Internal Wall Plaster Coat Missing

Discussion in 'Painters' Talk' started by wassupjg, Jul 22, 2021.

  1. wassupjg

    wassupjg New Member

    Hi, any help much appreciated.

    Upstairs room (semi detached) with outer facing wall has had damp issues in the past with mould - cause should be remedied now by problem roof tile and guttering issues. Doing some diy refurb many months later, I just applied (Dulux) Damp Seal to the wall which had been behaving fine up to now, which caused the underlying paint layer to bubble a lot. Scraping off a lot of the bubbling paint layers (wasn't plaster!), hope you can see from the pics I'm left with what I think is render which seems in strong condition with no crumbling, but hairline cracks all over which no doubt let moisture through. The render just seems to have been painted over the years, the quality of the finish has always been smooth and indistinguishable from the other plastered walls in the house, I wouldn't have known it hadn't been plastered. The paint on the render (with fetching floral design) seems to have left a smooth finish which all the other emulsions over the years have sit on. What's a simple but correct way to get the wall back to a normal white finish? Is there a render paint or does it have to have a plaster skim? Any insight greatly appreciated.


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    (looks damp but bottom right corner is dry)

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  2. Wayners

    Wayners Screwfix Select

    Really old emulsion (pre vinyl) the emulsion has degraded over time causing loss of adhesion and is that a skim over? That has failed to stick with the degrading old paint. See this all the time. Either don't go digging at it or you get trouble or get it back to good and start again. I prefer that.

    Scrape off top plaster and paint.
    Bodge orbital sander on vacuum with 80 grade and sand what you can off.
    Then apply gardz to seal.
    Wall smoother or plaster or wallrock lining paper.

    My estate built in 1960s has that type of yellow (cream) emulsion and paint and paper is falling off reveling yellow old paint that's a little chalky
     
    wassupjg likes this.
  3. wassupjg

    wassupjg New Member

    Thanks pal much appreciated, could Gardz also be a moisture barrier to help seal against any future damp ever coming through, or would a liquid damp proof membrane like this

    https://www.amazon.co.uk/gp/product/B00JAJLPDI/

    be better?
     
  4. Wayners

    Wayners Screwfix Select

    If you think it's damp best not seal
    Treat to fix or lime plaster with breathable paint
     
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  5. wassupjg

    wassupjg New Member

    Thanks, reckon I'll leave the damp seal as signs of damp are actually helpful as a symptom that there's a problem somewhere. Gardz is good for binding chalky surfaces, I have Bulls Eye 123 already but happy to get Gardz if needed, do you know if 123 is also good for these kind of chalky/dodgy surfaces?
     
  6. Wayners

    Wayners Screwfix Select

    BS123 is not the same as gardz. Get gardz
     
    wassupjg likes this.

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