effectshadow25

Maintaining Timber Windows A well-maintained wooden window is an important element of a building that is historic. It reflects in different levels, the materials and technologies of the time in which it was constructed, as well as the design and craftsmanship. Whenever possible repairs to existing windows are required, they should be made in-situ. The repair system that is based on resin can be used to repair the most deteriorated areas without removing the entire window. Durability Timber windows were built to last for hundreds of years. They do require maintenance to keep them looking great. The most frequent maintenance tasks include sash-cord repairs, re-tightening sash pulleys, and painting. The demand for enhancing timber windows in order to improve energy efficiency is also growing. This can include replacing old glazing units, repairing existing window rebates or installing new cills to improve air seal. A key problem with traditional windows is the damage caused by the corrosion of the paintwork. This is especially important when sash windows are concerned as the gaps between sashes may be very large. In these situations water may get through the paint film and cause decay of the putty and the wood underneath. The weather can be a factor in accelerating the rotting. To stop this from happening, windows need to be painted regularly with an exterior wood paint. In addition to repainting, corroded areas must be repaired using a resin-based repair product. This will ensure that the maximum amount of the original fabric is retained. It is also important to reduce the number of holes that are drilled into the frame for cable entry, as they could allow water in and cause decay. Another significant problem with older windows is the structural movement within the wall, which can cause deformation of the frame and the sash. This can result in the sash not fitting properly and jamming or sticking into the opening, or breaking glass. Most often, this is corrected by the fitting of new sash boxes that have been constructed from slow-growing deal (pine) or oak. The cill should be made of a durable hardwood like oak to avoid any movement between the new and existing work. There are a variety of companies that manufacture Boston pattern wooden sash to fit most existing openings. The sash is available in various sizes and finishes that meet the requirements of modern-day homeowners. The new sash, combined with quadruple draft strips and a better thermal insulation, can make a huge difference to the energy-efficiency of a home. Aesthetics Many old timber windows have a great aesthetic value because they typically show, in a particular way, the materials and technology and architectural taste of the period from when they were built. They may also have a significant historic value in their own right. This is particularly true of early windows that were not glazed in timber-framed structures, where the majority were simply a series of openings in structural frames that were subdivided horizontally by mullions, and vertically by iron or wood bars to protect against invaders. Traditional window joinery made from timber is a beautiful feature of a building and is crucial to maintain its appearance. It is essential that any decay resulting from moisture penetration should be stopped as soon as it is discovered. This can be done by applying a thorough coat of paint, particularly in areas where there has already been damage or degradation. It is best to choose paints that are intended to be used in a set (primer undercoat and finish), and to follow the manufacturer's guidelines for preparation and number of coats at each stage. Wet rot is a common issue in older timber windows. The best method to stop it from growing is to eliminate any damaged or rotten parts as soon as possible to stop the spread of the fungus that causes it. The replacement of wood that is rotting should be done with care and using slow grown deal (pine) and, whenever possible, the same species as which is being removed to avoid differential movement between the new section and existing timbers. Glass became less expensive and more abundant during the late medieval period and into the 17th century. In the process, the glazed openings in timber-framed homes were more elaborate, with moulded mullions, tracery made of wood and cills that protruded deep. Increasingly, the glazing was placed within frames with rebates and then pinned with 'glazing sprigs' rather than into lead cames. This method of glazing is not only less prone to leaks but also allows for more expansive and clearer sheets of glass to be used in the windows than would have been possible without the need for lead lights. Energy efficiency Traditional timber windows offer an excellent energy performance due to their thickness, multi-layer construction and very attentive attention to detail. They also have large glass areas as well as deep projecting cills that minimise air infiltration. upvc locksmith cambridge can be made to increase their energy efficiency by draught-proofing and secondary glazing. However it is essential to remember that such measures should be evaluated in the context of the overall quality and appearance of the original window. So, retaining old windows that require repair instead of replacing them makes sense particularly when thermal improvements can be achieved cost-effectively through simple repairs and upgrades. Older windows typically have an historic value that demonstrates a range of technical development and changes in architectural tastes. The pressures to replace such windows are usually based on the assumption that windows that are old will need to be replaced in the near future, however they are capable of serving for 150, 200 or even 250 years, if properly maintained. It is important to recognise that the decay problems that are typical of timber windows can be prevented by thorough maintenance and prompt repairs. In addition it is vital to identify damp penetration problems and to remedy them quickly to avoid serious damage. The early deterioration of paint is a major issue, because it allows moisture to penetrate the wood and cause wet rot. This type of damage is typically not noticed until the paintwork is wavy or cracked, but can cause significant structural damage and lead to further decay. A good paint will prevent moisture penetration. It is also essential to keep the paintwork in good condition to avoid condensation and the growth of mould. Modern synthetic paints are problematic because they are often water-resistant and may cause mildew to grow in the window frame. The majority of older windows were constructed from sapwood-rich timber. These timbers can deteriorate quickly when exposed to rain, but they can be protected with a thorough preservation treatment before use. It is important to choose the right kind of wood for the site and climate, as these factors can affect the longevity of the joinery. Local window manufacturers have a wide range of timber sash which can be customized to fit historic openings. They can be produced in the standard Boston pattern or in custom sizes that can be adapted to the architectural style of historic buildings. Maintenance Regular inspection, careful redecoration, and timely repairs can prolong the life of wooden windows. The major cause of decay is moisture penetration through deteriorated paint or putty. This can be prevented by careful painting and the use of a good quality wood preservative. Repairs to old sash windows as well as casement window frames should be done with care and with minimal disruption. Repairs can be made to the majority of traditional wooden window designs without having to remove the frame. This is a must whenever it is possible. Remove peeling or loose paint and lightly sand the area to improve the “key” of the surface. This will allow the new coating to adhere better. It is crucial to not remove old paint layers, which may have historical significance. If a portion of wood is decayed, the best solution is to remove it and replace it with timber inserts that are shaped to match the existing profiles. The timber that is inserted should be treated with wood preservative. The junction between masonry sub-cills and timber cill should be sealed. Replacement of windows made of traditional PVC-u is an appealing option, particularly when the installer offers an “all-in-one” installation service that can handle removal and replacement in the span of a day. However, it is crucial that the person who installs windows replacement has a thorough understanding of the construction and history of traditional timber frames. This will enable them to make the appropriate recommendations for energy-efficiency improvements and other technological upgrades that won't affect the appearance of a historic building. Those who provide replacement windows should be registered with a Competent Persons Scheme, such as FENSA. This will ensure that the replacement windows are approved as a suitable solution in accordance with Building Regulations. A skilled carpenter can put in PVC-u Windows that are sympathetic to the original character of the building. This is particularly true where windows are installed in listed buildings or conservation areas.