim. Then work out if the effort and likely result in patching the existing would be worth it. And then factor in if any further cracks might appear.
Or, rip the existing down and board/skim. But factor in some grotesque mess, especially if it's an older home.
IIRC it was about £300 to overboard/skim a 5m x 4m room and takes a day. They've worked really well in my house, and the plasterer somehow got it to merge into ornate coving. Small gains in sound and thermal insulation too.
Having done exactly this:
Strip the paper.
Wash the paste off - this is VITAL - paste will not form a stable layer to paster onto. It is also an utter and tedious bitch to do. I found much could be removed with a steam stripper and scraper. The rest (or all, but it's harder) can be done with a "holey" floor cloth (the rough old fashioned mesh type), hot water and sugar soap (I have used Flash, but sugar soap does still a better job if you have it).
You need to wash, rinse, wash until the surface stops feeling slimy.
After that, dry, scrape off any loose paint, PVA and plaster.
Paper is a significant part of the strength of PB. But PVA can do much the same job.
NT
I meant strip the wallpaper. I was assuming that would come off clean (the PB being either skimmed or painted).
In message , Michelle Rossiter writes
Are we talking about large areas here, or just the odd patch? I had PB that had odd patches of the paper torn off, so filled with ready mixed fine plaster, which worked well. Actually worked better than expected, given that I have tried 'proper' plastering in the past, and failed miserably.
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