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Maintaining Timber Windows

A well-maintained wooden window is an important component of a historical building. It illustrates in varying degrees the various materials and techniques, craftsmanship and architectural taste of the time period that it was built in.

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

Durability

The timber windows in many old buildings were made to last for a long time. They do require maintenance to ensure they look good. Maintenance tasks include upvc repairs near me to sash cables, retightening of pulleys on sash, and painting. The demand for upgrading timber windows in order to increase energy efficiency is also growing. This may mean replacing old glass units, repairing existing window rebates or putting in new cills to allow for improved air sealing.

A key problem with traditional windows is damage caused by corrosion of the paintwork. This is particularly true when windows made of sash are involved because the gaps between sashes can be extremely wide. In these circumstances water may get through the paint film and cause rotting of the putty and underlying wood. The rotting may be further aggravated due to weather conditions that are poor. To avoid this, windows should be painted regularly 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 the original fabric is preserved. It is also essential to limit the number of holes drilled into the frame for cable entry since these could admit water and lead to decay.

Another significant problem with older windows is the structural movement within the wall that can lead to deformation of the frame and the sash Window repair cambridge. This could result in sash no longer fitting correctly and jamming or sticking to the opening and cracked glazing. Often this can be corrected by fitting new sash boxes that have been made from slow grown deal (pine) or oak. The cill should be constructed of a durable hardwood like oak to avoid differential movement between the new and existing work.

There are now several companies that manufacture Boston pattern wooden sash to fit into the majority of existing openings. They are available in a variety of sizes and finishes to suit the needs of modern homeowners. Together with quadruple draught strips and a better thermal insulation, these new sash options can make a substantial difference to the energy efficiency of a home.

Aesthetics

A lot of old timber frames have a great aesthetic appeal because they display, in a certain shape, the materials, technology, and architectural aesthetics of the time they were made. They could also have a significant historic value in their individual cases. This is particularly true for early windows that were not glazed in timber-framed structures, where the majority were simply a series of openings within structural frames subdivided horizontally by mullions with vertical wood or iron bars in order to keep out intruders.

Traditional window joinery made from timber is a beautiful feature of a building and is crucial to keep it looking good. As soon as you notice any decay caused by the penetration of moisture, it is important to stop it. It is best to do this through thorough painting, especially where there has been damage or degradation. It is advisable to use paints that are designed to be used as part of the system (primer as well as undercoat, finish and primer) and to follow the manufacturer's recommendations in terms of preparation and the number of coats needed at each stage.

The fungus that causes wet rot is able to spread quickly in old timber windows. To prevent this, get rid of any damaged or rotten parts as quickly as you can. Replace the wood that is rotting with slow-growing deal (pine) and, when possible, the exact kind of timber that is being removed, to avoid any differential movement.

Glass became less expensive and more abundant during the late medieval period and into the 17th century. As a result, the glazed openings in timber-framed homes became more complicated with moulded mullions, tracery made of wood and cills that protruded deep. In recent years, double glazing seal repairs was pinned into frames that were rebated with glazing sprigs rather than lead cames. This method of glazing is not only less susceptible to leaks, but it can allow for more expansive, clearer sheets of glass to be used in the windows than would be possible without the need for leaded lights.

Energy efficiency

The traditional timber windows are energy efficient because of their thickness and multilayer construction as well as attention to the smallest of details. The large glass surfaces, the deep projection cills and wide glazing areas reduce air infiltration. The windows can be made to increase their energy efficiency with draught-proofing and secondary glazing. However it is crucial to keep in mind that any such measures should be viewed in the context of the overall appearance and integrity of the original window.

It is sensible to fix or upgrade historic windows rather than replace them, especially when the improvements in thermal efficiency can be achieved through simple repairs. Older windows typically have an historic value that demonstrates a range of technological advances and changes in architectural tastes. Many people believe that these windows will have to be replaced in the near future. However, they can still provide service for 150,200, and even 250 years with proper maintenance.

It is important to recognise that the decay issues caused by traditional timber windows can be avoided by thorough maintenance and swift repairs. It is also crucial to recognize damp issues and correct them swiftly to avoid major damage. The early deterioration of paint is a major issue, since it allows moisture penetrate the wood and cause wet rot. It is not uncommon for this damage to go unnoticed until the paintwork starts to crack or turn curly. However, it can cause structural damage and lead to further decay.

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

The majority of older windows were constructed of sapwood-rich timber. These timbers deteriorate quickly if exposed to rain, but they can be protected by an extensive preservation treatment prior to use. It is also crucial to ensure that the type of wood used is suited to the location and climate conditions, since these factors will influence the durability of the joinery. Local window manufacturers produce a range of sash made of timber that can be customized to fit specific openings from the past. They can be made according to the standard Boston pattern dimensions or to specific sizes that are in keeping with the historic architecture.

Maintenance

Regular inspection, careful redecoration, and timely repairs can prolong the life of timber windows. The primary cause of wood decay is the penetration of moisture through the deteriorated paint and putty. This can be prevented by thorough painting and the use of high-quality wood preservative.

Repairs to sash windows that are old and frameless casement windows should be handled with care and with minimal disruption. It is possible to fix the majority of traditional wooden window designs without having to remove the frame. This should be done whenever possible. Loose or peeling paint should be removed with care and sanded lightly to improve the key of the surface, allowing for an improved adhesion of the new coating. It is important to avoid stripping paint layers that could have historical value and if they are present it is recommended that a paint analysis be conducted.

If a piece of wood has rotted, the best solution is to remove it and replace it with timber inserts designed to match the existing profiles. The timber inserts should be treated with a wood preservative, and the joint between masonry sub-cill and timber cill should be sealed.

Replacement of traditional windows using PVC-u is an appealing option, particularly when the installer offers a 'one stop shop' installation service that can handle removal and replacement in one day. It is important that the installers of replacement windows have a thorough understanding of the history and construction of traditional timber frames. This will allow them to make appropriate recommendations for energy efficiency improvements as well as other technological improvements that don't affect the appearance of an historic building. Anyone who installs replacement windows must be registered under a Competent Persons Scheme such as FENSA. This will ensure that replacement windows are approved in accordance with Building Regulations as a suitable option. It is certainly possible for an experienced and skilled carpenter to install PVC-u windows that match the the original building. This is especially true when windows are installed in listed buildings and conservation areas.