Can someone please help me? Here’s a picture of my sister’s chimney breast:
You see those 3 marks on the top left of it, any ideas what they are?
She says, “There are three stains in all - the largest (the middle one) is approx. 230mm wide. They’re on the wall - that’s a chimney breast that has three vented pots for three fireplaces, none of which are in use (probably last used decades ago!). The old plaster (original lath and plaster, possibly 100 years old) was taken off and the wall plaster-boarded and skimmed in January so it was very definitely dry by the time I got round to painting it in August (!). It has two coats of bare plaster emulsion on it. The stains came through in a matter of days. They don’t feel any different to the rest of the wall - not colder or damper.”
I’m thinking some kind of soot/damp mixture from badly flashed chimneys… So: check for exterior damage, get if fixed, cut a section of plasterboard out, let it all dry well, seal it with some sort of chemical sealer (advice please…) fill with nicely shaped plasterboard, fill and joint the cracks properly, problem solving primer, repaint.
Does anyone have any other guesses?has anyone seen those stains before?
Thanks in advance,
Dave and Dave’s sister…