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PostPosted: Tue Sep 19, 2017 6:24 pm 
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please see attached pics.

seems water stains but im not sure. i have checked loft and outside solid brick wall, i cannot see any water etc.

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PostPosted: Tue Sep 19, 2017 6:42 pm 
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Check for blocked gutters/downpipe. if those overflow then you will have exactly the issues you have.

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PostPosted: Tue Sep 19, 2017 7:05 pm 
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Check for damaged / rotten felt as well. Right down in the eaves inside the roof space.
Can also be caused by condensation rather than a leak. It's surprising how much water will come from warm air rising into the roof space, and condensing on cold surfaces.
Slates on a cold wet and windy day make an ideal surface for condensation to form.


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PostPosted: Tue Sep 19, 2017 7:30 pm 
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Let me add more info.

In Summer there were no stains they came back just last week. Same last year in summer no stains. But as soon winter/autumn starts we see these. This wall is external wall and if I touch it is so cold.

If it is leakage why it goes away in summer when windows are open.


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PostPosted: Tue Sep 19, 2017 7:51 pm 
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If you mean condensation, then to form condensation it needs a cold surface below the dewpoint temperature for the particular air humidity.
So cold evenings and so on can cause it.
It may well be that it's not that, but it's worthwhile being aware that it can be.

Normal leaks can happen any time.


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PostPosted: Tue Sep 19, 2017 8:03 pm 
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just checked outside.

There is no downpipe on that side of the wall. No blockage in guttering.

I will check the felt in roof.

It is solid brick wall. Not sure if it could be re-pointing but I cannot see this issue with other rooms in my house with this wall.

The stains are one the wall next to the windows.


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PostPosted: Wed Sep 20, 2017 7:55 am 
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loft looks fine. no sign of leakage.

not sure what to do.


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PostPosted: Fri Sep 22, 2017 7:31 am 
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We left full room windows opened for 2 days and stains are getting lighter. They will come back again as this is happening for last two years.

Not sure if I apply Zinseer bin and see if they come back or not?


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