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Green mold on external wall


captainhastings
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That's a lot of growth for short time. Does that wall sweat in cold months or run off from elsewhere? Have you stood planters/pots on there and used plant feed? Brush on Household thick bleach mixed 50/50 with water with cheap nylon bristled brush and leave. Good as any expensive fungicidal mix. Not cheap, but try Dulux All Seasons oil based masonry paint. NB

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Thanks folks for the ideas plenty to go at. The yard is below the level of the ground at the back and all three walls are like that where water comes through. I should have known 8 quid paint was not going to cut it. I will treat it with one of the suggestions and then maybe repaint it with a decent paint in spring 

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2 hours ago, captainhastings said:

The yard is below the level of the ground at the back and all three walls are like that where water comes through.

It'll always occur if you don't stop this first ! If that can't be stopped, algae will always grow in those conditions, whatever you treat the wall with.

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  • 2 weeks later...

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