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- 6 Mar 2009
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I have a damp problem - an arch-shaped stripe of damp (approx. 6" x 3') keeps appearing on an internal wall about six inches above an upstairs window.
The room was reskimmed about 15 months ago and there was no problem until about 5 months ago - it's a wall under a gable end with no gutter above it. The roof isn't old and is in very good condition (both tiles and mortar), window is uPvc and in good condition. There's an air brick into the roof cavity above it, but the shape and location of the damp doesn't seem related to it (and the ceiling is dry)
I can't see any problem with how the frame is sealed, but there have been a few dried trickles of dirty water from around the wooden plank in the opening above it (a remnant from the original wooden windows - similar dimensions to a skirting board, horizontally across the top of the window opening).
I've scraped off the efflorescence and painted with damp seal several times, but both damp and evidence of dripping/trickling water is getting worse. The house is currently empty but the central heating is set at 8 degrees.
Does anyone have an idea of what could be causing it (assuming the window frame is properly sealed)?
The room was reskimmed about 15 months ago and there was no problem until about 5 months ago - it's a wall under a gable end with no gutter above it. The roof isn't old and is in very good condition (both tiles and mortar), window is uPvc and in good condition. There's an air brick into the roof cavity above it, but the shape and location of the damp doesn't seem related to it (and the ceiling is dry)
I can't see any problem with how the frame is sealed, but there have been a few dried trickles of dirty water from around the wooden plank in the opening above it (a remnant from the original wooden windows - similar dimensions to a skirting board, horizontally across the top of the window opening).
I've scraped off the efflorescence and painted with damp seal several times, but both damp and evidence of dripping/trickling water is getting worse. The house is currently empty but the central heating is set at 8 degrees.
Does anyone have an idea of what could be causing it (assuming the window frame is properly sealed)?