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How to Restore Timber Sash Windows in Cambridge

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

windows cambridge were previously operated by chains or cotton cords as well as weights made of lead. Modern sash windows feature hidden springs to address this issue.

1. Aesthetics

Unlike PVC-u windows that are constructed to modular imperial sizes Timber sash windows can be restored to their original sizes. This allows for the restoration of timber sash windows in order to comply with current energy standards and comply with conservation regulations for areas. It also provides windows that have a superior appearance than the uPVC alternatives.

Sliding windows with sash were initially intended for large structures or public buildings. However this changed as production became cheaper and artisans could make larger frames using more glass. By the end of the 18th century, sash windows were the most popular wooden design in British homes. As they were easy to open sash windows allowed light into rooms without curtains.

The first windows were made of glass that was plain However, in the 17th century, sash windows began to be more decorative. They started with coloured glazing bars, also known as mullions. They were expensive initially, but when glass production became less expensive and more efficient, they became a common feature in many period houses.

In the 19th century, it was possible to produce large, strong glasses that didn't need supporting bars. This allowed the frame size to increase further and this in turn meant more of a view from the window. This was a significant improvement.

Another important improvement was the introduction of the double-hung sliding window at the end of the I920s and beginning of the I930s. The double-hung sliding sash is another significant improvement that came about at the end of the I920s and beginning of the I930s.

Oak was used for older and more luxurious buildings. It is crucial to maintain the separation bead that is used to separate the sashes. This will help prevent draughts and rattles. It is also important that the idler and sash pulley wheels are kept in good condition as these assist in operating the window.

2. Energy efficiency

Sash windows were replaced by hinged casements as clearer and larger sheets became available. They were coated with plate glass that was set in timber frames with rebates and then pinned with glazing sprigs, and then putty on both sides to make them watertight. This kind of glazing gradually replaced the use of leaded lights.

The introduction of sashes led to a need for a much wider range of ironmongery, with the most basic fittings being brass pulleys as well as lead (and later cast iron) weights, sash stops shutter hinges, knobs and shutters, and a range of fasteners that secured the sashes into place. They were often decorated with motifs, inscriptions, and engravings that identified the maker.

Sash windows are energy efficient when they are maintained regularly. However, without this maintenance they may become drafty and let in cold air. Putty and paint can cause draughts too. This issue can be fixed with wood-to-timber products.

The replacement window industry 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, repairs to these windows can be costly and cause substantial disruption to the home. Many homeowners opt to replace their windows with PVC-u from a huge "one-stop shop" installation company. They can replace all windows in a home in one day, saving time and eliminating the need for different tradesmen to coordinate. They can also be fitted with energy-saving double-glazing to achieve higher energy efficiency ratings than are possible with traditional sash windows. These double-glazed windows aren't able to replicate the proportions or section of the sashes made of timber from the past.

3. Security

Traditional windows can be made secure without compromising their aesthetics. A variety of ironmongery types are available, including sash chains, mortice bolts and locks for sash. They can be fitted in such a way that the window is able to be opened to allow ventilation and cleaning. These products are often not noticeable since they are designed to be used in conjunction with sash windows. They can be used alongside traditional sash-window catches that must be replaced by more robust versions (such ones with double screws) or sprung levers to reduce 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 glazing bars have survived, they should be kept and if it is it is possible, the timber of the cill should be replaced with identical wood. Many PVC-U firms offer a one-stop installation service. They can take down and replace windows throughout a house in just one day, without the need to involve other tradespeople.

4. Ventilation

When sash windows were first introduced in the 17th century they allowed a significant amount of light into buildings. By the end of the 18th century, they were modified to let more light into rooms, and larger glass panes began to be manufactured. The result was a more streamlined appearance, and windows with a greater quality of design than before.

The introduction of sash windows also demanded the creation of a new line of ironmongery. Early pulleys could be made out of wood. Later Victorian ones were made of brass or a combination of wood and lead. There were also different types of knobs and shutter hinges. These ironmongery elements should always be kept and cleaned so that the fine quality of their design can be appreciated.

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

Sashes that do not slide smoothly.

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

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

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

The window replacement industry has done a lot to persuade house owners that their windows are old, dirty, and beyond economic repair. However, many older windows made of timber are in good condition and with minor repairs can easily be maintained for years to come.

5. Maintenance

The traditional sash windows require regular maintenance and inspection. Inability to keep up with this could result in the sash cords breaking, a lot of 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, causing the sash not to close correctly. It is also possible for the sash be stuck or slammed into an open position, which can let water and draughts in 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. The paint can be removed to reveal the soft, decaying wood. Any rotten sections of timber should be cut out and the affected area should be carefully wrapped or pieced back using replacements made from the same kind of timber as the ones remaining. This method of repair maximises the amount of original fabric that is left and is one of the least invasive methods of treating timber-to-timber decay.

The use of a resin-based wood consolidant is a different option to traditional sanding and staining. The product is brushed on the surface of the wood to protect it and stabilise it. It is particularly beneficial for the treatment of pulleys and sash cords where it can help to prevent the breakage.





It is important to restore and not replace any old ironmongery such as the sash latches and stays. These items can be very difficult to replace without damaging the quality of the original design. It is recommended that the use of modern aluminum fittings, such as chain stays and sash lifts is avoided if at all possible as they can cause corrosion and damage to timber frames and sashes.