Professional draught proofing can make a significant difference to a traditional sash and case window when unwanted air leakage is coming through the gaps around moving sashes. It is not the same as sealing a window shut: the window should continue to open, close and ventilate as designed.
Where do sash-window draughts come from?
Air commonly enters around the meeting rails, staff beads, parting beads and the edges of the sashes. Wear, paint removal and small distortions can enlarge these gaps over time. Failed cords or poorly balanced sashes can also stop the window closing correctly.
What does a professional system involve?
The sashes are normally removed so suitable brush seals can be incorporated discreetly into new or modified beads and meeting details. At the same time the cords, pulleys, weights and general operation can be checked. See our sash window draught-proofing service.
What improvements should you expect?
Draught proofing primarily reduces uncontrolled air movement. This can improve perceived comfort, reduce rattling and make rooms feel less cold. It does not turn single glass into double glazing, so heat transfer through the pane remains.
Should you add secondary or double glazing?
That depends on the building, budget, conservation requirements and the level of thermal or acoustic improvement sought. Our comparison guide explains how the three approaches differ.
Don’t forget ventilation
Reducing uncontrolled leakage means planned ventilation becomes more important. Kitchens, bathrooms and occupied rooms still need appropriate ventilation to manage moisture and indoor air quality.
If your windows rattle, whistle or feel excessively draughty, request a survey and quotation.