DIY Doctor

Chimney Trouble or Rising Damp With Salts Around Chimney?!

Postby LBradders82 » Sat Feb 27, 2021 10:12 am

Hi, we moved into a 1930s house last July and knew there was some damp showing on the corners of the brace. We chopped off the offending plaster and had that thick, tar stuff painted on. We have since had a stove installed into the chimney but we seem to have loads of salts coming through (see pics). I tried using acetic acid to treat it, but it clearly hasn't worked. We don't know if this is an issue with this chimney or if this is rising damp from underneath? We have also seen bubbling of the plaster next to where the skirting is still off, on the face of the brace. We don't want to decorate the whole thing to have to tear the plaster off again, but struggling to identify the cause! Any ideas on the cause and how we fix it? Thank you!
Attachments
Bubbling above skirting.JPG
For context - bubbling plaster is just above where the skirting was
Bubbling plaster1.jpg
This is to the right of the stove, above the skirting
Salty damp 2.JPG
The right hand side seems to be worse on the salts coming through
Salty damp.JPG
You can see that the mortar at very back-bottom corner looks damp
LBradders82
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Postby stoneyboy » Sun Feb 28, 2021 10:17 pm

Hi lbradders82
If the buttresses of the chimney breast have a DPC in them the most likely cause of the damp is that a DPM has not been incorporated below the hearth.
Regards S
stoneyboy
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