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Maintaining Timber Windows

A well-maintained and maintained timber window is an important part of the historic structure of a building. It reflects, in various degree the materials and techniques of the time in which it was constructed, as well as the design and craftsmanship.

If possible, repairs should be made in-situ. Proprietary resin-based repair systems can be used to repair the worst areas of decay without having to remove the entire window.

Durability

Timber windows were built to last for hundreds of years. They do require some maintenance to ensure they look good. The most frequently-asked maintenance tasks are repairs to sash-cords and re-tightening the sash pulleys and painting. There is also a rising demand to upgrade timber windows to increase energy efficiency. This could include replacing old glazing units, fixing the window rebates that are in place or double glazed Windows Cambridge (read on) installing new cills for improved air seal.

The corrosion of paintwork is a major issue with traditional windows. This is particularly true when windows with sash are involved since the gaps between sashes can be extremely wide. In these instances water can enter the paint film and cause rotting of the putty or wood beneath. Poor weather conditions can exacerbate the decay. To prevent this, windows should be regularly painted with a suitable exterior wood paint.

In addition to repainting, corroded areas need to be repaired with an adhesive-based repair product. This will ensure the maximum amount of original fabric preserved. It is also necessary to minimise the number of holes that are drilled into the frame for cable entry, as they could let in water 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 sash not fitting correctly, jamming or sticking in the opening, and even broken window cambridge glass. This can often be fixed by the fitting of new windows cambridge sash boxes that have been constructed from slow-growing deal (pine) or oak. The cill should be constructed from a sturdy hardwood such as oak to prevent movement between the existing and new work.

To alleviate this issue, there are now a variety of companies that manufacture Boston pattern sash made of wood that will fit into the majority of existing openings. The sash is available in a range of sizes and finishes to suit the requirements of the modern homeowner. These new sash, when combined with quadruple draft strips and a more efficient thermal insulation, could make a huge difference to the energy-efficiency of a home.

Aesthetics

A lot of old timber frames have a high aesthetic appeal because they reflect, in some form, the quality of the wood technology, design, and aesthetics of the time they were made. They also may have a significant historic value in their own right. This is particularly true of windows that were unglazed in the early days of timber framed buildings where the great majority were merely a series of openings in the frame, upvc patio doors cambridge cambridge windows and doors (Recommended Internet site) which were divided horizontally into mullions and wood or iron bars to deter intruders.

It is crucial to maintain the appearance of traditional timber window joinery. It is essential that any decay that results from water penetration is stopped as soon as it is discovered. This is best accomplished by applying a thorough coat of paint, particularly in areas that have already suffered damage or deterioration. It is advisable to use paints specifically designed to be used as part of the system (primer as well as undercoat, finish and primer) and follow the manufacturer's instructions in relation to preparation and number of coats needed at each stage.

Wet rot is a typical issue in old timber windows. The best way to stop it becoming a problem is to take out any damaged or rotten sections immediately to stop the spread of the fungus responsible for it. The replacement of rotting wood should be carefully undertaken with a slow-growing deal (pine) and, whenever possible using the same species as which is being removed to prevent differential movement between the new and old timbers.

Glass became cheaper and more abundant in the late medieval period and into the 17th century. In the process, the openings for glazed windows on timber-framed houses became more complex with moulded mullions, tracery made of wood and deep projecting cills. In recent years, glass was pinned into frames that were rebated using glazing sprigs instead of lead cames. This method of glazing is not only less susceptible to leaks, but it can allow for more expansive and 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 an excellent energy performance due to their thickness and multi-layer construction. They also pay meticulous attention to detail. The large glass areas, the deep projecting cills and large glazing areas reduce air infiltration. With secondary glazing and draught proofing, windows can be upgraded to increase their energy efficiency. However it is essential to remember that such measures should be viewed in the context of the overall quality and appearance of the window in its original form.

As a result, retaining existing historic windows that require repair instead of replacing them is logical particularly when thermal enhancements can be achieved inexpensively with simple repairs and improvements. The windows that are historic have a lot of historical value, as they demonstrate a variety in technological advancements and changes to architectural style. The pressures to replace such windows are generally based on the assumption that the windows of the past will require replacement in the near future, however they are capable of serving for 150, 200 and even 250 years if properly maintained.

It is crucial to understand that decay issues associated with traditional timber windows are easily prevented with timely and thorough repairs. It is also essential to recognize damp issues and address them promptly in order to avoid major damage. The early deterioration of paint is a particular problem, because it allows moisture to penetrate the wood and [empty] cause wet rot. It is not uncommon for this type of damage to go unnoticed until the paintwork begins to crack or become wavy. However, it can cause structural damage and further decay.

A good quality paint will prevent this moisture penetration. To prevent condensation and mould it is essential to keep the paintwork as clean as possible. Modern synthetic paints pose a problem since they are usually water-resistant and can cause mildew growth in the window frame.

Most older windows were made from sapwood-rich wood. These timbers can deteriorate quickly when exposed to rain, however they can be preserved with an extensive preservation treatment prior to use. It is also essential to ensure that the kind of wood used is suited to the location and climate conditions, since these factors can affect the longevity of the joinery. Local window manufacturers have various types of sash timbers that can be made to fit the historic openings. They can be built according to the standard Boston pattern dimensions, or to custom sizes that fit with the historic architecture.

Maintenance

Regular inspections as well as careful redecoration and prompt repairs can extend the life of wooden windows. The primary cause of wood decay is moisture leaking through deteriorated paint and putty. This can be avoided by careful painting and using a good quality wood preservative.

Repairs to old sash windows as well as casement window frames must be done with care and minimal disruption. Repairs can be made to several traditional designs of timber windows without having to remove the frame. This should be done whenever possible. Remove 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. It is essential to not remove old paint layers, which could have historical significance.

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

Replacement of windows made of traditional PVC-u can be an appealing option, particularly when the installer offers a 'one stop shop' installation that handles removal and replacement in a day. However, it is essential that the person installing replacement windows has a complete knowledge of the structure and history of traditional timber frames. This will enable them to make the right recommendations for energy efficiency improvements as well as other technological upgrades that won't affect the appearance of an historic building. Those providing replacement windows should be registered with a Competent Persons Scheme such as FENSA. This will ensure the replacements are deemed to be approved in accordance with Building Regulations as a suitable option. A skilled carpenter can put in PVC-u windows that conform to the original building's style. This is particularly true where windows are situated in listed buildings and conservation areas.