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Brick mould/fungus issue

flakeybricks
in General Construction Issues

Featured Replies

Hi, I've got a fireplace that looks to have poor ventilation, and no fire in it.

I've recently noticed there is a white mould growing on the concrete floor.

Does anyone know what it could be and whether it is ok to wipe up, or whether there is some other issue that could be causing it.

Thanks, Adam 

IMG_20240609_155238.jpg

It looks like efflorescence to me - crystalline salt deposits. Crush some and it should turn to powder. It's caused by the presence of moisture though, so eliminating that would be the long-term solution (as it would be for mould too).

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