Triple Glazed Windows
Reduced risk of condensation
The lower U values of triple glazed windows helps towards minimising internal condensation issues as the heat is kept inside the building and typically stops the cold external temperature reacting with internal warm air resulting in condensation. However, the main cause of internal condensation is high internal humidity levels (tumble dryers/wet rooms and lack of adequate ventilation).
Internal Condensation
This is usually a ventilation problem and cannot be caused purely by the installation of heat-retaining double or triple glazing. By acting as a heat barrier and providing an inner pane which is considerably warmer than the outer pane, condensation may be reduced. Modern buildings are designed to eliminate draughts and do not have the natural ventilation that some older houses have with their chimneys and ill-fitted windows and doors. Houses which have been completely sealed by the installation of cavity wall insulation, loft insulation, double or triple glazing and draught proofing throughout are likely to become moisture traps. In such cases, condensation is a ventilation problem. Provided the rooms are heated normally, the solution will probably be found by providing controlled ventilation. When a lack of ventilation is suspected, the householder should consult a heating and ventilation engineer. In the case of the older, “unsealed” buildings, the dominant factor is likely to be the indoor temperature and additional heat.
External Condensation
From time to time, we receive enquiries about the appearance of external condensation on glass. This is a naturally occurring phenomenon which is more prevalent the more highly insulating your windows are and is not a fault in the glass or window. Moisture condenses out of the air onto a cold surface that is said to be below the dew point. The dew point varies with the air temperature and the amount of moisture it contains. Particularly in spring and autumn, the glass temperature can fall to a low level during the night and the dew point can be comparatively high in these seasons. The glass temperature can be below the dew point under these conditions and moisture can condense onto the surface.
Condensation Between Units
Condensation arising between the units can be caused by a poor seal when manufacturing. The unit breaks down the seal over time by allowing air in, which eventually breaks the unit. Glass can then be replaced without the need to replace the frame. Fill out the contact form and we can quote replacing glass if this occurs.
