Indisputable Proof Of The Need For Sash Windows Cambridge How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have traditional sash windows and homeowners are proud of their appearance. Sash windows can become stuck and are difficult to open or shut. This is usually due to moisture, which can cause the wood to swell.

Traditionally, window boxes utilised chains or cotton cord and lead weights to operate. Modern sash windows have hidden springs to address this problem.

1. Aesthetics

Unlike PVC-u windows that are constructed according to imperial sizes that are modular, timber sash windows can be restored to their original sizes. sash window repair cambridge allows for the restoration of timber sash windows in order to meet the current energy requirements and to comply with conservation area regulations. It also offers a window with a far superior appearance than the uPVC alternatives.

Sliding frames for windows made of sash were originally only used in large buildings or public buildings. However, this changed when production became cheaper and artisans could make larger frames using larger glass. By the end of the 18th century, sash windows were the most sought-after wooden style in British homes. Sash windows were easy to operate and allowed light to enter rooms without the need for curtains.

The first windows were made of clear glass, but in the 17th century, sash windows began to become more ornamental. They began with colored glazing bars or mullions. These were very expensive at the time, but as glass production improved and cost-effective, they became a part of many of the period homes.

In the 19th century, it became possible to create large, strong glasses that did not require supporting bars. This allowed the frame size to increase further and this in turn gave a better view out of the window. This was an important innovation.

Another important improvement was the introduction of the double-hung sliding window at the end of I920s and at the beginning of I930s. This allowed both the upper and lower sash to be opened at the same time and also improved the ventilation of a building.

Oak was used in older examples and for more prestigious buildings. A split bead divides the two sashes. It is essential that it is maintained to prevent rattles and drafts. It is also essential that sash pulleys and idler wheels are kept in good condition as these aid in operating the window.

2. Energy efficiency

As larger and clearer sheets of glass were made available, sash windows began replacing hinged casements. They were made of plate glass, set within rebated timber frames and secured with glazing sprigs and putty on both sides to make them watertight. This kind of glazing gradually superseded the leaded light bulbs.

The introduction of sashes led to the need for a wider range 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 used to keep the sashes into the right place. They were often decorated with designs, inscriptions, and engravings to identify the maker.

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

The industry of replacement windows relies heavily on the notion that old windows are damaged beyond repair and are not able to be maintained economically. However they can be maintained with a bit of attention. Repairs can be costly and cause a lot of disruption in the home. Many homeowners decide to replace their windows using PVC-u from a 'one-stop shop' installation company. These can remove and replace all windows in a home in just one day, eliminating the need to coordinate different tradesmen, making the whole process much quicker. They can also be supplied with 'energy-saving' double-glazing to get higher energy efficiency ratings than are possible with traditional sash windows. Double-glazed windows aren't capable of replicating the proportions and sections of historic timber sashes.

3. Security

Traditional windows can be secured without compromising their aesthetics. Ironmongery, such as sash chain, mortice bolts, and sash lock can be used. These can be put in place in a way that the window is still capable of being opened for ventilation or for cleaning. These products are usually unobtrusive, as they are designed to complement the sash window. They can be used alongside traditional sash-window catchers that must be replaced by more robust models (such ones that have double screws) or spring levers to decrease the chance of them being hammered open.

Sash-window frames are usually made of oak or slow-grown deal. If the glazing bars are still intact and in good condition, they should be kept. Where feasible, the cills made of timber should be replaced with wood that matches. Many PVC-u firms offer a one-stop installation service. They can remove and replace windows on a complete home in a single day, without involving other tradespeople.

4. Ventilation

Sash windows were introduced in the 17th Century and allowed for a large amount of light to enter buildings. By the end of the 18th century they were adapted to allow even more light into rooms, and larger glass panes began to be made. The result was a lighter appearance, and windows with a greater degree of elegance than before.

Sash windows were introduced, which required a new range ironmongery. Early pulleys were constructed out of wood. Later Victorian ones were made of brass or a mixture of wood and lead. There were also a variety of types of knobs and shutter hinges. The ironmongery pieces need to be cleaned and preserved to appreciate their fine design.

Timber windows require careful maintenance to keep them in good order. Inattention to maintenance routinely could lead to:

Sashes that no longer slide smoothly.

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

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

Steel casement windows were popular in the I920s and I930s because they were sturdy and slim, cost-effective and matched the trend of healthy living. Research has shown that softwood sash window are just as effective as PVC-u windows, and may even be more attractive.

The replacement window industry has done a lot to persuade house owners that their traditional windows are old, dirty, and beyond repair. Many old windows made of timber can be repaired and used for a long time with minor repairs.

5. Maintenance

The traditional sash windows require regular maintenance and inspection. If you fail to maintain your window's sash, it could lead to the sash cords breaking, and the glazing bars deteriorating excessively. It could also cause paint and putty to degrade. The removal of sashes could also cause structural movement in the frame, which can cause the sash to not close correctly. The sash can also be stuck in its open position, allowing water and draughts into the building.

Moisture penetration is the most common cause of damage to windows made of timber. This can be avoided with regular repairs, thorough painting and removing the cause of dampness. The paint can be removed to expose the soft, rotting wood. Any rotten sections of timber should be cut out and the affected area should be carefully scarfed or pieced in using replacements made of the same type of wood as the ones remaining. This repair method increases the amount of fabric used in the first place and is among the most non-invasive methods to treat the rot that occurs between timber and timber.

A wood condenser that is based on resin is an alternative to traditional staining or sanding. This is brushed onto the surface of the timber to stabilise and shield it from further damage. It is especially useful for the treatment of pulley cords and sash, which can stop breakage.


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