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I have upvc windows & always have condensation inside the windows. Only time that I don't have this problem is in the summer months when the weather is fine. I have had the windows for the last 12 years. Is also in the corners of my bedroom on the outside wall & black spots on the ceiling. Any suggestions?

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This is caused by high humidity and difference in temperature from inside to outside. So in winter when you have the heater on, there is a reaction when the inside of the upvc is heated and the outside is cooled and causes condensation to build up. Very similar to when you are in a car and there is humid cold weather. The black spots are very possibly a fungus growing as a result of the high humidity. You need to introduce fresh air into the house possible with a small inlet fan.

Posted on Nov 18, 2009


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