Why We Love Sash Windows Cambridge (And You Should Also!) How to Restore Timber Sash Windows in Cambridge

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

Traditionally, box sash windows used chains or cotton cord and weights made of lead to operate. Modern sash windows have hidden springs to overcome this issue.

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows, which are made in imperial sizes that are modular, can be reconstructed to their original dimensions. This lets the restoration be in line with modern energy requirements while still complying with conservation areas regulations. It also provides windows that have a superior appearance than uPVC alternatives.

Sliding windows with sash were initially only found in large buildings or public buildings, however this changed as production became less expensive and craftsmen could make larger frames with more glass. In the late 18th century sash windows were the dominant wooden design in most British homes. Sash windows were simple to operate and let light in rooms without the need for curtains.

The first windows were made of plain glass, but in the 17th century, sash windows started to become more decorative, with coloured glazing bars and moulded mullions. They were expensive at the time but as glass production improved and less expensive, they became a feature of many of the period homes.

In the 19th century, it became possible to produce large, sturdy glasses that did not require supporting bars. This allowed the frame to be enlarged and, in turn, gave a better 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. The double-hung sliding sash was a important improvement that was made at the end of the I920s and at the beginning of the I930s.

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

2. Energy efficiency

Sash windows were replaced by hinged casements as larger and clearer sheets became available. Plate glass was set into frames of timber that were rebated, then pinned with glazing sprigs and putty was then sprayed onto the frame's two sides to ensure watertightness. This kind of glazing gradually superseded led lights.

Sashes were introduced, which led to a greater demand for ironmongery. The most basic fittings were brass pulleys (and later cast-iron) weights, sash stoppers, shutter hinges and handles and a variety of fasteners used to fix the sashes. They were often decorated with designs, inscriptions, and patterns engraved to identify the maker.

Sash windows can be very energy-efficient with regular maintenance. However, without this maintenance they can become drafty and let in cold air. Draughts can also be caused by the breakdown of putty and paint. You can fix this problem by using wood-to-timber products.

The industry of replacement windows relies heavily on the belief that older windows are beyond repair and therefore cannot be maintained economically. However they can be maintained with a bit of attention. Repairs can be costly and cause many disruptions in the home. Many homeowners opt to replace their windows using PVC-u from a large "one-stop shop" company for installation. They can replace all windows in a home in a single day, saving time and eliminating the need for multiple tradesmen to coordinate. These windows can be fitted with 'energy-saving' double glazing to achieve higher energy ratings than the 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 traditional windows without compromising on their aesthetics. A variety of ironmongery types are available with sash chains, mortice bolts, and sash locks. These can be put in place to ensure that the window is open to allow ventilation or for cleaning. These are typically not noticeable, since they are designed to fit the sash window. They can be used with traditional sash window catches. They should be replaced with more robust models, such as ones that have double screws or sprung levers, to minimize the chance of being struck by hammers.

Sash-window frames were typically constructed from slow grown deal or, in the more elegant homes, from oak. If the glazing bars remain intact and in good condition, they should be kept. If it is possible, the cills of the timber should be replaced by wood that is in line with. Many PVC-U companies offer a one-stop shop installation service. They can take out and replace windows throughout a home in one day, without involving other tradespeople.

4. Ventilation

Sash windows were introduced in the 17th century and allowed for a large amount of light to be absorbed into buildings. By the end 18th century, they were modified so that more light could be let into rooms. Larger glass panes were also created. The result was a much lighter appearance and windows that had a higher degree of elegance than before.

The introduction of sash windows also required the creation of a new line of ironmongery. The first pulleys were made of wood, whereas later Victorian ones could be made from brass or a combination of lead and wood and there were various types of shutter hinges and knobs. Ironmongery elements must be kept and cleaned so that the quality of their design can be appreciated.

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 allow water, which can cause damage and decay.

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

In the I920s and the I930s steel casement windows gained popularity due to their durability slim and inexpensive, and complemented the vogue for healthy living. Research has shown that softwood sash window are just as efficient as PVC-u windows and can even be more attractive.

The industry of replacement windows has done a great job convincing homeowners that their old windows were rotten and drafty. They were also beyond the budget for repair. Many old windows made of timber can be fixed and used for many more years with minor repairs.

5. Maintenance

The traditional sash windows need regular maintenance and inspection. If you do not maintain your sash window, it can cause the sash cords breaking and the glazing bars deteriorating excessively. It can also cause paint and putty to deteriorate. The removal of sashes may also result in structural movement within the frame, causing the sash not to close correctly. replacement windows cambridge could also get stuck in the open position, which allows water and draughts into the property.

Moisture penetration is a common cause of damage to windows made of timber. This can be avoided by thorough painting, periodic repairs and the elimination of the cause of dampness. Wet rot can be identified due to the wavy appearance of the paint, which can be stripped to reveal soft, rotting timber. Any timber that is rotting must be removed and the affected part carefully cut or pieced with replacements made from the same kind of timber as those remaining. This repair method increases the amount original fabric and is one of most non-invasive methods to treat wood-to-timber rot.

A wood condenser that is based on resin is an alternative to traditional staining or sanding. The product is brushed on the surface of the wood to protect it and stabilize it. It is particularly useful in the treatment of pulleys and sash cords where it can help to prevent breakage.


It is essential to preserve and not replace any old ironmongery, such as sash latches and stays. These items can be very difficult to replace without damaging the the original design. It is also advised that modern fittings made of aluminium like sashlifts and chainstays, should be avoided since they can cause deterioration and corrosion of timber frames and sashes.