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20 Tips To Help You Be Better At Sash Windows Cambridge
How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge feature traditional sash window and the homeowners are proud of their appearance. 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 expand.

Traditionally, window boxes used chains or cotton cords and weights made of lead to operate. Modern window springs for sash windows are concealed to avoid this issue.

1. Aesthetics

Contrary to PVC-u windows which are manufactured according to the modular imperial size the timber sash windows are able to be restored to their original dimensions. This allows the restoration of timber sash windows to meet current energy requirements and conform to conservation regulations for areas. It also offers windows that are superior to uPVC options.

Sliding sash windows were initially only found in large buildings or public buildings, but this changed as production became less expensive and craftsmen could create larger frames using more glass. In the late 18th century windows made of sash were the predominant design of wood in the majority of British properties. As they were easy to open, sash windows let light into rooms without the need for curtains.

The first windows were made of clear glass, but by the 17th Century the sash windows began to be more decorative. They were initially made of colored glazing bars, also known as mullions. They were expensive at the time but as glass production became more efficient and less expensive, they became a part of many period houses.

By the 19th century it was possible to make large, strong glass that didn't require supporting bars. This allowed the frame to be made larger which, in turn, provided an improved view. This was an important advancement.

The introduction of the double-hung sliding sash is another important improvement that occurred towards the end of the I920s and the beginning of the I930s. The double-hung sliding sash is another important improvement that came into existence at the end of the I920s and beginning of the I930s.

Oak was used in older examples and more prestigious buildings. It is essential to keep the parting bead that divides the sashes. This will prevent rattles and draughts. The sash pulleys, idler wheels and sash rollers also are crucial to the functioning of the window.

2. Energy efficiency

Sash windows replaced hinged cases as clearer and larger sheets were made available. Plate glass was set into frames of timber that were rebated, then secured with glazing sprigs and putty was then sprayed onto the frame's sides for watertightness. This kind of glazing gradually replaced leaded lights.

Sashes were introduced, which resulted in a greater demand for ironmongery. The most common fittings included brass pulleys (and later cast-iron) weights and stoppers for sashes shutter hinges and handles as well as a variety of fasteners used to secure the sashes. These were often decorated in patterns, inscriptions and engraved patterns to identify the maker.

Sash windows are energy efficient when they are maintained regularly. If they are not maintained they could become drafty. Draughts can also be caused by the deterioration of paint and putty. This can be fixed by making use of wood-to-timber repair tools that are proprietary.

The industry of replacement windows is based on the belief that traditional windows are rotten and beyond repair, but they can be easily maintained with just a little care. However, window seal repairs can be costly and cause substantial 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 replace all windows in a home in one day, thereby saving time and eliminating the need for multiple tradesmen to coordinate. They can also be fitted with 'energy saving' double-glazing to achieve higher energy efficiency ratings than traditional windows made of sash. However double-glazed windows cannot replicate the section and proportions of historic timber sashes.

3. Security

It is possible to secure traditional windows without compromising their appearance. A variety of ironmongery types can be installed with sash chains, mortice bolts and locks for sash. They can be fitted in a manner that the window can still be opened to allow ventilation and cleaning. These products are often unobtrusive as they are designed to complement sash windows. They can be used in conjunction with traditional sash window catch. These should be replaced by more robust models like ones that have double screws or spring levers to decrease the possibility of being hit with hammers.

Sash-window frames were traditionally made from slow-growing deal or, in the more elegant homes, from oak. Where glazing bars have survived they should be kept, and if it is feasible, the wood of the cill should be replaced by identical wood. Many PVC-U companies offer a one-stop installation service. They can take out and replace windows on an entire home in a single day, without involving other tradespeople.

4. Ventilation

When sash windows first introduced in the 17th century they allowed a large amount of light into buildings. By the end 18th century, they had been modified so that more light could be let into the rooms. Larger glass panes were also made. The result was a lighter look and windows with more elegance.

The introduction of sash windows also required an entirely new range of ironmongery. Early pulleys were constructed from wood. Later Victorian ones were made of brass or a mixture of wood and leaded. There were also a variety of types of knobs and shutter hinges. These ironmongery elements should always be retained and cleaned down to ensure that the exquisite quality of their design can be appreciated.

To ensure they remain in good condition, wooden windows require regular maintenance. Inattention to maintenance could lead to:

Sashes that do not move effortlessly.


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

Water can penetrate the putty and cause decay to the frame or the cill.

In the I920s and the I930s steel casement windows gained popularity due to their strength slim and inexpensive and were in line with the trend for healthy living. Research has shown that softwood sash window are just as efficient as PVC-u windows, and may even be more attractive.

The replacement window industry has done a lot to persuade house owners that their old windows are dirty, noisy and beyond economic repair. The reality is that many old windows made of wood are in good shape and with minor repairs could easily be maintained for years to be.

5. Maintenance

A traditional sash window needs regular maintenance and inspection. If you don't maintain your sash window, it can result in the sash cords breaking and the glazing bars wearing out excessively. It could also cause the paint and putty to deteriorate. The removal of the sashes could also result in structural movement within the frame which causes the sash to move out of alignment and in a position that it is not able to close properly. The sash could also get stuck in an open position, which allows water and draughts to enter the property.

The damage to timber windows is usually caused by moisture entry. This can be prevented by regular repairs as well as thorough painting, and then removing the cause of dampness. The paint can be removed to expose the soft, decaying wood. The sections that are rotting must be removed with care and the affected part should be scarfed together or pieced together with replacements of the exact type as the remaining timber. This method of repair maximizes the amount of fabric left, and is one of the least invasive methods of treating decay caused by timber.

A wood condenser that is based on resin is a viable alternative to traditional staining or sanding. It is brushed onto the surface of the wood to protect it and strengthen it. It is particularly useful in the treatment of pulleys and sash cords which can help prevent the breakage.

It is important that any ironmongery from the past such as sash stay and latches are retained and restored instead of replacing them. It is difficult to replace these items without altering their original design. It is also recommended that the use of modern aluminium fittings like chain stays and sash lifts should be avoided if possible as they can cause corrosion and deterioration of frames and sashes made of timber.