After a few years, your double glazed windows may need replacement. The most common problems with double glazing are misting or discolouration, and the build up of condensation between the two panes of glass. Condensation build-up is usually a result of faulty installation allowing moisture to enter the space and build up over time.
Sometimes the problem is a result of faulty seals which can relate to faulty manufacturing or again, incorrect installation. The good news is that a condensation problem does not always mean that the whole window and frame needs to be replaced.
Replacement double glazed units can be installed into an existing frame to correct any problems caused by faulty seals or installation. If you are considering doing the installation yourself, bear these points in mind to prevent the same problem arising again.
? The unit should not sit directly on the frame, but should be installed on glazing blocks to provide ventilation and allow water to escape.
? Both panes of glass must be supported equally by the blocks.
? Replacement double glazed units are supplied as sealed units – but it is worth checking the seals to ensure that you do not experience problems with condensation over time.
If the frame is part of the problem, for instance if the frame is damaged or warped and allowing moisture to enter the unit, you may need to replace the frame and the window. This may be a good time to refurbish all the windows in your home. Replacement double glazed units can be fitted with timber, aluminium or uPVC frames to suit the style of your home.
uPVC is a popular material because it requires little maintenance, is available in a variety of colours and finishes, and is the most affordable option of the three. It is not suitable for listed buildings or homes in conservation areas however.
Timber is still very popular, particularly for traditional homes. The wood used for timber frames is usually hardwood, cedar or pine. Timber can be custom made to a specific design, but this is usually a costly exercise. Timber does need periodic maintenance in order to maintain its appearance.
Aluminium is more popular in commercial buildings than residential homes because it is not as good as uPVC in terms of insulation. Condensation was a regular problem with aluminium window frames as well. It is, however, an extremely durable material, and is rust and rot resistant – a big advantage in coastal areas. It is more expensive than uPVC.
Other than the frames, the size of window you want replacement double glazed units for will affect the cost as well, particularly if your window is a non-standard size and needs to be specially made. A glazing expert will be able to advise you on the need for new frames, or whether a replacement double glazed unit will suffice.
