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Plastering & Rendering

Re-rendering a damp wall

Anonymous user 23/02/2024 - 3.27 PM

Hi, I have just moved into an old stone cottage. The gable end wall is rendered and looks pretty sound except for some hairline cracks in the masonry paint and there appear to be no other structural issues except rising damp. However, when we have heavy rain the water penetrates the wall and makes the internal plaster wet on the ground floor. Is it possible to just put new render on top of the existing to seal it ? Thank you.

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5 Answers

Lance Baker building & maintenance

Rating: 4.9 out of 5
Bridgend, Mid Glamorgan
If it's a stone wall, its unlikely to have a dpc. If its rising damp, it's best to hack off back to stone, then apply an sbr (waterproof bonding), followed by at least one tanking coat 1.2m up from bottom of wall. Render and plaster over this as normal. Hope this helps. đź‘Ť
Answered10 October 2019
2

CAULFIELD ENVIRONMENTAL SOLUTIONS LTD

Rating: 5 out of 5
Benfleet
Hi Yes it is possible to apply over the top. We would prep the walls accordingly including a fungal wash. Anti-crack fibre mesh would be applied to stop any cracking reoccurring and bind together. We would then pin this if needed and skim. After this coat has dried we would cover with primer and a pre-coloured silicone based top coat to a colour of your choice. This would stop damp or moisture penetrating your walls and also has low maintenance self cleaning properties. I hope this helped and if anymore information is needed please let me know. Luke
Answered10 October 2019
1

Anonymous user

Hi I wouldn’t imagine the water is penetrating the render have a look at ur damp course and see if it’s damaged in any way kind regards
Answered10 October 2019
1

Anonymous user

No you need to go back to the brick where the crack is and tender that area
Answered10 October 2019
1

Anonymous user

Yes it is possible to go over the top of existing render as long as sound under.
Answered10 October 2019
1