Maintaining Timber Windows
A well-maintained wooden window is an important component of a historical building. It is a representation of the different materials and technologies as well as the craftsmanship and architectural style of the time that it was built in.
If it is possible, repairs must be done in-situ. Repairing the worst areas of decay can be accomplished with the help of specialized resin-based systems.
Durability
The timber windows in many old structures were designed to last for centuries. They require regular maintenance to keep them looking good. Maintenance tasks include repairs to sash cords, retightening of pulleys for sash and painting. The need to upgrade timber windows in order to improve energy efficiency is also growing. This can involve replacing old glass units, repairing existing window rebates or putting in new cills to allow the air to seal better.
The deterioration of paintwork is a major problem with traditional windows. This is especially important where windows made of sash are involved because the gaps between the sashes can be very wide. In these instances water can get into paint film and cause rotting to the wood or putty beneath. The rotting may be further aggravated by poor weather conditions. To stop this from happening, windows should be painted regularly with an exterior wood paint.
Areas that have been damaged must be repaired with a resin-based product. This will ensure that the best possible amount of the original fabric is preserved. It is also important to reduce the number of holes you drill into the frame to allow cable entry as these can let in water and cause decay.
Another significant problem with older windows is the structural movement within the wall which can lead to deformation of the frame and the sash. This could result in sash no longer fitting correctly, sticking or jamming in the opening and cracked glazing. This is often corrected by fitting new frames for sash made of slow-grown deal (pine) or oak. The cill needs to be constructed from a sturdy hardwood, such as oak, to avoid shifting between the new and existing work.
To reduce the risk There are a number of companies who manufacture Boston pattern sash made of wood that can be fitted into most openings. These sash are available in a range of sizes and finishes to suit the requirements of the modern homeowner. These new sash, when combined with quadruple draft strip and improved thermal insulation can make a significant difference to the efficiency of your home's energy usage.
Aesthetics
A lot of old timber frames have a great aesthetic appeal because they show, in some form, the quality of the wood technology, design, and aesthetics of the time they were built. They may also have significant historical value in their in their own right. This is particularly true of early unglazed windows in timber-framed buildings, 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.
It is important to maintain the appearance of traditional timber window joinery. As soon as you see any signs of decay caused by moisture penetration it is crucial to stop it. It is recommended to do this through thorough painting, especially if there has been damage or deterioration. It is recommended to use paints that are specifically designed to be used part of the system (primer, undercoat and finish) and to follow the manufacturer's recommendations in relation to preparation and number of coats needed at each stage.
The fungus responsible for wet rot can quickly spread in old timber windows. To prevent this from happening, get rid of any damaged or rotten parts as promptly as you are able to. The replacement of rotting timber should be done with care and using slow grown deal (pine) and, whenever possible it is the same species as that which is being removed in order to prevent shifting between the new section and the existing timbers.
In the late the 17th and early the medieval periods, glass became less expensive and more abundant, and the openings for glazed glass in timber-framed buildings gradually became more sophisticated with wooden tracery, moulded mullions and deep projecting cills. The glazing was increasingly set within rebated frames and secured with 'glazing sprigs', rather than being inserted into lead cames. This method of glazing is not only less prone to leaks but it can allow for larger and clearer sheets of glass to be used in windows than would otherwise be 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. They also pay attentive attention to detail. The large glass areas, the deep projecting cills, and the large glazing areas help to reduce air infiltration. The windows can be modified to improve their energy efficiency through draughtproofing and secondary glazing. It is essential to remember that these measures should be considered in relation to the overall integrity and look of the original windows.
So, retaining old windows that require repair instead of replacing them makes sense, particularly when their thermal enhancements can be achieved inexpensively with simple repairs and upgrades. Older windows typically have historical significance that illustrates a variety of technological advancement and changes in architectural taste. Most people think 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 problems in traditional timber windows are preventable by quick and thorough repairs. In addition it is crucial to recognize damp penetration issues and fix them promptly to avoid major damage. Early deterioration of paint is a major issue, because it allows moisture to penetrate the wood and cause wet rot. This damage is often not noticed until the paintwork becomes damaged or wavy however, it can cause serious structural damage, and could lead to further decay.
A paint of good quality will block moisture penetration. To avoid condensation and mould it is crucial to keep the paintwork as clean as you can. Modern synthetic paints pose a problem because they are water-resistant and may cause mildew to grow in the window frame.
The majority of older windows were constructed of sapwood-rich timber. These timbers can deteriorate very rapidly if exposed to wet weather, but can be preserved with an extensive preservative treatment prior to when they are put to use. It is also crucial to ensure that the kind of wood used is suitable to the location and climate conditions, as these elements will influence the durability of the joinery. Local window manufacturers offer various types of sash timbers that can be customized to fit historic openings. They can be made to the standard Boston pattern dimensions or to custom sizes that are in keeping with the architectural style of historic buildings.
double glazing repair in cambridge , careful redecoration, and prompt repairs can extend the lifespan of windows made of timber. The main cause of decay is the penetration of moisture through deteriorated paint or putty. This can be avoided with thorough painting and the use of high-quality wood preservative.
It is essential that repairs to old sash or casement windows are properly executed and done without causing any disturbance. Many traditional timber window designs are repairable without removing the frame, and this approach should be followed whenever feasible. Loose or peeling paint must be removed with care and sanded lightly to improve the 'key' of the surface and facilitate an improved adhesion of the new coating. It is important to avoid stripping paint layers that might have historical significance If these are present it is recommended that a study of the paint be carried out.
If a portion of wood is decayed the best option is to remove it and replace it with timber inserts designed to match existing profiles. The inserted timber should also be treated using wood preservative, and the joint between masonry sub-cill and timber cill should be sealed.
Replacement of traditional windows with PVC-u can be an appealing option, particularly when the installer provides a 'one stop shop' installation service that can handle removal and replacement within a day. However, it is vital that the installer of replacement windows has a complete knowledge of the structure and history of traditional wooden frames. This will enable them to make the right recommendations for energy-efficiency improvements and other technological upgrades that won't harm the character of a historic building. Anyone who installs replacement windows must be registered under a Competent Persons Scheme such as FENSA. This will ensure that the replacements are deemed as a suitable solution in accordance with Building Regulations. A skilled carpenter can install PVC-u Windows that are sympathetic to the original character of the building. This is especially true where windows are situated in listed buildings or conservation areas.