10 Top Mobile Apps For Sash Windows Cambridge How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have sash windows with traditional designs and homeowners are proud of the way they appear. Sash windows can become stuck and become difficult to open and close. This is often due to moisture, which can cause the timber to swell.

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

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows which are manufactured in imperial sizes and are modular, are able to be restored to original dimensions. This allows for the restoration of timber sash windows in order to meet current energy requirements and conform to conservation regulations for areas. It also gives windows with a superior appearance than uPVC alternatives.

Sliding sash window frames were initially only used in large buildings or public buildings. However, this changed when production became cheaper and artisans could produce larger frames with more glass. By the end of the 18th century, sash windows had become the most popular wooden style in British homes. Since they were easy to open sash windows allowed light into rooms without the need for curtains.

Early windows were simple glass but by the 17th century, sash windows were becoming more decorative with coloured glazing bars and moulded mullions. They were costly at the beginning but when glass production became less expensive and more efficient, they were a common feature in many period houses.

In the 19th century, it was possible to make large, sturdy glasses that didn't need supporting bars. This allowed the frame to be enlarged, which in turn gave the viewer a better view. This was a significant innovation.

Another important improvement was the introduction of the double-hung sliding window at the end of the I920s and beginning of I930s. This allowed both the lower and upper sash to be opened simultaneously and gave improved ventilation to buildings.

The most commonly used type of sash is constructed from slow-growing deal (pine) but oak was also used in more expensive buildings as well as in earlier examples. A split bead divides the two sashes and it is vital that it is maintained to prevent rattles and draughts. windows cambridge , idler wheels and sash rollers are also essential for the proper operation of the window.

2. Energy efficiency

As clearer and larger sheets of glass became available, sash windows started replacing hinged casements. Glass plates were set in frames made of timber, which were secured with glazing sprigs and putty was applied to both sides of the frame to ensure watertightness. This type of glass gradually replaced the use of leaded lights.

The introduction of sashes created a need for a much greater variety of ironmongery, with the basic fittings being brass pulleys, lead (and later cast iron) weights, sash stoppers shutter hinges and knobs and a variety of fasteners that secured the sashes in the right place. These were usually decorated with patterns, inscriptions and engravings to identify the maker.

Sash windows can be extremely energy efficient if they are maintained regularly. However, if they are not maintained, they may become drafty and let in cold air. Paint and putty can also cause draughts. This can be fixed by using wood-to-timber repair products that are specifically designed for this purpose.

The replacement window industry relies on the assumption that old windows are damaged and beyond repair, whereas they can be easily maintained with a little attention. These repairs can be expensive and cause many disruptions in the home. Many homeowners opt to replace their windows with PVC-u from a large 'one-stop shop' installation company. They can replace all windows in a house in one day, thereby saving time and avoiding the need for different tradesmen to coordinate. They can also be supplied with 'energy-saving' double-glazing to get more energy efficient ratings than those offered by traditional sash windows. However double-glazed windows cannot replicate the section and proportions of historic timber sashes.

3. Security

It is possible to secure windows that are traditional without compromising their style. Ironmongery, such as sash chain, mortice bolts, and sash lock can be installed. These can be installed in such a way that the window can be open for ventilation and cleaning. They are generally not noticeable, since they are designed to match the sash window. They can be used alongside traditional sash-window catchers that are required to be replaced with more robust versions (such ones with double screws) or spring-loaded levers to minimize the possibility of them being hammered open.

Sash-window frames are typically made from oak or slow-grown deal. 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 the same wood. PVC-u companies often provide a one-stop shop installation service, removing and replacing windows across a home in a single day without the need to engage other tradespeople or coordinate visits from different suppliers.

4. Ventilation

When sash windows were first introduced in the 17th century, they allowed a substantial amount of light to flood into buildings. At the end of the 18th century, they were modified so that more light could be let into rooms. Larger glazing panes were also created. The result was a lighter appearance and windows that were more elegant.


The introduction of sash windows also required a new range of ironmongery. Early pulleys were of wood, later Victorian ones were made from brass or a combination of lead and wood and there were various types of shutter hinges and knobs. The ironmongery pieces need to be cleaned and preserved to appreciate their exquisite design.

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

Sashes that do not slide easily.

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

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

In the I920s and I930s, steel casement windows increased in popularity due to their strength slim and inexpensive, and complemented the vogue for healthy living. However, research has proven that traditional softwood sash windows are as efficient in thermal efficiency as double-glazed windows made of PVC-u, and can be more attractive than the sleek lines of modern casement windows.

The industry of replacement windows has done a great job convincing homeowners that their old windows were rotten drafty, noisy and beyond repair. Many old windows made of timber can be repaired and utilized for a longer period with minor repairs.

5. Maintenance

The traditional sash windows require regular maintenance and inspection. Inability to keep up with this can lead to the sash cords breaking, a lot of wear on the glazing bars and deterioration of paint and putty. The removal of sashes may also cause structural movement within the frame which causes the sash to become misaligned and not closing properly. It is also possible for the sash be stuck or fixed in an open position and let water and draughts into the structure.

Moisture penetration is a frequent cause of damage to windows made of timber. This can be prevented by thorough painting, regular repairs, and removing the source of dampness. Wet rot is recognisable by the wavy look of the paint, which can be stripped to reveal soft, rotting wood. The sections that are rotting must be removed with care and the affected part should be scarfed or pieced together by using replacements of the same nature as the rest of the timber. This method of repair increases the amount of original fabric retained and is one of the least invasive ways of treating decay caused by timber.

The use of a wood consolidant made from resin is another alternative to traditional staining and sanding. This is brushed on the surface of the wood to protect it and strengthen it. It is especially beneficial for treating sash and pulley cords, where it can prevent breakage.

It is important that any historic ironmongery such as sash stay and latches are retained and rehabilitated instead of being replacing them. These items are difficult to replace without damaging the quality of the original design. It is also recommended that modern fittings made of aluminium like sashlifts, as well as chainstays, be avoided as they can cause deterioration and corrosion of timber frames and sashes.