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Maintaining Timber Windows

A well-maintained wooden window is a crucial element of a building that is historic. It illustrates in varying degrees the materials and technologies, craftsmanship and architectural taste of the time from which it dates.

When repairs are feasible to existing windows should be made in situ. Repair systems made of resin can be used to fix the worst areas of decay without removing the entire window.

Durability

The timber windows in many historic buildings were built to last for centuries. They require regular maintenance to ensure they look good. Maintenance tasks include repairs to sash cables as well as tightening the pulleys on sash, and painting. The demand for upgrading timber windows in order to improve efficiency in energy use is also growing. This may mean replacing old glazing units, repairing the window rebates that are in place or putting up new cills to allow the air to seal better.

The deterioration of paintwork is a major issue with traditional windows. This is particularly important when windows made of sash are involved because the gaps between the sashes can be very large. In these situations water may get through the paint film and cause rotting of the putty and underlying wood. The rotting may be further aggravated by weather conditions that are not ideal. To prevent this from happening, windows must be painted regularly with an exterior wood paint.

Corroded areas should be repaired with resin-based products. This will ensure the maximum amount of the original fabric is preserved. It is also necessary to limit the number of holes drilled into the frame for cable entry, as they could let in water and cause decay.

The structural movement of the wall can cause distortions in the frame as well as the sash. This can lead to sash no longer fitting correctly or sticking or jamming into the opening and broken glazing. This can be fixed frequently by fitting new sash frames made of slow-growing deal (pine) or oak. The cill should be made from durable hardwood such as oak to avoid any movement between the new and existing work.

There are now several companies that make Boston pattern wooden sash that fit in with the majority of openings. The sash is available in a variety of sizes and finishes that meet the requirements of the modern homeowner. These sash are combined with quadruple draft strips and improved thermal insulation can make a significant difference to the efficiency of a home's energy use.

Aesthetics

Many old timber frames have a high aesthetic appeal, since they reflect, in some form, the quality of the wood, technology, and architectural style of the time they were made. They may also have significant historical value in their individual cases. This is particularly true of early windows that were not glazed in timber-framed structures, which were merely a series of openings in the frame, which were divided horizontally into mullions and wood or iron bars to deter invaders.

Traditional window joinery made from timber can be a stunning element of a structure and is crucial to keep its appearance. It is vital that any decay caused by moisture penetration should be stopped as soon as it is identified. It is recommended to do this with thorough painting, especially if there has been damage or deterioration. It is best to choose paints that are intended to be used in a set (primer undercoat and finish), and to adhere to the manufacturer's recommendations for preparation and number coats at each stage.

The fungus that causes wet rot can spread quickly in old windows made of timber. To stop this from happening, get rid of any damaged or rotten parts as promptly as you are able to. The replacement of rotting timber must be done with care using slow grown deal (pine) and, whenever feasible it is the same species as which is being removed in order to prevent any movement differences between the new and old timbers.

Glass became less expensive and more abundant during the late medieval period and into the 17th century. In the process, glazed openings on timber-framed houses were more elaborate, with moulded mullions, wooden tracery and deep cills projecting into the air. In recent years, glass was fixed into rebated frames with glazing sprigs rather than lead cames. This method of double glazing seal repairs (Ongoing) is not only less prone to leaking but also allows for larger clearer, more transparent sheets of glass to be used in windows than would otherwise have been possible without the need for leaded lights.

Energy efficiency

Traditional timber windows provide a good energy performance due to their thickness and multi-layer construction. They also pay attentive attention to detail. They also feature large glass areas and projecting cills that reduce air infiltration. With secondary glazing and draughtproofing windows can be made more efficient to improve their energy efficiency. It is essential to keep in mind that these measures should be taken into consideration when it comes to the overall appearance and integrity of the original windows.

Therefore, keeping old windows that require repair instead of replacing them is sensible, particularly when their thermal improvements can be achieved cost-effectively through simple repairs and improvements. Older windows typically have an historic value that demonstrates a range of technological advancement and changes in architectural taste. Many people believe that these windows will need to be replaced in the near future. However, they are still in service for 150, 200 or even 250 years with proper maintenance.

It is crucial to understand that decay issues associated with traditional timber windows can be avoidable with timely and thorough repairs. In addition, it is essential to identify damp penetration problems and fix them promptly to avoid major damage. Early paint deterioration is a major problem since it allows moisture penetrate the wood and cause wet rot. The damage is usually not noticed until the paintwork becomes cracking or wavy, but can cause significant structural damage and can lead to further decay.

A high-quality paint will prevent this moisture penetration. To prevent mould and condensation, it is important to keep the paintwork as clean as it can be. The use of modern synthetic paints could be a problem because they are usually designed to be water-resistant and this can cause the growth of mildew in the window frame.

The majority of older windows were constructed from timber with the majority of sapwood. The timbers will deteriorate rapidly if exposed to rain, however they can be protected by a thorough preservation treatment before use. It is important to choose the right type of wood for the site and climate, as these variables can affect the longevity of the joinery. Local window manufacturers offer a wide range of timber sash which can be adapted to fit historical openings. They can be made to the standard Boston pattern dimensions or to specific dimensions that are compatible with the historic architecture.

Maintenance

The life span of windows made from timber can be extended considerably through regular inspections carefully redecoration, and prompt repair. The main reason for decay is moisture intrusion through deteriorated paint and putty. This can be avoided by using a quality wood preservative and painting the wood thoroughly.

It is important that repairs to old sash or casement windows are done correctly and done without causing any disturbance. Many traditional timber window designs can be repaired without dismantling the frame, and this option should be taken whenever possible. Peeling or loose paint should be removed carefully and sanded lightly to increase the key of the surface and facilitate a better adhesion of the new coating. It is important to avoid removing old paint layers, as they may have historical value.

If a piece of wood is rotting the best option is to take it off and replace it with timber inserts designed to match existing profiles. The inserted wood should also be treated with wood preservative, and the junction between the cill for timber and the sub-cill of the masonry should be sealed.

Replacement of traditional windows with PVC-u is a tempting option, especially when the installer offers a 'one stop shop' installation service that can upvc door handle repairs near me removal and replacement within a day. It is vital that the installer of windows replacement has a thorough knowledge of the structure and history of traditional wooden frames. This will allow them to make the right recommendations for energy efficiency improvements as well as other technological improvements that don't affect the appearance of a historic building. Those providing replacement windows should be registered with a Competent Persons Scheme like FENSA. This will ensure the replacements are deemed acceptable in accordance with Building Regulations as a suitable option. It is certainly possible for a skilled and experienced carpenter to install PVC-U windows that match the character of the original building. This is particularly applicable when windows are located within listed buildings or conservation areas.