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Maintaining Timber Windows

A well-maintained window made of timber is a significant element of the historic fabric of a structure. It reflects, in various levels, the materials and technologies of the time it was constructed, as well as the craftsmanship and architectural taste.

When possible, repairs should be done in-situ. Repairing the worst areas of decay can be accomplished with the help of specialized resin-based systems.

Durability

Timber windows were designed to last for centuries. They require regular maintenance to keep them looking great. The most frequent maintenance tasks include repairs to sash cords and re-tightening the sash pulleys and painting. There is a growing need to upgrade timber windows to improve energy efficiency. This can include replacing old glazing units, repairing existing upvc window lock repair rebates or installing new cills to improve air seal.

A key problem with traditional windows is the damage caused by the corrosion of the paintwork. This is especially important where windows made of sash are involved because the gaps between the sashes can be very large. In these situations, water can penetrate the paint film and cause rotting of the putty and the wood beneath. The rotting process can be made worse due to weather conditions that are poor. To stop this from happening, windows should be regularly painted with an exterior wood paint that is suitable.

In addition to repainting, areas that have corroded should be repaired with a resin-based repair product. This will ensure that the maximum amount of original fabric is preserved. It is also necessary to limit the number of holes that are drilled into the frame to allow cable entry, as they could allow water in and cause decay.

Another issue with older windows is the structural movement within the wall that can lead to deformation of the frame and sash. This could result in the sash fitting incorrectly jamming, sticking or sagging in the opening, and even broken glass. Often this can be corrected by the fitting of new sash boxes that have been made from slow grown deal (pine) or oak. The cill should be constructed from durable hardwood such as oak to prevent movement between the new and existing work.

There are now several companies that manufacture Boston pattern wooden sash that fit most existing openings. The sash is available in a range of sizes and finishes to suit the requirements of the modern homeowner. Together with quadruple draught strips and better thermal insulation these new sash options can make significant improvements to the energy efficiency of a house.

Aesthetics

Many old timber windows have a high aesthetic value because they typically demonstrate, in a way the materials and technologies and architectural taste of the time from which they date. They could also have a significant historical significance in their individual cases. This is particularly true of early windows that were not glazed in timber framed buildings which were merely a series of openings within the frame, which were divided horizontally into mullions and iron or wood bars to keep out invaders.

It is crucial to maintain the appearance of traditional wooden window joinery. As soon as you see any decay caused by water penetration it is crucial to stop it. This is best accomplished by painting thoroughly, especially in areas in which there is already damage or deterioration. It is advisable to use paints specifically designed to be used as part of a system (primer as well as undercoat, finish and primer) and to follow the manufacturer's recommendations in relation to preparation and the number of coats needed at each stage.

Wet rot is a frequent problem in old timber windows. The best way to stop it growing is to eliminate any damaged or rotten sections as soon as possible to prevent the spread of the fungus responsible for it. Replace rotting wood with slow-grown deal (pine) and, should it be possible, the same kind of timber as the one being removed, to avoid the possibility of differential movement.

In the late the 17th and early the medieval periods, glass became more affordable and plentiful so that glazed openings in timber-framed structures gradually became more sophisticated with wooden tracery, moulded mullions and deep protruding cills. In recent times, glass was fixed into frames that were rebated using glazing sprigs, not lead cames. This method of cambridge double Glazing is not just less prone to leaking but it can allow for much wider, clearer sheets of glass to be used in windows than would otherwise be possible without the need for leaded lights.

Energy efficiency

Traditional timber windows are energy efficient because of their thickness, multilayer construction and attention to particulars. They also feature large glass areas and projecting cills that reduce air infiltration. The windows can be modified to improve their energy efficiency through draughtproofing and secondary glazing. However it is essential to remember that such measures should be evaluated in terms of the overall integrity and appearance of the original window.

So, retaining old windows that are in need of repair instead of replacing them is logical particularly when thermal enhancements can be made cost-effectively through simple repairs and upgrades. The windows of the past often have historical significance that illustrates a variety of technological advances and changes in architectural taste. The pressures to replace such windows are typically based on the assumption that the windows of the past will require replacement in the near future, however the majority of them are in a position to last for 150, 200 or even 250 years, if properly maintained.

It is important to recognise that the decay issues that are associated with traditional timber cambridge windows and doors can be avoided by thorough maintenance and prompt repairs. It is also essential to identify damp problems and correct them swiftly so that you can avoid serious damage. Early deterioration of paint is a particular problem, since it allows moisture penetrate the wood and cause wet rot. The damage is usually not evident until the paintwork is cracking or wavy however, it can cause serious structural damage, and could lead to further decay.

A paint of good quality will prevent moisture penetration. To prevent condensation and mould, it is important to keep the paintwork as clean as you can. Modern synthetic paints pose a problem because they are often water-resistant, and can cause mildew to develop within the window frame.

The majority of older windows were constructed from sapwood-rich wood. The timbers will deteriorate rapidly if exposed to rain, however they can be preserved with a thorough preservation process prior to use. It is also crucial to ensure that the kind of timber used is well-suited to the site and climate conditions, as these elements affect the durability of the joinery. Local window manufacturers make a range of sash made of timber that can be adapted to fit specific openings from the past. They can be made according to the standard Boston pattern dimensions or to custom dimensions that are compatible with historic buildings.

Maintenance

Regular inspection, careful redecoration, and prompt repairs can extend the life of timber windows. The primary reason for the decay is the infiltration of moisture through deteriorated paint and putty. This can be prevented by using a high-quality wood preservative and thoroughly painting the wood.

Repairs to old sash windows as well as casement window frames should be done with care and with minimal disruption. It is possible to repair the majority of traditional wooden window designs without having to remove the frame. This should be done whenever possible. Remove any peeling or loose paint and lightly sand the surface to improve the "key" of the surface. This will enable the new coating to stick better. Be careful to avoid stripping old paint layers that could have historical value If these are present it is recommended that a study of the paint be conducted.

If a piece of wood is decayed, the best solution is to take it off and replace it with timber inserts designed to match the existing profiles. The wood that is being inserted should be treated with a wood preserver and the joint between the cill for timber and the sub-cill for masonry should be sealed.

It's tempting to replace traditional windows with PVC U, particularly if the installer offers an all-in-one installation that includes both replacement and removal in one day. It is important that the installers of replacement windows have a thorough understanding of the history and design of traditional timber frames. This will allow them to make the appropriate suggestions for energy efficiency improvements and other technological improvements that don't harm the character of a historic building. The window seal repairs near me installers who provide replacement windows must be registered with a Competent Persons Scheme like FENSA. This will ensure that the replacements are deemed acceptable by the Building Regulations as a suitable alternative. A skilled carpenter can put in PVC-u windows that are suited to the original building's style. This is especially true when the windows are located in listed buildings and conservation areas.