Help with damp

Ryan91011 · 5 June 2017 at 3:09PM

A year after moving into our 1920s house we had the wall ties replaced, then a couple of months later I painted the outside of the house with standard emulsion paint. The wall has a pebbledash effect and so I needed to really work the paint in. A matter of weeks after the painting, speckles of damp appeared on the inside of the wall I painted, and has got progressively worse. Having read up on this I'm guessing that I've applied the paint to thickly and so the walls can't breathe.

Could anyone therefore recommend my next steps? Do I need to try and remove the paint and if so how?:huh:

I_have_spoken · 5 June 2017 at 3:37PM

It could be more cost effective in the long run to hack the pebble-dash off and get it re-done.

Was there any signs of the existing pebble dash 'blowing' and cracking like it needed replacing anyway?

TBH the only way I can think to get paint off brick/pebble-dash is to bead blast it

flashg67 · 5 June 2017 at 8:39PM

I can't see emulsion being able to retain enough moisture to create damp on an inside wall? I'd have expected it to have started coming off by now as it's not waterproof or designed for exterior walls. 'Proper' exterior paint can form a seal as it has different properties. Sounds like a coincidence IMHO

vw100 · 6 June 2017 at 10:29AM

Yes the bricks under the pebble dashing cannot breathe. The pebble dashing may have had cracks that are not visible unless you closely looked. Painting it has sealed in the moisture and dampness is coming through internally. You option may be to hack of the pebble dashing and then rendering or apply K rend. Will need to factor in scaffolding, noise, dust, and waste disposal.