31st Oct 18 | Back to blog
Chimneys suffering from damp are a common thing, whether in use or not, and especially being so open to the elements. Damp can occur because of the moisture and sulfates that combine to form weak acids that attack brickwork, lime and mortar joints. It can also be caused when a chimney is sealed and the moisture becomes trapped within. More common however is typical British rain, condensation or salts contaminating.
If the chimney pot is uncapped, this means rain can enter down the flue, through defective lead flashing’s or through the actual chimney wall its self.
Burning fuel in a chimney can often lead to condensation issues as the fuel burnt produces a large quantity of water vapor.
Salt contamination in the plaster of a wall can also cause damp. This is more common in older chimneys and it can be the result of coal previously being burnt in the fireplace. Coal contains salt minerals like nitrates, chlorides and sulfates that can migrate from the brickwork into the wall plaster. These damp patches can often worsen when the weather does.
There are several ways to identify whether your chimney is suffering from damp. Here are a few ways:
For more advice on any of the above contact us today to request your free survey.
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