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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Building Questions >> Curing damp ingres ... https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1390847674 Message started by londonman on Jan 27^th, 2014, 6:34pm

Title: Curing damp ingres ...
Post by londonman on Jan 27^th, 2014, 6:34pm

...or how I made a cock-up.

Sometime back I put in a new window but now realise that I cocked up the DPM. I should have wrapped it vertically up the inside face of the stone cill. But I didn't. So water gradually accumulates between the DPM and the stone cill and then pools onto the top of the dwarf wall and we get damp coming through the plaster.

I could Synthaprufe the internal face of the dwarf wall but would rather try and stop the water coming in in the first place. But cant really see a good way forward. If the existing DPM was dry then I could try applying a load of gorilla glue onto a second piece and sliding that in between the existing DPM and the stone cill. But it isn't. Expanding foam ?

Any suggestions very welcome. TIA

Title: Re: Curing damp ingres ...
Post by woodsmith on Jan 28^th, 2014, 7:49am

I wouldn't normally fit a DPM below a window, unless it's full length ( like French doors) they don't need one and it can be counterproductive. If the window has mastic to both edges and cill where it meets the wall plus a drip groove to the under side of the cill you shouldn't get any water ingress.