I have some staining on my chimney. When i paint over the stain, the stain reappears as if by magic. What is causing this stain and how do i go about getting rid of it.
Thanks in advance for any suggestions.
The flashing round the chimney needs replacing (probably got very thin and perforated). Then you can get stuff from Jewsons to spray on the stain before repainting. Been there (twice) just recently.
It's tar leaching through the chimney - get some stains top to paint on and then whatever paint you are using over the top of that
Either damp or tar from an open or other solid fuel fire. The damp really needs to be sorted out by finding the source. Not a lot you can do about tar. To stop it showing through fresh paint you needs to seal it either with a proprietary stain stop (not "stains top" B-) ) or an oil based paint that you have lying about.
Once you have the cause of the staining sorted overpaint with something like:
What feeds into the chimney? If its a boiler then it might be condensing water not a leak.
Is it a new installation? If so it might not have been provided with somewhere for the water to drain. If its an old installation and the problem has just happened then more likely a leak.
Peter Scott
Do you mean the chimney breast indoors? It's damp and creosote/tars penetrating the plaster. You can get paint that's supposed to stop it, but it will come straight through normal gloss and "stain block". Try and stop the damp if the fireplace isn't used, an airbrick to the outside and a vented cap is OK. Your best chance of a good cure to the problem may be to hack off the plaster, render with 1:1:6 with waterproofer, and skim.
The magic brown stain doesn't mean you have a current damp problem. It's usually the residue from old leaks that have been fixed long ago. Paint it with a standard oil based undercoat (or any other white spirit soluble stuff you have in the shed).
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