How to prevent condensation on UPVC windows

Condensation on your new uPVC windows and be both concerning and frustrating however it's not always a sign that something is wrong. This blog post is designed to help you understand that causes of condensation on uPVC windows as well has tips and tricks on how to prevent condensation on uPVC windows.

Date: 24th April 2018
Author: Jack Devaney
Categories: Windows, PVC-U

Causes of condensation:

Condensation is moisture in the air turned into water. The warmer the air is, the more moisture it can hold, when its limit is reached and the warm air makes contact with a cold, non-absorbant surface, it becomes chilled and sheds the excess moisture in water droplets, usually seen on glass surfaces.


Allow the rooms warmth to reach windows by positioning the curtains slightly away from the windows.


Close doorways into the remainder of the house and keep a window open. Also, Extractor fans can help.


The prime cause for condenstaion in bedrooms is not allowing for the night time drop in outside temperatures. Extend the central heating programme or other heating system accordingly. Ventilate by opening the windows at least once a day to allow air-exchanges.


To stop moisture from travelling around the house, keep the door closed during and after bathing. Whilst bathing it is advisable to open windows slightly to aid ventilation.

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