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How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have sash windows that are traditional and homeowners are proud of how they look. However, sash windows can get stuck and be difficult to open or close. This is typically due to moisture, which can cause the wood to expand.

Box sash windows were previously operated using chains, cotton cords and lead weights. Modern windows with sash springs are concealed to solve this problem.

1. Aesthetics

Contrary to PVC-u windows which are manufactured according to imperial sizes that are modular the timber sash windows are able to be restored to their original sizes. This permits the re-installation of timber sash windows in order to meet the current energy requirements and comply with conservation regulations for areas. upvc door repairs offers windows that have a superior appearance than uPVC alternatives.

Sliding sash windows were initially only used in large buildings or public buildings, however this changed when production was less expensive and craftsmen were able to create larger frames using more glass. By the late 18th century sash windows were the dominant design of wood in the majority of British homes. Since they were easy to open, sash windows let light into rooms without curtains.

Early windows were simple glass, but in the 17th century, sash windows started to become more attractive with coloured glass bars and moulded mullions. They were expensive initially, but as glass production became less expensive and more efficient, they were a common feature in many historic homes.


By the 19th century it was possible to create large, strong glass that did not require support bars. This allowed the frame to be made bigger which, in turn, provided an improved view. This was a very important advancement.

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

Oak was used for older examples and for more prestigious buildings. A parting bead is used to separate the two sashes. It is important that this is maintained to prevent rattles and drafts. It is also crucial that sash pulleys and idler wheels are kept in good condition as these help to operate the window.

2. Energy efficiency

As clearer and larger glass sheets became available, sash window began replacing hinged casements. Glass plates were set in frames made of timber, which were which were pinned with glazing sprigs, and putty was sprayed on the frame's sides to ensure watertightness. This form of glass gradually replaced the leaded light bulbs.

The introduction of sashes created a need for a much larger variety of ironmongery including the most basic fittings, brass pulleys and lead (and later cast iron) weights, sash stops shutter hinges, knobs and shutters as well as a range of fasteners to hold the sashes in the right place. They were often decorated with motifs, inscriptions and engraved patterns that identified the maker.

Sash windows can be very energy efficient if they are maintained regularly. However, if they are not maintained, they can become draughty and let in cold air. Paint and putty may also cause draughts. This issue can be fixed by using wood-to-timber products.

The industry of replacement windows relies heavily on the notion that old windows are beyond repair and are not able to be maintained economically. However, they can easily be maintained with a little attention. However, these repairs are costly and can cause considerable disruption to the home. Many homeowners opt to replace their windows with PVC-u from a large "one-stop shop" company for installation. They can replace all windows in a house in one day, thereby saving time and avoiding the need for different tradesmen to coordinate. They can also be supplied with 'energy-saving' double-glazing to achieve higher energy efficiency ratings than those offered by traditional windows with sash. These double-glazed units are not able to replicate the proportions or section of the sashes made of timber from the past.

3. Security

It is possible to secure windows that are traditional without compromising their style. A variety of ironmongery types can be installed with sash chains, mortice bolts, and locks for sash. They can be fitted in a way that the window is open to allow ventilation or cleaning. They are generally not noticeable, since they are designed to fit the sash window. They can be used in conjunction with traditional sash window catches. These should be replaced with more robust models, such as ones that have double screws or spring levers to decrease the risk of being hammered.

Sash-window frames were made from slow-growing deal or, in more prestigious houses made of oak. If the glazing bars are still in good condition and in good condition, they should be kept. If possible, the timber cills should be replaced with timber that is compatible with. PVC-u companies often provide a one-stop shop installation service, removing and replacing windows across a house in a day without the need to engage other tradespeople, or coordinate visits from different suppliers.

4. Ventilation

When sash windows were first introduced in the 17th century they allowed a large amount of light into structures. At the end of the 18th century, they were adapted to allow even more light into rooms and larger glazing panes began to be manufactured. The result was a lighter appearance and windows that were more elegant.

Sash windows were introduced that required a brand new range ironmongery. Early pulleys were of wood, while later Victorian ones could be made from brass or a mixture of lead and wood, and there were many kinds of shutter hinges and knobs. These ironmongery pieces must be maintained and cleaned to appreciate their exquisite design.

To ensure they remain in good shape, timber windows require regular maintenance. A lack of attention to them regularly could cause:

Sashes that no longer slide easily.

Holes in the frame that allow water to enter and cause damage and decay.

The putty can be soaked by water and cause decay to the frame or cause 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 revealed that traditional softwood sash windows are just as efficient thermally as PVC-u double-glazed windows, and can be more attractive than the sleek lines of modern casement windows.

The replacement window industry has done a lot to convince homeowners that their traditional windows are dirty, noisy and beyond economic repair. Many old windows made of timber can be repaired and used for many more years with minor repairs.

5. Maintenance

Traditional sash windows require regular maintenance and inspection. If you do not maintain your sash window, it could lead to the sash cords breaking and the glazing bars wearing out excessively. It can also cause paint and putty to degrade. The removal of sashes can also result in structural shifts within the frame, which causes the sash to move out of alignment and unable to close correctly. It is also possible for the sash be snagged or fixed in an open position and let water and draughts into the structure.

Moisture penetration is a frequent cause of damage to timber windows. This can be prevented by thorough painting, periodic repairs and elimination of the cause of dampness. Wet rot is recognisable by the wavy appearance of the paint that can be stripped to reveal rotting, soft timber. Any rotten sections of timber should be cut off and the affected area should be carefully scarfed or pieced in using replacements made of the same type of wood as the ones remaining. This method of repair maximizes the amount of fabric that is left and is among the least invasive methods of treating decay caused by timber.

The use of a resin-based wood consolidant is another alternative to the traditional method of sanding and staining. It is brushed onto the surface of the wood to protect it and strengthen it. It is particularly useful for the treatment of pulley cords and sash which can help prevent breakage.

It is important to restore and not replace any old ironmongery such as stay latches and sash latches. It can be difficult to replace these items without altering their original design. It is also recommended that modern aluminium fittings like sashlifts and chainstays, should be avoided since they can cause corrosion and deterioration of timber frames and sashes.