None - Damp walls

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Tue 21 Jan 2014 13:10
None - Damp walls - johncyprus
We have water leaking into the house around a window, help please!

On the ground floor we have a window and water is gathering above the lintel and dripping down the right side of the window especially ( and the left side a little ) inside the room. Above the lintel it is very very damp and the water is "dripping down " under the paint. There is also a 6" circle of damp which has blown and is about a foot horizontally away from the lintel and about a foot off the floor. I think the two are unrelated because the 6"circle is a foot away from the lintel and I don't see how it can have tracked. The house is 1950s cavity wall and the house had cavity wall insulation done three years ago and we've had no problems before.

I suspect it's water entering the outside walls then tracking across wall ties and dripping on the lintel but surely the cavity wall insulation would prevent that ; however I think the firm that did the cavity wall insulation were naff.

If I coat the wall with non permeable paint will that stop the water coming in? Any recommendations re product?

TIA
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Tue 21 Jan 2014 13:25
None - Damp walls - galileo

We had a similar problem, if water gathers on the lintel the recommended fix is to have a cavity tray inserted above the lintel to divert penetrating rainwater outside. The other damp patch may well be due to creep across ties, cavity insulation won't stop that and may even contribute to letting water across the cavity.

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