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Damp patch on new plaster after bricking up chimney

Posted by Antony Griffiths, on
I have bricked up a chimney and had the wall plastered. All of the wall has dried to a light pink finish apart from a one square foot area right in the bottom corner of the chimney breast. This area looks damp. Its not wet to the touch. I applied some paint to it but the 'damp patch' came through, this wasnt present before we sealed the fireplace. I have looked on Google and have seen a couple of comments such as an air brick should have been installed and that its possible that salts are leaching through. Are these correct or could there be something else, and how should I go about remedying this?
Karl Williams

Karl Williams

if the chimney is still open at the top you should vent it with an air brick or possibly a sliding vent This will provide airflow to the inside of the chimney. You can fit a vent to the chimney by drilling a hole in the front where it has been bricked up and fit a vent over the top Hope this resolves your problem Karl

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