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 Post subject: Strange marks on render
PostPosted: Fri Jun 01, 2018 9:26 am 
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Hi, I hope someone here can help me understand what's causing some strange marks on an external wall.

After heavy rain I sometimes get a strange orange/brown mark appearing on the render on an external north-facing wall - see picture. It's always in the same place. There's no evidence of damp internally, or water getting in at all. The marks then fade away over a few weeks, unless there's another bout of particularly heavy rain. Washing it or scrubbing it has no effect.

The property is new build (built in 2015), and the builder hasn't been able to work out the cause. He's suggested it might be "salts" coming through the render from the blocks. Does this make sense? I do think I can see the outline of the blockwork in the marks. But none of my neighbours (all built around the same time) have the same issue, and it's only at the one place on on our house.

Does anyone have any idea what's causing it? And what can be done to stop it happening again?

Apologies if this isn't in the right forum - if it's not, I'd appreciate someone telling me where I should be posting it.

Thanks in advance.


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PostPosted: Fri Jun 01, 2018 5:46 pm 
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Probably not the right forum, buuut looks to be some sort of rust stain coming though.

The builders should be able to hack off the offending area to investigate, depending on what they find :dunno:

But should be able to patch in that part without any noticeable joins.

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PostPosted: Fri Jun 01, 2018 6:12 pm 
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Moved to general as requested W~o


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