Damp ingress in victorian solid granite walls

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Jersey
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United Kingdom
Hi

First post on here, so bare with me please!

We live in a Victorian Town house, with solid, random granite walls. The outside has been rendered and newly painted (within the last year I would guess) and LOOKS in good condition. However, in our 2 front bedrooms, we are getting damp. Its in the 2 'outer' corners of the house. We are semi detatched, so one lot of damp is very near our party wall, and the other is the exposed front corner.


We have had 3 damp specialists look at it, and all have offered different solutions. Only one has attempted to even explain why we are getting it. Our roof and gutters look in good order.

I have made a very very uneducated guess, and think that we are getting it due to two raised 'columns' of render at the corners of our house. (Not sure if that makes sense, but its the best I can do!) I think that they are only for decorative purposes. Could these be causing it? At the very top, where they meet the roof, they protrude out from under the guttering, and they have no flashing on top of them from what we can see.

Any other ideas? Could this be the cause, and if so, can we add flashing without re-doing the entire roof? If you have had ingress problems with solid granite walls I would be interested to know how you solved the problem please.

(Am also concerned that our floor joists etc may be getting wet/rotten, but we can't see any evidence of this at the moment, as the damp doesn't seem to go as low as the floor)



Many thanks in advance!
 
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Hi, thanks for you reply!

What makes you say it is condensation? How would we know for sure?

My gut (and uneducated!) feeling is that is isn't condensation. I say this for a few reasons: the room that is the worst of all isn't an 'inhabited' room, it hasn't been slept or really lived in for over a year. It is literally a box room for us at the mo, until we get this issue sorted. Also, the other room (which is our master room) the damp is inside a built in wardrobe. I would have thought that it would be hard for moisture to accumulate there from outside of the wardrobe when it is mostly closed?

We don't get any condensation on either of the windows in these rooms, I would have thought we might if it was a condensation issue? Also, under the box room, in our lounge we have a small patch of damp developing above the picture rail. Again, this is the outside exposed corner of the building.

Thank you.
 
Where damp is showing, tape some aluminium foil to the wall, if moisture appears on the foil after a while then it is condensation.

The fact that it is in the corners of the room does point to condensation as that is where there is least air movement
 
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