Can anyone advise me about the sudden appearance of the outline of cavity blocks on my interior lounge walls. The outlines look like shadows on the walls and are dusty grey.
I want to redecorate and do not know what to do to ensure this problem does not happen again.
bibien,
In view of the age of your home it is unlikely that clips were fitted to retain the insulation slabs against the inner cavity. It is likely that there is a ventilated gap between the slabs and the outer surface of the inner cavity.
Realistically all you can do is to redecorate the wall as and when the block outlines become unacceptable.
end
bibien,
Clean a small area of the wall with sugar soap solution then apply a coat of emulsion over a small area to see if the block outline grins through.
If it does you will have to seal the wall with an oil based paint - again try a small area with white undercoat.
end
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!