Condensation issue around bedroom window

ferry

Need some advice please
We're experiencing what appears to be lots of condensation around our bay fronted bedroom window.
We've had the felting changed recently on its roof in case it was a water leak bit but still the problem persists.
Last year I stripped everything back ,damp sealed the area and repainted but we still get dark spots around the window area on the wall.
Double glazed window all seens intact with no signs of leaks or blown seals.
Was thinking of trying a mini dehumidifier- will this be of any real help?
We've noticed that we dont get much sun at the front - hence we dont have the problem at the back of the house.

Any advice appreciated
F

ariba10

You would be better off with a standard size Dehumidifier.

There are plenty of posts here on condensation if you do a search.

Or have a look at this.

http://www.harfordsonline.com/downloads/condensation%20info.pdf

traineepensioner

Hi,

I think to need to ascertain whether the damp patch is condensation or penetrating damp.

Try this...Dry the damp patch out, with a hairdryer or fan heater, and form a circle of blue tack or silicon sealer on the wall. Cover this with a small piece of glass, forming an airtight seal between the glass & wall. After a few days, if you see moisture on the surface of the glass you have condensation. If moisture is on the inside of the glass you have penetrating damp (or rising damp if on ground floor).

HTH

Antispam

http://www.condensation.net/

glubalub

Hmmm the glass test is not absolutely conclusive as the plaster may be hygrospic if it has been subject to condensation for some time. One simple test is to check if the problem gets worse when it rains. If it doesn’t, it’s probably condensation. Damp proofing can actually make matters worse as it can stop water vapour passing through the wall to outside. De-humidifiers are not really a good solution. A better long term solution would be to raise the temperature of the inside face of the wall by dry lining. Batten out the wall and fill the spaces between the battens with insulation, fix a vapour barrier over the insulation and then plasterboard and skim.

ed110220

There are a few tell-tail signs of condensation in my experience. It is much worse in the winter when the walls are cold. In my case it only formed in the winter, and especially in cold but not necessarily wet weather - in summer it did not occur. It always appears worst on the coldest walls, such as if you have a spare room in which you've turned the heating off, and often behind furniture etc where air circulation is poor. I moved a chest of draws to find the wall behind it black with mould.

In serious cases, such as mine, the condensation formed little droplets of water like dew or the condensation you get on a window, but on my walls. Damp coming from outside won't form dew-like droplets.

A bay window would be prime condensation location as it is more exposed than other walls and therefore colder. It is also more of a problem in old (pre-1920s/30s) houses, that do not have cavity walls for insulation.

I found increased heating and extra ventilation helped but did not cure the problem entirely.

savemoney

Adding some insulation even if its thin like polystyrene wall lining can help also using paint that has anti mould properties. I try and leave gap on a cold wall to allow air to get to it. I did get problems in a builtin wardrobe and when OH put some up something against a cold wall removing that and allow air to flow helps. I alkso try and ventilate by opening a window if its not to cold even for an hour or so

ed110220 wrote: »

There are a few tell-tail signs of condensation in my experience. It is much worse in the winter when the walls are cold. In my case it only formed in the winter, and especially in cold but not necessarily wet weather - in summer it did not occur. It always appears worst on the coldest walls, such as if you have a spare room in which you've turned the heating off, and often behind furniture etc where air circulation is poor. I moved a chest of draws to find the wall behind it black with mould.

In serious cases, such as mine, the condensation formed little droplets of water like dew or the condensation you get on a window, but on my walls. Damp coming from outside won't form dew-like droplets.

A bay window would be prime condensation location as it is more exposed than other walls and therefore colder. It is also more of a problem in old (pre-1920s/30s) houses, that do not have cavity walls for insulation.

I found increased heating and extra ventilation helped but did not cure the problem entirely.