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How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge feature traditional sash window and the homeowners are proud of their appearance. Sash windows can become stuck and become difficult to open and close. This is usually due to moisture which can cause the wood to expand.

Box sash windows were traditionally operated by chains or cotton cords as well as weights made of lead. Modern sash window springs are hidden to avoid this issue.

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows that are made in imperial sizes and are modular, are able to be restored to their original size. This permits the re-installation of timber sash windows in order to meet the current energy requirements and to comply with conservation regulations for areas. It also provides windows with a superior appearance than emergency upvc door repairs alternatives.

wooden sliding doors cambridge sash window frames were initially intended for large structures or public buildings. However the production became more affordable and artisans could create larger frames using greater glass. By the end of the 18th century, sash windows were the most popular wooden windows and doors cambridge style in British homes. As they were easy to open, sash windows let light into rooms without the need for curtains.

Early windows were simple glass but by the 17th century sash windows were becoming more attractive with coloured glass bars and moulded mullions. These were very expensive at the time but as glass production improved and cheaper they became a feature of many period houses.

In the 19th century, it became possible to produce large, strong glasses that didn't need support bars. This allowed for the frame to be enlarged, which in turn gave a better view. This was a significant advancement.

Another important improvement was the introduction of the double-hung sliding window at the end of I920s and the beginning of the I930s. This allowed both the upper and lower sash to be opened simultaneously, and gave improved ventilation to the building.

The most popular kind of sash is made from slow grown deal (pine) but oak was also used in more luxurious buildings and in earlier examples. A parting bead separates the two sashes and it is essential that it is well maintained to prevent rattles and draughts. The sash pulleys, idler wheels and sash rollers also are vital for the proper operation of the window.

2. Energy efficiency

As clearer and larger glass sheets were made available, sash windows began replacing hinged casements. Glass plates were set in frames of timber that were rebated, then which were pinned with glazing sprigs, and putty was applied to the frame's two sides to ensure watertightness. This type of glass gradually replaced leaded lights.

The introduction of sashes resulted in an need for a larger variety of ironmongery with the basic fittings being brass pulleys as well as lead (and later cast iron) weights, sash stops shutter hinges and knobs and a variety of fasteners to hold the sashes into the right place. These were often decorated with motifs, inscriptions and engravings that identified the maker.

Sash windows are energy-efficient with regular maintenance. However, without this maintenance they can become drafty and let in cold air. Paint and putty can cause draughts too. This can be remedied by making use of wood-to-timber repair tools that are proprietary.

The industry of replacement windows relies heavily on the perception that old windows are beyond repair and therefore cannot be maintained economically. However windows can be easily maintained with a little attention. However, repairs to these windows can be costly and cause significant disruption to your home. To prevent this homeowners often prefer to replace their windows with PVC-u windows made by one of the large "one stop shop" installation companies. They can replace all windows in a home in one day, saving time and eliminating the need for different tradesmen to coordinate. They are also available with 'energy saving' double-glazing to get higher energy efficiency ratings than those offered by traditional windows with sash. However these double-glazed units are unable to replicate the section and proportions of the sashes made of timber from the past.

3. Security

Traditional windows can be made more secure without compromising their aesthetics. A variety of ironmongery types are available, including sash chains, mortice bolts, and sash locks. They can be fitted in a way so that the window is able to be opened to allow ventilation and cleaning. They are generally unobtrusive, as they are designed to match the sash window. They can be utilized in conjunction with traditional sash-window catchers that should be replaced with more robust versions (such as those incorporating double screws) or spring-loaded levers to minimize the possibility of them being hammered open.

Sash-window frames were traditionally made from slow-growing deal or, in more elegant homes made of oak. When glazing bars have survived they should be kept and where it is possible, the timber of the cill should be replaced with matching wood. PVC-U companies usually offer a one stop shop installation service that can remove and replacing windows on a complete home in a single day without the need to engage other tradespeople or coordinate visits from different suppliers.

4. Ventilation

Sash windows were introduced in the 17th century and allowed for a significant amount of light to enter buildings. By the end of the 18th century they were modified to let more light into rooms, and larger glass panes began to be produced. The result was a lighter appearance and windows with more elegance.

The introduction of sash windows also necessitated the creation of a new line of ironmongery. Early pulleys were made from wood, later Victorian ones were made of brass or a mixture of lead and wood, and there were various types of shutter hinges and knobs. These ironmongery pieces should be maintained and cleaned to appreciate their beautiful design.

Timber windows require regular maintenance to keep them in good shape. Lack of regular attention may result in:

sashes that no longer slide easily.

holes in the frame that admit water that can cause decay and damage.

break down of putty allowing water penetration that could lead to decay of the frame and cill.

In the I920s and I930s, steel casement windows grew in popularity because they were strong, slim and cheap and were in line with the trend for healthy living. However, research has proven that traditional softwood sash windows are just as efficient thermally as double-glazed windows made of PVC-u, and are more attractive than the sleek lines of contemporary casement windows.

The replacement window industry has made a significant effort to convince homeowners that their traditional windows are dirty, noisy and beyond economic repair. However, many old windows made of timber are in good shape and with minor repairs to upvc doors could easily be repaired for many years to be.

5. Maintenance

Traditional sash windows require regular maintenance and inspection. Inability to keep up with this can lead to sash cords breaking, excessive wear on the glazing bars and deterioration of paint and putty. The removal of sashes can also result in structural movement within the frame which causes the sash to be misaligned and in a position that it is not able to close properly. It is also possible for the sash be snagged or fixed in the open position, which can let water and draughts enter the property.

The damage to timber windows is often caused by moisture entry. This can be prevented by regular maintenance, thorough painting and removing the cause of dampness. The paint can be removed to expose the soft, rotting wood. The sections of timber that are rotten should be carefully removed and the affected area should be snared together or pieced together using replacements of the same kind as the timber that remains. This method of repair maximizes the amount of fabric left, and is among the least invasive methods of treating timber-to-timber decay.

The use of a wood consolidant made from resin is a different option to traditional staining and sanding. This is brushed onto the surface of the timber to stabilize it and protect it from further damage. It is particularly useful for treating pulley cords and sash, where it can prevent breakage.

It is important to restore and not replace any historic ironmongery such as sash latches and stays. They can be extremely difficult to replace without harming the the original design. It is also recommended that fittings made of aluminum like sashlifts and chainstays, should be avoided since they can cause deterioration and corrosion of timber frames and sashes.