Marks on inside of double glazing

annem · 15 Mar 2009

Marks keep appearing on the inside of the double glazed unit of one of the bedroom windows. To me, the marks look like an impression a textured cloth would leave. It seemed to appear when we had the cold spell, but it is not condensation. Sometimes the window is completely clear.

It is a small bedroom and a large son sleeps in it

so from time to time we do get condensation on the window overnight.

Condensation was a big problem in the same bedroom a while ago, but the problem was solved when I bought a dehumidifier.

Any ideas anyone?

diymadhelpout · 26 Mar 2009

was the window fitted with a vent? also how old are the windows?

annem · 26 Mar 2009

The windows are about 10 years old, and don't have vents fitted.
The other windows are fine, it's just the smallest bedroom which has the problem at the moment.

diymadhelpout · 26 Mar 2009

if the marks are definatly on the inside of the glass then the seals have blown i think. If you want to fix it i think you would have to get a local glazier or window firm in.

annem · 26 Mar 2009

Yes it looks that way.
OH priced up a sealed unit last week, just debating whether to replace the whole window so I can get to clean it myself - depends on the cost.

I can't understand why the marks are intermittent. If the seal had broken I would think there would be marks there all the time. I'll try to get a photo next time I notice it.

diymadhelpout · 27 Mar 2009

then again it might just be the humidity in the air as you said the dehumidifier worked.

annem · 27 Mar 2009

I can't understand why marks appear on the inside though. The marks are there now and its a sunny but windy day.

freddiemercurystwin · 27 Mar 2009

The marks/finger-smudges were probably made when the unit was being assembled and slight variations in the humidity/air conditions etc cause them to be noticed at certain times.

annem · 27 Mar 2009

Thank you both for your input.
It looks like we'll have to bite the bullet and replace the unit then.
Cheers

diynot

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Marks on inside of double glazing

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