Where is the moisture?
On the inside of the glass? This is usually condensation caused when warm, moisture-laden indoor air meets the colder surface of the glass. It is particularly common during winter and in kitchens, bathrooms and rooms where clothes are dried indoors. Between the panes of double glazing? Misting or moisture within a sealed double-glazed unit usually indicates that the unit itself has failed.
Around the frame during or after rain? Water appearing around the joinery during wet weather may indicate a problem with external joints, glazing, decoration or weatherproofing rather than condensation. Although these can look similar at first glance, they require very different solutions.
Can improving the window reduce condensation?
Sometimes—but the cause needs to be understood first. Draught proofing can reduce uncontrolled air leakage and make a room feel more comfortable. However, ventilation still needs to be considered, particularly in rooms where moisture levels are naturally higher.
Double glazing increases the temperature of the internal glass surface and can therefore reduce condensation on the pane. It cannot, however, remove excess moisture from the room, and condensation can still occur where humidity remains high. Repeated moisture should not be left sitting on timber, paintwork or putty. Keeping these areas dry will help protect the joinery while the underlying cause is established.
What should you tell us before a survey?
It is useful to know where and when the moisture appears. Photographs showing both the wider window and the affected area can help, along with details of the room and whether the problem occurs during cold weather, after cooking or bathing, or specifically when it rains. If the window is double glazed, let us know whether the moisture appears on the room-facing surface or between the panes.
At STILE, we look at the pattern and likely source of moisture before recommending work to the window. In some cases, sash-window repair, servicing or glazing improvements may form part of the solution. In others, ventilation or another aspect of the property may need to be considered alongside the joinery.