This Is The Advanced Guide To Sash Windows Cambridge 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. However, sash windows may become stuck and difficult to open or close. This is usually due to moisture, which can cause the timber to swell.

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

1. Aesthetics

Timber sash windows, unlike PVC-u windows which are manufactured in imperial sizes and are modular, can be reconstructed to their original dimensions. This allows the restoration to meet the current energy standards while ensuring compliance with conservation area regulations. It also comes with a window that is far superior to uPVC alternatives.

Sliding windows with sash were initially intended for large structures or public buildings. However this changed as production became more affordable and artisans could produce larger frames with greater glass. In the late 18th century windows made of sash were the predominant wooden style in a majority of British homes. Since they were easy to open, sash windows let light into rooms without curtains.

The early windows were made of clear glass however, in the 17th century sash windows started to be more decorative. They started with coloured glazing bars, also known as mullions. They were expensive at first, but as glass production became less expensive and more efficient, they became a common feature in many historic homes.

In the 19th century, it was possible to make large, sturdy glasses that didn't require supporting bars. This allowed the frame to be made larger, which in turn gave a better view. This was a very important innovation.

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

The most commonly used kind of sash is made from slow grown deal (pine) however oak was utilized in more expensive buildings as well as in earlier examples. A parting bead is used to separate the two sashes and it is vital that it is maintained to prevent rattles and drafts. The idler wheels, sash pulleys and sash rollers are essential for the proper operation of the window.

2. Energy efficiency

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

The introduction of sashes led to a need for a much greater variety of ironmongery, with the most basic fittings being brass pulleys and lead (and later cast iron) weights, sash stoppers, shutter hinges and knobs as well as a range of fasteners to hold 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 extremely energy-efficient with regular maintenance. If they are not maintained they could become drafty. Draughts can also be caused by the breakdown of putty and paint. This can be remedied by making use of wood-to-timber repair tools that are proprietary.

The industry of replacement windows relies heavily on the perception that old windows are beyond repair and cannot be maintained economically. However windows can be easily maintained with a little attention. Repairs can be expensive and cause many disruptions in the home. To avoid this homeowners often prefer to replace their windows with PVC-u windows from one the largest "one-stop shop" installation companies. They can replace all windows in a home in one day, saving time and avoiding the need for different tradesmen to coordinate. They can also be supplied with 'energy saving' double-glazing, which can achieve more energy efficient ratings than traditional windows with sash. However, these double-glazed units cannot replicate the section and proportions of historic timber sashes.

3. Security

It is possible to secure traditional windows without compromising on their aesthetics. There are double glazed door repairs Repair My Windows And Doors of ironmongery that can be installed with sash chains, mortice bolts and sash locks. They can be fitted in a manner that the window can still be opened to allow ventilation and cleaning. These products are usually not noticeable, since they are designed to match the sash window. They can be used in conjunction with traditional sash window catch. They should be replaced by more robust models, such as ones that have double screws or spring levers to decrease the risk of being hit with hammers.

Sash-window frames were made from slow-growing deal or, in the more luxurious homes they were made from oak. Where glazing bars have survived they should be kept and if it is it is possible, the timber of the cill should be replaced by the same wood. Many PVC-U companies provide a one-stop shop installation service. They can take out and replace windows on a complete home in one day, without the need to involve other tradespeople.

4. Ventilation


When sash windows were first introduced in the 17th century they allowed a substantial amount of light into the buildings. By the end of the 18th century they were modified to let more light into rooms and larger glazing panes began to be manufactured. The result was a much lighter appearance and windows with a higher degree of elegance than before.

The introduction of sash windows also necessitated an entirely new range of ironmongery. Early pulleys could be made of wood. Later Victorian ones were made of brass or a combination of leaded and wood. There were also different types of shutter hinges and knobs. These ironmongery pieces must be kept clean and preserved in order to appreciate their fine design.

To ensure they remain in good shape, timber windows need to be maintained. Lack of regular attention may cause:

Sashes that no longer slide smoothly.

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

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

In the I920s and I930s steel casement windows gained popularity because they were strong, slim and cheap and were in line with the trend for healthy living. Research has proven that softwood sash window are just as effective as PVC-u windows and can even be more attractive.

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

5. Maintenance

The traditional sash windows need regular maintenance and inspection. If you don't maintain your sash window, it could cause the sash cords breaking, and the glazing bars deteriorating excessively. It can also cause paint and putty become damaged. The removal of sashes may also result in structural movements within the frame, causing the sash not to close correctly. It is also possible for the sash to be stuck or slammed into an open position, which can let water and draughts enter the property.

Damage to timber windows is often caused by moisture infiltration. This can be prevented with thorough painting, regular repairs and elimination of the cause of dampness. Wet rot is recognisable by the wavy appearance of the paint that can be stripped to reveal rotting, soft timber. Any rotten sections of timber should be cut out and the affected area carefully scarfed or pieced in using replacements made from the same kind of timber as those remaining. This method of repair increases the amount of original fabric retained and is among the least invasive methods for treating timber-to-timber decay.

The use of a wood consolidant made from resin is an alternative to traditional staining and sanding. The product is brushed on the surface of the wood to protect it and stabilize it. It is especially useful for the treatment of sash and pulley cords, where it can prevent breakage.

It is crucial that any ironmongery from the past like sash stays and latches are retained and restored instead of replaced. These items can be very difficult to replace without damaging the quality of the original design. It is also recommended that the use of modern aluminum fittings such as sash lifts and chain stays is avoided whenever possible since they can cause corrosion and deterioration of frames and sashes made of timber.