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Maintaining Timber Windows

A well-maintained timber window is a crucial element of the historic fabric of a building. It reflects in different degrees, the materials and techniques of the time period it was constructed, as well as the craftsmanship and architectural taste.

When possible, repairs to upvc doors should be made on-site. Repairing the most deteriorated areas of decay can be done using proprietary resin-based systems.

Durability

Timber windows were built to last hundreds of years. They do require some maintenance to keep them looking good. The most common maintenance tasks include sash-cord repairs and re-tightening the sash pulleys and painting. There is a growing need to upgrade timber windows to increase the efficiency of energy. This may include replacing old double glazing repairs near me units, fixing the window rebates that are in place or installing new cills to increase the air seal.

The corrosion of paintwork is a major problem with traditional windows. This is especially important in the case of sash windows because the gaps between sashes may be extremely large. In these situations, water can penetrate paint film and cause rotting of the wood or putty underneath. The weather can be a factor in accelerating the rotting. To prevent this from happening, windows need to be painted regularly with an exterior wood paint.

Corroded areas should be repaired with a resin-based product. This will ensure that the maximum amount of the original fabric is preserved. It is essential to limit the number of holes that are created into the frame in order to allow cable entry since they can let in moisture and cause decay.

Another significant problem with older windows is the structural movement within the wall, which could cause deformation of the frame and the sash. This can result in the sash not fitting properly, sticking or jamming in the opening and cracked glazing. This can be corrected often by fitting new sash frames constructed of slow-grown deal (pine) or oak. The cill should be constructed of a strong hardwood like oak, in order to prevent any differential movement between new and existing work.

There are several companies that produce Boston pattern wooden sash that fit into the majority of existing openings. The sash is available in a range of sizes and finishes to meet the needs of the modern homeowner. In conjunction with quadruple draught strip and improved thermal insulation, these new sash options can make an enormous difference to the energy efficiency of a house.

Aesthetics

Many old wooden windows have an excellent aesthetic value since they usually demonstrate, in a way the materials and techniques and architectural taste of the time from which they date. They could have significant historical significance on their own. This is especially true of windows that were unglazed in the early days of timber framed buildings where the great majority were merely a series of openings within the frame, which were divided horizontally into mullions, and vertically into iron or wood bars to keep out intruders.

Traditional window repair joinery made of timber can be a stunning aspect of a building, and is crucial to keep its appearance. It is essential that any decay caused by the penetration of moisture should be stopped as soon as it is recognised. It is recommended to do this by thorough painting, especially if there is damage or degradation. It is advisable to use paints that are designed to be used as part of the system (primer as well as undercoat, finish and primer) and follow the manufacturer's guidelines in relation to preparation and the number of coats needed at each stage.

Wet rot is a common issue in old timber windows. The best way to stop it growing is to eliminate any damaged or rotten sections as soon as you can to stop the spread of the fungus that causes it. Replace rotting wood with slow-growing deal (pine) and, when possible, the exact type of timber as the one that is being removed to prevent any differential movement.

Glass became cheaper and more abundant in the late medieval period and into the 17th century. In the process, glazed openings on timber-framed houses were more elaborate, with moulded mullions and traceries, made of wood and cills that protruded deep. In recent times, glass was fixed to frames that were rebated with glazing sprigs instead of lead cames. This method of glazing not only makes windows less likely to leak, but also allows for larger sheets of glass to be used than would have been possible otherwise without the use of leaded lights.

Energy efficiency

Traditional timber windows provide excellent energy efficiency due to their thickness, multi-layer construction and very meticulous attention to detail. The large glass areas, the deep projecting cills and large glazing areas help to reduce air infiltration. With secondary double glazing cambridge and draught proofing, windows can be made more efficient to increase their energy efficiency. However it is essential to keep in mind that any such measures must be considered in relation to the overall integrity and appearance of the original window.

So, retaining the existing windows from the past that require repair rather than replacing them makes sense, particularly when their thermal improvements can be achieved economically through simple repairs and upgrades. Older windows typically have a historical value that demonstrates a range of technological advancement and changes in architectural taste. The pressure to replace these windows are usually based on the assumption that old windows will need replacement in the near future, but the majority of them are capable of providing service for 150, 200 and even 250 years, if properly maintained.

It is important to recognise that the decay issues that are associated with traditional timber windows can be prevented by regular maintenance and prompt repairs. Additionally it is vital to identify damp penetration problems and fix them promptly to avoid major damage. The early deterioration of paint is a major problem as it allows moisture to penetrate the wood and cause wet rot. It is not uncommon for this type of damage to go unnoticed until the paintwork begins to crack or becomes wavy. However, it can cause structural damage and lead to further decay.

A good quality paint will stop this moisture penetration. To prevent mould and condensation it is essential to keep the paintwork as clean as you can. Modern synthetic paints can pose a problem since they are typically made to be water-resistant which can lead to the formation of mildew inside the window frame.

The majority of windows from the past were manufactured from timber containing an extensive proportion of sapwood. These timbers can deteriorate very quickly when exposed to wet weather, but can be protected with a thorough preservative treatment before they are used. It is important to choose the appropriate type of wood for the site and climate, as these factors can affect the longevity of the joinery. Local upvc window and door repairs manufacturers create various types of timber sash that can be adapted to fit specific historic openings. They can be produced in the standard Boston pattern or in custom sizes to suit historic structures.

Maintenance

The life of timber windows can be extended by regular inspection, careful redecoration and prompt repair. The primary cause of decay is the infiltration of moisture through deteriorated paint and putty. This can be prevented by using a good wood preservative and thoroughly painting the wood.

Repairs to old sash windows as well as casement window Mechnism repair frames must be done with care and minimal disruption. Many of the traditional designs for timber windows can be repaired without removing the frame, and this method should be followed whenever possible. Remove peeling or loose paint and then lightly sand the surface to improve the "key" of the surface. This will enable the new coating to adhere better. Be careful to avoid stripping old paint layers that could have historical value If these are present, it is recommended that a paint analysis be conducted.

If a portion of wood has rotted, the best solution is to take it off and replace it with timber inserts that are shaped to match the existing profiles. The wood that is being inserted should be treated with a wood preserver and the joint between the timber cill and the sub-cill of the masonry should be sealed.

It's tempting to replace traditional windows with PVC u, especially when the installer offers an 'all-in-one' installation which includes removal and replacement in one day. It is crucial that installers of replacement windows have a deep understanding of the history and construction of traditional timber frames. This will enable them to make the appropriate suggestions for energy efficiency improvements and other technical upgrades that won't harm the historical character of a building. Anyone who installs replacement windows should be registered with 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 put in PVC-u windows that are suited to the original character of the building. This is particularly true where windows are installed in listed buildings or conservation areas.