What is this dark patch on my chimney breast?!

philkiel · 2 Dec 2015

Hi, about 2 years ago we had the whole house re-plastered and painted when we moved in, however this one single patch has refused to dry and the paint has flaked off. It's on the left hand side of my fireplace and I haven't a clue what's causing it!

Can anyone help identify it? It doesn't smell like damp or have any mouldy patches, it just refuses to dry properly.

Thanks

roy c · 2 Dec 2015

It looks like someone has had a blow lamp on it !!! Or one of the candles has burnt it!!

roughcaster · 4 Dec 2015

I reckon that's damp, maybe not to the touch, but something's coming through. Nothing shows up damp/salts, etc more than gypsum plaster. Was there an old firepace there when you moved in?

foxhole · 4 Dec 2015

Damp , check roof ,chimney, flashing etc.

scruffybiker · 13 Dec 2015

Most probably salts left behind from when fire was in use. I get it in my property. Salt staining on chimneys & one exterior wall in lounge. It flares up when humid/cooking or raining.

ree · 14 Dec 2015

scruffybiker,

the OP appears to have disappeared from his own post. But, FWIW, if you are having difficulties with soot penetration from a flue(s) then why not open a separate thread describing your difficulties on here or in the building forum?

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What is this dark patch on my chimney breast?!

philkiel

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