On Monday, 28 May 2018 11:07:00 UTC+1, Tim Watts wrote:
On 28/05/18 06:44, Michelle Rossiter wrote:
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 its been painted before wallpapering. Will I be able to plaster
over it if I PVA it well? Or will it need to be reboarded?

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