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Maintaining Timber Windows

A well-maintained wooden window is an essential component of a historical building. It illustrates in varying degrees the materials and technologies as well as the craftsmanship and architectural style of the period that it was built in.

If it is possible, repairs must be done in-situ. The repair system that is based on resin can be used to repair the most damaged areas of decay without having to remove the entire window.

Durability

The timber windows in many historic buildings were made to last for a long time. They require regular maintenance to ensure they look good. Maintenance tasks include sash cord repairs, retightening of pulleys on sash, and painting. There is a growing need for upgrading timber windows to increase the efficiency of energy. This could mean replacing old glass units, repairing existing window rebates or putting in new cills the air to door seal repair near me better.

One of the major issues with traditional windows is the damage caused by corrosion of the paintwork. This is especially important where sash windows are involved as the gaps between the sashes can be quite large. In these cases water can enter the paint film and cause rotting of the wood or putty underneath. The weather can be a factor in accelerating the rotting. To prevent this windows from becoming rotten, they must be painted regularly using an exterior wood paint that is suitable.

The areas that are damaged should be repaired with a resin-based product. This will ensure the maximum amount of original fabric is retained. It is essential to limit the number of holes made in the frame to allow cable entry, as these can admit moisture and cause decay.

The structural movement of the wall could also cause deformations in the frame and sash. This can result in sash not fitting correctly and jamming or sticking into the opening, and even broken glass. Often this can be corrected by fitting new sash boxes that have been constructed from slow-growing deal (pine) or oak. The cill should be constructed of a strong hardwood like oak, to prevent differential movement between new and older work.

To alleviate this issue to reduce the risk of this happening, there are a number of companies who produce Boston pattern wooden sash that will fit into the majority of existing openings. The sash is available in various sizes and finishes that will suit the needs of modern homeowners. Together with quadruple draught strips and better thermal insulation these sashes can make a significant improvements to the energy efficiency of a home.

Aesthetics

Many old timber windows have a great aesthetic value since they usually show, in a particular way, the materials and technology and architectural taste of the time in which they originate. They may also have significant historical significance in their own right. This is especially true of early windows that were not glazed in timber framed buildings which were merely a series of openings within the structural frame sub-divided horizontally into mullions and wood or iron bars to keep out intruders.

It is important to maintain the appearance of traditional timber window joinery. As soon as you notice any signs of decay caused by water penetration, it is important to stop it. This is best accomplished by a thorough painting process, especially in areas that have already suffered damage or degradation. It is best to use paints that are designed to be used in a set (primer undercoat and finish) and to adhere to the manufacturer's recommendations for preparation and number of coats at each stage.

The fungus that causes wet rot can spread quickly in old windows made of timber. To stop this from happening, take out any damaged or rotten components as promptly as you are able to. Replace rotting wood with slow-growing deal (pine), and should it be possible, the same kind of timber as the one that is being removed to prevent any differential movement.

In the late medieval and 17th century periods glass became more affordable and plentiful so that glazed openings in timber-framed buildings gradually became more sophisticated, with tracery made of wood as well as moulded mullions and projecting cills. Increasingly, the glazing was placed within frames with rebates and pinned in with 'glazing sprigs' rather than into lead cames. This method of glazing is not just less prone to leaks but it also allows more expansive, clearer sheets of glass to be used in windows than would otherwise have been possible without the need for lead lights.

Energy efficiency

Traditional timber windows have a good energy performance due to their thickness and multi-layer construction, as well as attentive attention to detail. The large glass areas, the deep projection cills and wide glazing areas reduce air infiltration. The windows can be made to increase their energy efficiency by draught-proofing and secondary double glazing Seal repairs. It is important to remember that these measures must be taken into consideration when it comes to the overall integrity and look of the original windows.

As a result, retaining the existing windows from the past that require repair instead of replacing them makes sense especially when their thermal improvements can be achieved cost-effectively through simple repairs and improvements. Older windows are usually of historical significance, since they reflect a variety of technological advancement and changes in the architectural style. The pressure to replace these windows are generally based on the assumption that windows of the past will require replacement in the near future, but they are capable of serving for 150, 200 and even 250 years if they are properly maintained.

It is crucial to recognize that the decay issues that are that are typical of timber windows can be avoided by thorough maintenance and timely repairs. It is also crucial to spot damp issues and correct them swiftly so that you can avoid serious damage. Early deterioration of paint is a major issue, because it allows moisture to 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 wavier. However, it could cause structural damage and lead to further decay.

A good quality paint will stop this moisture penetration. To prevent mould and condensation it is essential to keep the paintwork as clean as it can be. Modern synthetic paints can pose a problem, as they are often 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 a high proportion of sapwood. These timbers can deteriorate very quickly when exposed to moist weather, but can be protected by a thorough treatment of preservative before they are used. It is important to choose the right kind of wood for the location and the climate, since these factors can affect the durability of the joinery. Local window manufacturers offer an array of sash timbers that can be made to fit the historic openings. They can be made to the standard Boston pattern dimensions or to specific dimensions that are compatible with historic buildings.

Maintenance

The life span of windows made from timber can be extended significantly by regular inspection carefully redecoration, and prompt repair. The main cause of decay is moisture penetration through deteriorated paint or putty. This can be avoided with careful painting and the use of high-quality wood preservative.

It is crucial that repairs to old sash and casement windows are well executed and completed with minimal disruption. Many traditional timber window designs are repairable without removing the frame, and this approach should be used whenever it is possible. Loose or peeling paint should be removed with care and sanded lightly to increase the 'key' of the surface and facilitate a better adhesion of the new coating. It is essential to not remove old paint layers, as they may have historical value.

Where a section of timber has become rotten the best course of action is to remove the rotted material and replace it with spliced-in inserts that are shaped to fit the existing profiles. The timber that is inserted should be treated using wood preservative. The junction between masonry sub-cills and timber cill should be sealed.

Replacement of traditional windows with PVC-u may be an attractive option, especially when the installer offers a "one-stop shop" installation that takes care of both removal and replacement within one day. However, it is essential that the person installing replacement windows has a full knowledge of the structure and history of traditional timber frames. This will allow them to make the right recommendations for energy efficiency improvements and other technological upgrades that do not alter the historical character of a building. The window installers who provide replacement windows must be registered with a Competent Persons Scheme such as FENSA. This will ensure that the replacement windows are approved as a suitable solution under Building Regulations. A skilled carpenter can install PVC-u windows that are suited to the original character of the building. This is especially true where windows are situated in listed buildings and conservation areas.