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3 Reasons 3 Reasons Why Your Sash Windows Cambridge Is Broken (And How To Repair It)
How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have sash windows that are traditional and the homeowners are proud of their appearance. Sash windows can become stuck and be difficult to open and close. This is often due moisture, which can cause the timber to expand.

Traditionally, windows made of box sash utilised chains or cotton cords and weights made of lead to operate. Modern windows with sash springs are concealed to avoid this issue.

1. Aesthetics

Contrary to PVC-u windows which are made according to imperial sizes that are modular, timber sash windows can be restored to their original size. This allows the restoration of timber sash windows in order to meet current energy requirements and comply with conservation area regulations. It also comes with an option that is superior to the uPVC alternatives.

Sliding sash windows were originally only used in large structures or public buildings, but the production process was less expensive and craftsmen were able to make larger frames with more glass. By the end of the 18th century, sash windows had become the most sought-after wooden style in British homes. Sash windows were simple to operate and allowed light to enter rooms without the need for curtains.

The first windows were made of plain glass However, by the 17th Century the sash windows began to be more decorative. They began with colored glazing bars, also known as mullions. They were costly initially, but when glass production became less expensive and more efficient, they became commonplace in many period houses.

By the 19th century it was possible to create large, sturdy glass that did not need support bars. This allowed for the frame to be enlarged which, in turn, provided an improved view. This was a significant improvement.

The introduction of the double-hung sliding sash was another important improvement that was made at the end of the I920s and beginning of the I930s. This allowed both the lower and upper sash to be opened at the same time and gave improved ventilation to buildings.

The most common type of sash is made from slow grown deal (pine) but oak was also used in more expensive buildings as well as in earlier examples. A parting bead is used to separate the two sashes. It is important that this is maintained in order to avoid rattles and draughts. It is also essential that the idler and sash pulley wheels are in good shape as they assist in operating the window.

2. Energy efficiency

Sash windows were replaced by hinged casements as larger and clearer sheets became available. They were coated with plate glass that was set within rebated timber frames and then pinned with glazing sprigs, and then putty on both sides to create a watertight seal. This type of glazing gradually superseded leaded lights.

The introduction of sashes created the need for a larger variety of ironmongery with the basic fittings being brass pulleys, lead (and later cast iron) weights, sash stops, shutter hinges and knobs and a variety of fasteners that secured the sashes into the right place. These were often decorated with motifs, inscriptions and designs that were engraved to identify the maker.

Sash windows can be very energy efficient when they are maintained regularly. However, if they are not maintained, they can become drafty and let in cold air. Paint and putty can cause draughts too. This can be remedied by using wood-to-timber repair products that are specifically designed for this purpose.

The market for replacement windows rests on the assumption that old windows are damaged and beyond repair, while they can be maintained with just a little care. However, these repairs are costly and can cause considerable disruption to the home. To avoid this, many homeowners 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 house in one day, saving time and eliminating the need for different tradesmen to coordinate. These windows can be fitted with 'energy-saving double glazing to get higher energy ratings than traditional sash window. Double-glazed windows aren't able to replicate the proportions and section of sashes from old timber.

3. Security

It is possible to secure traditional windows without compromising on their aesthetics. A variety of ironmongery types are available including sash chains mortice bolts and locks for sash. They can be fitted to ensure that the window is still open for ventilation or cleaning. These windows are typically not noticeable since they are designed to be used in conjunction with sash windows. They can be utilized in conjunction with traditional sash window catches that must be replaced by more robust models (such as those incorporating double screws) or spring-loaded levers to minimize the possibility of them being opened by hammering.

Sash-window frames are traditionally made from oak or slow-grown deal. Where glazing bars have survived they should be kept and where it is possible, the timber of the cill should be replaced by identical wood. PVC-U companies usually offer a one stop shop installation service, removing and replacing windows across a house in a day without the need to involve 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 to flood into structures. By the end of the 18th century, they were adapted to allow more light into rooms and larger glazing panes began to be produced. The result was a lighter appearance, and windows with a higher degree of elegance than before.

Sash windows were introduced that required a brand new range ironmongery. Early pulleys were of wood, whereas later Victorian ones could be made from brass or a mixture of wood and lead, and there were various types of shutter hinges and knobs. The ironmongery pieces need to be cleaned and preserved to appreciate their exquisite design.

To ensure they remain in good shape, timber windows need to be maintained. Lack of attention to them regularly can result in:

Sashes that do not slide effortlessly.

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

break down of the putty and allow water penetration, which can lead to decay in the frame and cill.

Steel casement windows gained popularity in the I920s & I930s due to their strength and slim, and also because they were cheap and complemented the trend for healthy living. Research has shown that softwood sash window are as efficient as PVC-u windows, and may even be more attractive.


The industry of replacement windows was able to convince homeowners that their old windows were rotten drafty, noisy and beyond repair. Many older timber windows can be fixed and used for a long time with minor repairs.

5. Maintenance

The traditional sash windows need regular maintenance and inspection. Inability to maintain it properly could result in sash cords breaking, excessive wear on the glazing bars and degradation of the paint and putty. The removal of sashes could also result in structural movements within the frame, which can cause the sash to not close properly. windows cambridge www.repairmywindowsanddoors.co.uk is also possible for the sash be stuck or fixed in an open position and let water and draughts enter the property.

Damage to windows made of timber is usually caused by moisture entry. This can be avoided with regular maintenance by thorough painting and eliminating the cause of dampness. The paint can be removed to reveal the soft, rotting wood. Any timber that is rotting must be removed and the affected area carefully cut or pieced with replacements made from the same type of timber as the ones remaining. This repair method increases the amount of fabric that was originally used and is one of most minimally invasive methods of treating the rot that occurs between timber and timber.

A resin-based wood condenser is a viable alternative to traditional sanding or staining. It is brushed onto the surface of the wood to protect it and stabilize it. It is particularly useful for the treatment of sash and pulley cords, which can help prevent breakage.

It is crucial to restore and not replace any historic ironmongery, such as stay latches and sash latches. These items can be very difficult to replace without harming the the original design. It is recommended that the use of modern aluminium fittings such as sash lifts and chain stays is avoided whenever possible as they can cause corrosion and deterioration of frames and sashes made of timber.