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Does Technology Make Sash Windows Cambridge Better Or Worse?
How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have traditional sash windows and homeowners are proud of the way they appear. However, sash windows may get stuck and be difficult to open or close. This is usually due to moisture that can cause the wood to swell.

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

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows that are made in imperial sizes, which are modular, can be restored to original dimensions. This lets the restoration meet modern day energy requirements while still complying with conservation areas regulations. It also comes with an option that is superior to uPVC alternatives.

Sliding windows with sash were initially only used in large structures or public buildings, but the production process became less expensive and craftsmen could make larger frames with more glass. By the end of the 18th century, sash windows were the most popular wooden style in British homes. Since they were easy to open sash windows allowed light into rooms without curtains.

Early windows were simple glass, but in the 17th century sash windows started to become more decorative, with coloured glazing bars and moulded mullions. These windows were quite expensive at the time but as glass production improved and less expensive, they were a common feature in many period houses.

In the 19th century, it was possible to make large, strong glasses that did not require supporting bars. This allowed the frame's size to be increased even further, which gave a better view out of the window. This was a significant advancement.

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

The most popular type of sash is constructed from slow-growing deal (pine) however oak was also used in more expensive buildings as well as in earlier examples. A split bead divides the two sashes and it is essential that it is maintained in order to avoid rattles and drafts. The idler wheels, sash pulleys and sash rollers also are crucial to the operation of the window.

2. Energy efficiency

Sash windows replaced hinged casements as clearer and larger sheets were made available. Plate glass was placed in frames made of timber, which were which were pinned with glazing sprigs, and putty was applied to both sides of the frame for watertightness. This type of glass gradually replaced leaded lights.

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

Sash windows can be very energy-efficient with regular maintenance. However, without this maintenance they can become draughty and let in cold air. Draughts can also be caused by the deterioration of putty and paint. This can be corrected using wood-to-timber repair products that are specifically designed for this purpose.

The industry of replacement windows relies heavily on the notion that old windows are beyond repair and therefore cannot be maintained economically. However they can be maintained with a little attention. However, these repairs are costly and can cause considerable disruption to the home. To prevent this homeowners, many opt for a complete replacement with PVC-u windows from one of the largest 'one stop shop' installation companies. They can take down and replace all the windows in an entire house in a single day, eliminating the need to coordinate multiple tradesmen, making the whole process much more efficient. These windows can be fitted with 'energy-saving' double glazing to achieve higher energy ratings than the traditional sash window. These double-glazed units are not capable of replicating the proportions and sections of the sashes made of timber from the past.

3. Security

Traditional windows can be made secure without compromising their aesthetics. Ironmongery such as mortice bolts, sash chain and sash locks can be installed. These can be installed in a way so that the window can still be open for ventilation and cleaning. These products are often unobtrusive as they are designed to be used in conjunction with sash windows. They can be used alongside traditional sash-window catches, which must be replaced by more robust versions (such ones that have double screws) or spring-loaded levers to minimize the risk of them being hammered open.

Sash-window frames were constructed from slow grown deal or, in the more elegant homes they were made from oak. If the glazing bars are in good condition and in good condition, they should be kept. If it is it is possible, the cills of the timber should be replaced with wood that is in line with. PVC-u companies often provide a one-stop shop installation service, removing and replacing windows across a home in one 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 into the buildings. By the end 18th century, they were modified to allow more light could be let into the rooms. Larger glass panes were also produced. The result was a much more streamlined appearance, and windows with a higher degree of elegance than before.

The introduction of sash windows also demanded an entirely new range of ironmongery. Early pulleys were made from wood, 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. The ironmongery pieces need to be kept clean and preserved in order to appreciate their exquisite design.

To keep them in good shape, timber windows require regular maintenance. Lack of attention to them regularly could lead to:

Sashes that no longer slide smoothly.

Holes in the frame which allow water to get in and cause damage and decay.

break down of putty allowing water to penetrate, which could cause decay in the frame and cill.

In the I920s and I930s steel casement windows grew in popularity due to their durability slim and inexpensive and also matched the fashion for healthy living. However, research has shown that traditional softwood sash windows are just as thermally efficient as double-glazed PVC-u windows and may be more appealing than the sleek lines of modern casement windows.

The window replacement industry has done a great job convincing homeowners that their old windows were rotten, drafty and beyond economical repair. Many old windows made of timber can be fixed and used for a long time with minor repairs.

5. Maintenance

The traditional sash windows need regular maintenance and inspection. If you do not maintain your sash window, it can lead to the sash cords breaking, and the glazing bars deteriorating excessively. It can also cause paint and putty to become damaged. The removal of sashes could also cause structural movement in the frame, which can cause the sash not to close correctly. The sash can also be stuck in the open position, allowing the water and drafts to enter the building.

The damage to timber windows is often caused by moisture infiltration. This can be prevented by careful painting, regular repairs and the elimination of the cause of dampness. The paint can be removed to expose the soft, rotting wood. The sections that are rotting should be carefully removed and the affected area should be snared together or pieced together using replacements of the same nature as the rest of the timber. This repair method increases the amount original fabric and is one of least invasive ways to treat the rot that occurs between timber and timber.


A wood condenser that is based on resin is a viable alternative to traditional process of sanding or staining. The product is brushed on to the surface of the timber to help stabilize it and protect it from further damage. It is particularly useful in the treatment of sash cords and pulleys which help prevent the breakage.

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

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