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Condensation on your windows
Condensation appears naturally, when humid warm air meets cold air. Most people have experienced condensation on their
bathroom mirror, the same principle applies to windows of a house.
Exterior condensation. Due to the low-energy double-glazing used in VELFAC windows, condensation may form on the
outside. During colder months, the outer pane cools faster than the inner pane and moisture in the external atmosphere forms
small droplets of water against the glass. This kind of condensation is completely harmless to the window and will disappear
as the external temperature increases.
Internal condensation has to be dealt with to keep it to an absolute minimum, though it may not be completely avoided. It
forms when warm moisture held in the internal atmosphere cools against the glass and forms small droplets of water. Because
warm air can hold more moisture, condensation increases as the room temperature is lowered and improves as the tempera-
ture rises.
Heavy condensation indicates high humidity due to poor air circulation. A humid indoor climate is unhealthy for both people
and windows, therefore a relative internal humidity of maximum 45% during winter is recommended. There are three important
measures to combat condensation:
• Rooms should be aired thoroughly two or three times a day for at least 10 minutes, even when raining
• A consistent indoor temperature of 20-22°C should be maintained
• Good air circulation in all rooms should be ensured - leave internal doors between rooms open
Condensation between the two glazing panes. If condensation forms between the two glazing panes, the sealed double-
glazed unit has been punctured and must be replaced. Please call the VELFAC After Sales Service Department.
Did you know that...
• You must air new-build properties more regularly than old ones - this
also applies to refurbishments or extensions
• People give off approximately 2L of water every 24 hours - airing is the
only way to remove it
• Pot plants deliver most moisture
• Condensation increases as the room temperature is lowered and im-
proves as the temperature rises.
If condensation has recently formed, it may be due to:
• Recently installed windows which are completely air tight
• Installation of under floor heating
• New curtains
• Moisture in new houses - it may take as long as a year to dry a new house
completely
• The season - condensation is more likely to occur in autumn and winter.
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