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Maintaining Timber WindowsA well-maintained wooden window is an important component of a historical building. double glazing cambridge reflects in varying degree the technology and materials of the time it was constructed, as well as the craftsmanship and architectural taste.When possible, repairs should be done in-situ. Repairing the worst areas of decay can be done using proprietary resin-based systems.DurabilityThe windows made of timber in many historic buildings were built to last for centuries. However, they do need to be maintained to ensure they look good and functioning properly. The most frequent maintenance tasks are repairs to sash-cords as well as tightening sash pulleys and painting. There is also a growing demand to upgrade the timber windows to increase the efficiency of energy. This could mean replacing old glazing units, repairing existing window rebates or putting in new cills that allow for improved air sealing.One of the major issues with traditional windows is the damage caused by corrosion of the paintwork. This is especially true in the case of sash windows as the gaps between sashes can be extremely large. In these situations, water can penetrate paint film and cause rotting to the putty or wood beneath. The rotting may be further aggravated by poor weather conditions. To prevent this windows, they should be painted regularly using an exterior wood paint that is suitable.Areas that have been damaged must be repaired using a resin-based product. This will ensure that the maximum possible amount of the original fabric is retained. It is also necessary to limit the number of holes that are drilled into the frame for cable entry, as they could admit water and lead to decay.Another issue 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 the sash not fitting properly jamming, sticking or sagging in the opening, and broken glass. Often this can be corrected through the installation of new sash boxes that have been constructed from slow-growing deal (pine) or oak. The cill must be made from a sturdy hardwood, like oak, in order to prevent any differential movement between new and older work.To alleviate this issue There are several companies that make Boston pattern sash made of wood that can be fitted into most openings. These sash come in a variety of sizes and finishes that suit the needs of modern-day homeowners. The new sash, combined with quadruple draft strips and improved thermal insulation can make a significant difference to the energy-efficiency of a home.AestheticsMany old wooden windows have an excellent aesthetic value as they often illustrate, in some way, the materials and technology and architectural style of the time in which they date. They could have significant historical significance in their own right. This is particularly true of early unglazed window openings in timber framed buildings which were simply a series of openings in the frame, which were divided horizontally into mullions and vertical iron or wood bars to keep out intruders.It is essential to preserve the appearance of traditional timber window joinery. As soon as you notice any signs of decay caused by moisture penetration it is crucial to stop it. It is recommended to do this with thorough painting, especially if there is damage or degradation. It is advisable to use paints designed to be used as part of the system (primer undercoat, finish) and follow the manufacturer's guidelines in relation to preparation and the amount of coats needed at each stage.The fungus that causes wet rot can spread quickly in old windows made of wood. To prevent this from happening, take out any damaged or rotten parts as quickly as you can. The replacement of wood that is rotting must be done with care by using a slow-growing deal (pine) and, if feasible it is the same species as that which is being removed in order to prevent any movement differences between the new section and existing timbers.Glass became cheaper and more abundant during the late medieval period and into the 17th century. This led to glazed openings on timber-framed houses were more elaborate, with moulded mullions, tracery made of wood and cills that protruded deep. In the past, more often, the glass was laid within rebated frames and pinned in with 'glazing sprigs' rather than being inserted into lead cames. This method of glazing is not just less prone to leaks but it also allows larger clearer, more transparent sheets of glass to be used in the windows than would be possible without the need for lead lights.Energy efficiencyTraditional timber windows are energy efficient because of their thickness and multilayer construction as well as focus on particulars. They also feature large glass areas and projection cills which reduce air infiltration. The windows can be made to improve their energy efficiency through draughtproofing and secondary glazing. However it is crucial to remember that such measures should be evaluated in relation to the overall appearance and integrity of the window in its original form.As a result, retaining existing historic windows that require repair rather than replacing them makes sense especially when their thermal enhancements can be achieved inexpensively with simple repairs and improvements. Older windows are usually of historical significance, since they show a range in technical development and changes to the architectural style. Many people believe that the windows will need to be replaced in the near future. However, they will last for 150, 200, or even 250 years if you take care of maintenance.It is crucial to understand that decay problems with traditional timber windows can be preventable by timely and thorough repairs. It is also crucial to recognize damp issues and address them promptly so that you can avoid serious damage. Early paint deterioration can be a problem because it allows moisture to get into the wood, which can cause wet rot. The damage is usually not evident until the paintwork becomes wavy or cracked however, it can cause serious structural damage, and could lead to further decay.A quality paint will stop moisture from entering the paint. To prevent condensation and mould it is crucial to keep the paintwork as clean as possible. Modern synthetic paints could be a problem, as they are often made to be water-resistant and this can cause the growth of mildew inside the window frame.The majority of windows from the past were constructed of sapwood-rich timber. These timbers are susceptible to deterioration quickly when exposed to moist weather conditions, but they can be preserved with a thorough preservative treatment before they are put to use. It is also crucial to ensure that the type of timber used is well-suited to the site and climate conditions, as these elements will influence the durability of the joinery. Local window manufacturers produce a range of sash made of timber that can be customized to fit specific openings in historic buildings. They can be made in the standard Boston pattern or in custom sizes that can be adapted to historic buildings.MaintenanceRegular inspections, careful redecoration, and prompt repairs can extend the life of wooden windows. The main cause of decay is moisture leaking through deteriorated paint or putty. This can be prevented by using a high-quality wood preservative and painting the wood thoroughly.Repairs to sash windows that are old and window frames made of casement should be done with care and with minimal disruption. Many traditional timber window designs can be repaired without removing the frame, and this approach should be used whenever it is possible. Remove peeling or loose paint and lightly sand the area to improve the 'key" of the surface. This will enable the new coating to adhere better. Care should be taken to avoid stripping old paint layers that may have historic value, and where these are present it is recommended that a paint analysis be carried out.If a piece of wood is rotting 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 junction between the masonry sub-cill and the timber cill should be sealed.Replacement of traditional windows with PVC-u is a tempting option, especially when the installer provides a 'one stop shop' installation that handles removal and replacement within one day. It is crucial that installers of replacement windows have a thorough understanding of the history and design of traditional timber frames. This will allow them to make the right suggestions for energy efficiency improvements and other technological upgrades that will not harm the historical character of a 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 under Building Regulations. A skilled carpenter can put in PVC-u Windows that are sympathetic to original building's character. This is particularly true where windows are situated in listed buildings and conservation areas.