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Tanking

Joined
17 Feb 2009
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Location
Lancashire
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I am after some advice please.
I live in the middle of a row of about ten 1900's built terraced houses. The road is fairly steep.
Next doors (downwards) house has been empty for about 4 years, with the householder just coming back now and again to collect mail etc.
Anyway, he has now decided to move back in, for some reason he's now only noticed his walls are mouldy and, according to his girlfriend, the walls are wet through. They called on about 6 (according to them) DPC specialists and the odd one have said to them that the water is coming from next door (our house). Our house is completely dry btw and has no mould issues whatsoever. The DPC have suggested to them a damp course or tanking (all the row has suspended floors). I did tell the owner that he had pointing missing in various places which won't help his water issue as it was probably coming down his cavity and pooling underneath, especially in heavy rainfall. He obviously knew this as he had already ordered the scaffolding for the pointing to be redone.
His girlfriend pointed to the air bricks under our bay window (has as every house on the row) and she said that the DPC said that they were above her ground floor level, but, surely, because of the slope, then every house next to each other has the air bricks above the next house up. I even measured ours and they are definitely below our suspended flooring/joists.
My question is, when their house is tanked, would that form a barrier and then water would 'hold' at that underground brickwork at my house or even if their wall is tanked so far up? (I'm assuming that is how it's tanked). Also, would they be 'trying it on' if they sent some notification to share costs ( not that they have yet). Just to add though, that in my way of thinking, then I could go to the next house up and say the same thing?
Our house was pointed in the last few years and her builder who's doing the pointing noted that when I saw him.
Thoughts please
 
Hi J,
As above. Their house needs drying out first, then if there is still a damp problem it will show on their dry walls and indicate where it's coming from.
C
 
There are situations where a tanked wall and floor could potentially divert dampness to other parts of a structure, but these would be specific circumstances.

Insertion of a DPC in a party wall should involve serving a Party Wall Notice which gives you chance to include some control and safeguards.

If a neighbour causes dampness to adjacent properties there are remedies under environmental law, which the local council can deal with.
 

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