VELFAC 200 - Condensation on your windows; Exterior condensation; Internal condensation; Condensation between glazing panes

7
Condensation on your windows
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oor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.
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.