Notes

7 Things You Didn't Know About Cambridge Window
Maintaining Timber Windows

A well-maintained window made of timber is a significant element of the historic fabric of a structure. It demonstrates in various degrees the different materials and technologies as well as the craftsmanship and architectural style of the period from which it originates.

If repairs are possible to windows that are already in use should be carried out in situ. Repair systems made of resin can be used to fix the most damaged areas of decay without removing the entire window.

Durability

The windows made of timber in many historical buildings were built to last for centuries. But, they have to be maintained to keep them looking great and working correctly. The most common maintenance tasks include repairs to sash cords and re-tightening the sash pulleys and painting. There is also a growing demand to upgrade the timber windows to improve energy efficiency. This can include replacing old glazing units, repairing 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 particularly true when windows made of sash are involved because the gaps between sashes can be quite large. In these cases water can enter the paint film and cause rotting to the wood or putty underneath. The rotting can be exacerbated by weather conditions that are not ideal. To stop this from happening, windows must be regularly painted with an exterior wood paint.

In double glazing cambridge to repainting, areas that have corroded need to be repaired with a resin-based repair product. This will ensure that the maximum possible amount of the original fabric is retained. It is important to minimize the number of holes that are drilled in the frame to allow cable entry since they can let in moisture and cause decay.

Another major issue with older windows is the structural movement within the wall, which can cause deformation of the frame and the sash. This could result in the sash not fitting properly and jamming or sticking into the opening, and broken glass. This can often be fixed by the fitting of new sash boxes that have been made from slow grown deal (pine) or oak. The cill needs to be constructed from a sturdy hardwood, such as oak, to prevent shifting between the new and existing work.

There are a variety of companies that make Boston pattern wooden sash that fit most existing openings. They are available in a variety of sizes and finishes to suit the requirements of the modern homeowner. The new sash, coupled with quadruple draft strips and a more efficient thermal insulation, could make a significant difference to the energy-efficiency of a home.

Aesthetics

Many old timber windows have a great aesthetic value since they usually demonstrate, in a way, the materials and technology and architectural taste of the period from which they originate. They may also have significant historical value in their in their own right. This is particularly true of windows that were unglazed in the early days of timber-framed structures, where the majority were series openings in structural frames that were subdivided horizontally by mullions and vertical iron or wood bars to protect against intrusions.

Traditional timber window joinery is a beautiful element of a structure and it is important to keep it looking good. It is crucial that any decay resulting from the penetration of moisture should be stopped as soon as it is recognised. It is best to do this with thorough painting, especially where there is damage or degradation. It is recommended to choose paints that are intended to be used in a set (primer undercoat and finish) and follow the manufacturer’s recommendations for preparation and number coats at each stage.

The fungus responsible for wet rot is able to spread quickly in old windows made of wood. To prevent this, take out any damaged or rotten components as promptly as you are able to. The replacement of rotting timber must be done with care with a slow-growing deal (pine) and, wherever feasible, the same species as that which is being removed to prevent differential movement between the new section and the existing timbers.

Glass became less expensive and more abundant during the late medieval period and into the 17th century. This led to the openings for glazed windows on timber-framed houses were more elaborate, with moulded mullions and traceries, made of wood and cills that protruded deep. Increasingly, the glazing was set within rebated frames and then pinned with 'glazing sprigs' rather than being inserted into lead cames. This method of glazing not only makes windows less likely to leak and also allows wider sheets of clearer glass to be used than would have been possible otherwise without the use of led lights.


Energy efficiency

The traditional timber windows are energy efficient due to their thickness, multilayer construction and attention to detail. They also feature large glass areas as well as deep projecting cills that reduce air infiltration. Windows can be designed to improve their energy efficiency with draught-proofing and secondary glazing. It is essential to remember that these measures should be taken into consideration in relation to the overall integrity and look of the original windows.

So, retaining existing historic windows that require repair rather than replacing them makes sense particularly when thermal enhancements can be achieved cost-effectively through simple repairs and upgrades. Historic windows are often of historical value, as they reflect a variety of technological advancements and changes to architectural style. Many people believe that these windows will have to be replaced in the near future. However, they will last for 150, 200, or even 250 years if they are maintained with proper maintenance.

It is crucial to recognize that the decay issues that are typical of windows made of timber can be avoided by regular maintenance and swift repairs. In addition, it is essential to identify damp penetration problems and address them swiftly to avoid major damage. Early paint deterioration is a concern because it allows moisture to get into the wood, leading to wet rot. It is not uncommon for this type of damage to go unnoticed until paintwork starts to crack or turn wavy. However, it can cause structural damage and then further decay.

A paint of good quality will stop moisture from entering the paint. It is also necessary to keep the paintwork in good condition in order to prevent condensation and mould growth. Modern synthetic paints pose a problem because they are water-resistant and can cause mildew to develop in the window frame.

Most older windows were made of sapwood-rich timber. The timbers will deteriorate rapidly if exposed to rain, but they can be protected with an extensive preservation treatment prior to use. It is essential to select the right type of wood for your location and the climate, since these factors can affect the durability of the joinery. Local window manufacturers provide a wide range of timber sash which can be made to fit the historic openings. They are available in the standard Boston pattern or in custom sizes that can be adapted to historical buildings.

Maintenance

The lifespan of windows made of timber can be extended through regular inspections carefully redecoration, and prompt repair. The main cause of decay is the infiltration of moisture through deteriorated putty and paint. This can be avoided by careful painting and using an excellent wood preservative.

Repairs to old sash windows and window frames made of casement must be done with care and minimal disruption. Repairs can be made to many traditional timber window designs without taking the frame off. This is a must whenever it is possible. 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. Care should be taken to avoid stripping old paint layers that might have historical significance If these are present, it is recommended that a paint analysis be carried out.

When a piece of wood has become rotten the best option is to eliminate the rotten material and replace it with spliced-in inserts that are shaped to match the existing profiles. The timber inserts should be treated with wood preservative. The junction between the masonry sub-cill and the timber cill should be sealed.

Replacement of windows made of traditional PVC-u can be an attractive option, especially when the installer offers an "all-in-one" installation service that can handle removal and replacement within a day. It is crucial that the person who installs replacement windows has a complete knowledge of the structure and history of traditional wooden frames. This will enable them to make the appropriate recommendations for energy efficiency improvements and other technical improvements that won't harm the historic character of a building. The window installers who provide replacement windows must be registered with a Competent Persons Scheme such as FENSA. This will ensure that the replacements are approved as a suitable solution under Building Regulations. A skilled carpenter is able to install PVC-u Windows that are sympathetic to the original building's style. This is especially true when windows are situated in listed buildings and conservation areas.

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