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Maintaining Timber Windows

A well-maintained window made of timber is a crucial part of the historic structure of a building. It reflects, in various levels, the materials and techniques of the time in which it was made, the architectural style and craftsmanship.

When repairs are feasible to windows that are already in use should be made in-situ. The repair system that is based on resin can be used to fix the most damaged areas of decay without removing the whole window.

Durability

Timber windows were built to last for hundreds of years. But, they have to be maintained to ensure they look good and functioning correctly. Maintenance tasks include sash cord repairs and retightening pulleys on sash, and painting. There is a growing need to upgrade the timber windows to increase energy efficiency. This could mean replacing old glass units, fixing existing window rebates, or installing new cills that allow for better air sealing.

One of the major issues with traditional windows is damage caused by corrosion of the paintwork. This is particularly important in the case of sash windows, as the gaps between sashes may be very large. In these circumstances water may get through the paint film and cause rotting of the putty and the wood underneath. The rotting may be further aggravated due to weather conditions that are poor. To stop this from happening, windows should be regularly painted with a suitable exterior wood paint.

Areas that have been damaged must be repaired using a resin-based product. This will ensure that the best possible amount of the original fabric is retained. It is important to minimize the number of holes that are drilled into the frame to allow cable entry since they can let in moisture and cause decay.

Another significant problem with older windows is structural movement in the wall, which could cause deformation of the frame and the sash. This could result in sash not fitting correctly, jamming or sticking 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 must be made of a durable hardwood, such as oak, to avoid the movement of new and older work.

There are several companies that produce Boston pattern wooden windows cambridge sash that fit into the majority of existing openings. The sash is available in various sizes and finishes that suit the needs of modern homeowners. In conjunction with quadruple draught strip and better thermal insulation these new sash options can make a substantial difference to the energy efficiency of a house.

Aesthetics

Many old timber windows have a great aesthetic value as they often demonstrate, in a way the materials and techniques and architectural style of the time in when they were built. They also may have significant historical value in their own right. This is especially true for windows that were unglazed in the early days of timber-framed structures, which were just a collection of openings within the frame that were subdivided horizontally into mullions and vertical wood or iron bars to keep out intruders.

It is essential to preserve the appearance of traditional timber window doctor near me joinery. As soon as you notice any signs of decay due to moisture penetration, it is important to stop it. It is best to do this by thorough painting, especially if there is damage or deterioration. It is recommended to use paints that are designed to be used as part of a system (primer as well as undercoat, finish and primer) and follow the manufacturer's guidelines regarding preparation and the number of coats needed at each stage.

Wet rot is a common problem for old timber windows and the best way to stop it becoming a problem is to take out any damaged or rotten sections as soon as possible to prevent the spread of the fungus responsible for it. The replacement of rotting wood must be done with care by using a slow-growing deal (pine) and, wherever possible it is the same species as that which is being removed to avoid differential movement between the new section and existing timbers.

In the late the 17th and early the medieval periods, glass became cheaper and more plentiful so that glazed openings in timber-framed buildings gradually became sophisticated with wooden tracery as well as moulded mullions and protruding cills. In recent years, glass was fixed to frames that were rebated using glazing sprigs, not lead cames. This method of glazing is not just less susceptible to leaks, but it can allow for much wider clearer, more transparent sheets of glass to be used in windows than would be possible without the need for leaded lights.

Energy efficiency

Traditional timber windows are energy efficient due to their thickness and multilayer construction as well as attention to particulars. They also feature large glass areas as well as deep projecting cills that minimise air infiltration. With secondary glazing and draughtproofing the windows can be improved to improve their energy efficiency. It is important to keep in mind that these measures should be taken into consideration when it comes to the overall integrity and look of the original windows.

So, retaining existing historic windows that are in need of repair rather than replacing them makes sense especially when their thermal enhancements can be made cost-effectively through simple repairs and upgrades. Historic windows often have a historical value that shows a variety of technical development and changes in architectural taste. The pressures to replace such windows are usually based on the assumption that the old windows will need replacement in the near future, however the majority of them are capable of providing service for 150, 200 and even 250 years if they are properly maintained.

It is important to recognise that the decay problems associated with traditional timber windows can be avoided by regular maintenance and swift repairs. It is also essential to identify damp problems and fix them quickly to avoid major damage. The early deterioration of paint could be a problem as it allows moisture to get into the wood, which can cause wet rot. It is not uncommon for this damage to go undetected until the paintwork starts to crack or turn wavy. However, it could cause structural damage and further decay.

A paint of good quality will block moisture penetration. It is also essential to keep the paintwork in good condition to avoid mould and condensation. The use of modern synthetic paints can be problematic since they are typically made to be water-resistant and this can cause the growth of mildew in the window frame.

The majority of windows from the past were constructed from sapwood-rich timber. These timbers deteriorate quickly if exposed to rain, however they can be protected by a thorough preservation process prior to use. It is also crucial to ensure that the type of wood used is suitable to the location and climate conditions, since these factors can affect the longevity of the joinery. Local window manufacturers make a variety of timber sash that can be tailored to fit specific historic openings. They can be made to the standard Boston pattern dimensions or to specific dimensions that are compatible with the historic architecture.

Maintenance

Regular inspections carefully redecorated, as well as prompt repairs can extend the life of wooden windows. The major cause of decay is moisture penetration through the deteriorated paint and putty. This can be prevented by thorough painting and the use of high-quality wood preservative.

It is essential that repairs to the old sash and casement windows are properly executed and completed without causing any disturbance. It is possible to repair several traditional designs of timber windows without having to remove the frame. This is a must whenever it is possible. Paint that is peeling or loose should be removed with care and sanded lightly to improve the "key" of the surface, allowing for an improved adhesion of the new coating. Be careful to avoid stripping paint layers that could have historical value, and where these are present it is recommended that a study of the paint be carried out.

When a section of wood is rotting the best option is to remove it and replace it with timber inserts that are shaped to match the existing profiles. The wood that is inserted should be treated with wood preservative, and the junction between the cill for timber and the masonry sub-cill should be sealed.

Replacement of traditional windows with PVC-u may be an appealing option, particularly when the installer provides a 'one stop shop' installation service that can handle both removal and replacement within a day. It is essential that the person installing replacement windows has a full knowledge of the construction and history of traditional timber frames. This will enable them to make appropriate suggestions for energy efficiency improvements and other technical upgrades that do not alter the historical character of a building. Upvc Window Renovation replacements should be registered with a Competent Persons Scheme such as FENSA. This will ensure that the replacements are deemed to be approved by the Building Regulations as a suitable alternative. A skilled carpenter can put in PVC-u windows that are suited to the original character of the building. This is particularly relevant when windows are situated within conservation areas or listed buildings.