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Maintaining Timber Windows

A well-maintained window made of timber is a crucial element of the historical structure of a building. It is a representation of the different materials and technologies design, craftsmanship and aesthetics of the period from which it originates.

When possible, repairs should be made on-site. The repair system that is based on resin can be used to repair the worst areas of decay without removing the whole window.

Durability

Timber windows were made to last for hundreds of years. They do require maintenance to ensure they look good. Maintenance tasks include repairs to sash cables and retightening pulleys on sash, and painting. The need to upgrade timber windows to improve energy efficiency is also growing. This could mean replacing old glazing units, repairing the window rebates that are in place, or installing new cills that allow for better air sealing.

One of the major issues with traditional windows is the damage caused by corrosion of the paintwork. This is especially important where windows made of sash are involved because the gaps between sashes can be quite wide. In these situations, water can penetrate the paint film and cause rotting of the putty as well as underlying wood. The weather can be a factor in accelerating the rotting. To stop this from happening, windows should be regularly painted with an exterior wood paint.

Areas that have been damaged must be repaired with resin-based products. This will ensure that the highest possible amount of the original fabric is retained. It is essential to limit the number of holes that are made into the frame to allow cable entry as these can admit moisture and cause decay.

The wall's structural movement could also cause distortions in the frame and sash. This can lead to sash no longer fitting correctly and jamming or sticking to the opening and broken double glazing Seal repairs. This can be corrected often by putting in new sash frames constructed of slow-growing deal (pine), or oak. The cill should be constructed of a durable hardwood like oak to avoid any movement between the existing and new work.

To help reduce this problem, there are now a number of companies who produce Boston pattern wooden sash that will fit into the majority of existing openings. These sash come in various sizes and finishes that will suit the needs of modern homeowners. Together with quadruple draught strips and a better thermal insulation, these new sash can make significant improvements to the energy efficiency of your home.

Aesthetics

A lot of old timber frames have a high aesthetic appeal, as they show, in some shape, the materials technology, design, and style of the time they were built. They may also have significant historical value as a set. This is particularly true for early windows that were not glazed in timber-framed structures, where the majority were series openings in structural frames that were subdivided horizontally by mullions and vertical iron or wood bars in order to protect against invaders.

It is important to maintain the appearance of traditional wooden window joinery. It is essential that any decay that results from the penetration of moisture should be removed as soon as it is identified. This can be done by painting thoroughly, especially in areas in which there is already damage or deterioration. It is advisable to use paints that are specifically designed to be used part of a system (primer, undercoat and finish) and follow the manufacturer's instructions in terms of preparation and the number of coats required at each stage.

Wet rot is a common problem for older timber windows. The best method to stop it from growing is to eliminate sections that are damaged or rotten immediately to stop the spread of the fungus responsible for it. Replace rotting wood with slow-growing deal (pine), and should it be possible, the same type of timber as the one that is being removed to prevent the possibility of differential movement.

Glass became cheaper and more abundant in the late medieval period and into the 17th century. As a result, glazed openings on timber-framed houses became more complicated with moulded mullions, wooden tracery and deep cills projecting into the air. In recent times, glass was fixed into frames that were rebated with glazing sprigs instead of lead cames. This method of glazing is not just less prone to leaking but it also allows much wider and clearer sheets of glass to be used in the windows than would otherwise have been possible without the need for leaded lights.

Energy efficiency

Traditional timber windows are energy efficient because of their thickness, multilayer construction and focus on detail. The large glass areas, the deep projecting cills, and the large glazing areas reduce air infiltration. With secondary glazing and draughtproofing, windows can be upgraded to improve their energy efficiency. It is essential to remember that these measures need to be considered in relation to the overall appearance and integrity of the original windows.

So, retaining old windows that are in need of repair instead of replacing them is logical especially when their thermal improvements can be achieved cost-effectively through simple repairs and improvements. Older windows typically have a historical value that illustrates a variety of technical development and changes in architectural style. Most people think that these windows will have to be replaced in the near future. However, many of them can still provide service for 150,200, and even 250 years if you take care of maintenance.

It is essential to realize that decay problems in traditional timber windows are avoidable with prompt and thorough repairs. In addition it is crucial to recognize damp penetration issues and to remedy them quickly to avoid major damage. The early deterioration of paint is a particular problem, because it allows moisture to penetrate the wood and cause wet rot. It is not uncommon for this type of damage to go undetected until the paintwork begins to crack or becomes curly. However, it can cause structural damage and then further decay.

A high-quality paint will prevent this moisture from entering. It is also important to keep the paintwork spotless in order to prevent condensation and the growth of mould. The use of modern synthetic paints can be problematic because they are usually formulated to be water-resistant, and this may result in the formation of mildew within the window repair frame.

The majority of older windows were constructed from sapwood-rich timber. These timbers can deteriorate quickly when exposed to rain, however they can be protected by an extensive preservation treatment prior to use. It is also important to ensure that the type of wood used is suited to the site and climate conditions, as these elements affect the durability of the joinery. Local window manufacturers have various types of timber sash which can be customized to fit historic openings. They can be made in the standard Boston pattern or in custom sizes that can be adapted to historical buildings.

Maintenance

Regular inspection, careful redecoration, and timely repairs can prolong the life of wooden windows. The main cause of decay is moisture penetration through the deteriorated paint and putty. This can be avoided with thorough painting and using high-quality wood preservative.

Repairs to sash windows that are old and plastic window repair frames made of casement should be done with care and with the least amount of disruption. Repairs can be made to the majority of traditional wooden upvc window repairs near me designs without taking the frame off. This should be done as often as is feasible. Remove loose or peeling paint and then lightly sand the surface to improve the "key" of the surface. This will allow the new coating to stick better. It is crucial to not remove old paint layers, which may have historical significance.

If a piece of wood is rotting the best way to deal with it is to take it off and replace it with timber inserts shaped to match existing profiles. The wood that is inserted should be treated with a wood preservative and the connection between the timber cill and masonry sub-cill should be sealed.

It's tempting to replace traditional windows with PVC U, particularly if the installer offers an installation that includes removal and replacement in a single day. It is important that the installers of replacement windows have a deep understanding of the history and design of traditional timber frames. This will allow them to make appropriate recommendations for energy-efficiency improvements and other technological upgrades that won't affect the appearance of a historic building. The windows that are replaced should be registered under a Competent Persons Scheme such as FENSA. This will ensure that the replacements are approved by the Building Regulations as a suitable alternative. A skilled carpenter can put in PVC-u windows that conform to the original building's style. This is especially applicable when windows are located within listed buildings or conservation areas.