Damp patches on Party wall.


Postby tvs85 » Wed Feb 22, 2012 10:45 pm

Hey,
Ive got some damp which I can't work out where its coming from...

The back story:
So the wall is a party wall 9inch solid brick. Its at the back of the house and the wall extends into the Garden to make the garden wall. I've quickly tried to draw it out, hopefully this makes sense.

Untitled-1.jpg
My bad diagram...
Untitled-1.jpg (33.67 KiB) Viewed 947 times


On the floor above there is a chimney which does not come down into the kitchen. It's vented at the top and bottom, and I've stuck my hand in the vent at the bottom and it's bone dry.

Two weeks ago we noticed the dip on the party wall, so we re-capped the external 6-foot section of the garden wall, hacked off the plaster around the damp, and got my cousin (a plasterer) to put a sand and cement (with waterproof aditive). Tonight I had a another look and the damp has re-appeared about a foot above the the original damp.
I've just taken this pic now...
photo 2.jpg
Damp above the newly patched area.


The wall has had a damp proof installed, again with a sand and cement (with waterproofer) up to the normal height. All of these issues are above the damp-proof.

Further along the wall (away from the garden) there are a few very small (the size of a 5p coin) damp patches, which show themselves as efflorescence through the paint. see this pic...
photo 3.jpg


The Neighbours have got tiles all along this wall, so I can't see any sign of damp on their side...

Any help or thought would be much appreciated! I really can't work out where the damp is coming from!

Cheers,

Tom
tvs85
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Postby welsh brickie » Fri Feb 24, 2012 4:13 pm

the external house wall has mortar on the wall ties causing bridging of the cavity and showing damp on the interior wall.
Use a borescope inspection camera to see into the cavity.
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Postby tvs85 » Fri Feb 24, 2012 4:24 pm

The party wall is not a cavity its nine inch solid thick brickwork.

Cheers

Tom
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Postby welsh brickie » Fri Feb 24, 2012 5:11 pm

not the party wall, your house wall
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Postby tvs85 » Fri Feb 24, 2012 5:22 pm

The wall between the two houses, where the red arrow is pointing? That's a 9incj solid brick. So Is the external wall.
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Postby tvs85 » Fri Feb 24, 2012 5:35 pm

You mean the wall between the two houses, where the red arrow is pointing? That's solid brick, so is the external wall.
Thanks,
Tom
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Joined: Wed Feb 22, 2012 10:21 pm


Postby welsh brickie » Sat Feb 25, 2012 2:53 pm

then thats the problem the house wall is drawing moisture from the party wall.Remove the internal plaster back to the brickwork up to 1 metre away from the party wall and to a height of 1.5m.
Paint the brickwork with a buitumin paint and replaster with limelight.
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