How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have sash windows that are traditional and homeowners are proud of the way they look. However, sash windows can become stuck and difficult to open or close. This is usually due moisture, which can cause the wood to expand.

Traditionally, window boxes utilised chains or cotton cords and weights made of lead to operate. Modern sash windows have hidden springs to overcome this issue.

1. Aesthetics

In contrast to PVC-u windows, which are constructed according to the modular imperial size Timber sash windows can be restored to their original size. This allows the restoration of timber sash windows in order to meet current energy requirements and conform to conservation area regulations. It also offers a window with a far superior appearance than uPVC alternatives.

Sliding windows with sash were initially only used for large buildings or public buildings. However this changed as production became more affordable 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. Sash windows were simple to operate and let light in rooms without the use of curtains.

The early 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 costly at first, but as glass production became cheaper and more efficient, they were a common feature in many historic homes.

In the 19th century, it was possible to create large, sturdy glass that did not need supporting bars. This allowed the frame size to be enlarged further, which allowed for a wider view out of the window. This was a significant innovation.

The introduction of the double glazing Seal repairs-hung sliding sash was a important improvement that occurred at the end of the I920s and beginning of the I930s. The double-hung sliding sash was another important improvement that was made at the end of the I920s and beginning of the I930s.

Oak was used for older and more luxurious buildings. A parting bead separates the two sashes. It is important that this is well maintained to prevent rattles and drafts. It is also essential that the idler and sash pulley wheels are in good shape as they assist in operating the window.

2. Energy efficiency

As larger and clearer sheets of glass were made available, sash windows began to replace hinged casements. They were coated with plate glass that was set in timber frames with rebates and then pinned with glazing sprigs, with putty on both sides to ensure they were watertight. This kind of glazing gradually superseded leaded lights.

Sashes were introduced, which resulted in increased demand for ironmongery. The basic fittings included brass pulleys (and later cast-iron) weights and stoppers for sashes shutter hinges, handles and shutter hinges, and various fasteners used to secure the sashes. They were often decorated with motifs, inscriptions or engraved patterns that identified the maker.

Sash windows can be very energy-efficient with regular maintenance. If they are not maintained they can get draughty. Draughts can also be caused by the breakdown of putty and paint. This can be corrected using wood-to-timber repair products that are specifically designed for this purpose.

The industry of replacement windows relies heavily on the perception that old windows are damaged beyond repair and cannot be maintained economically. However they can be maintained with a bit of attention. However, repairs to these windows are costly and can cause considerable disruption to the home. To avoid this, many homeowners choose to replace their windows with PVC-u windows from one of the large "one-stop shop" installation companies. These can remove and replace all the windows in a house in a single day, eliminating the need to coordinate multiple tradesmen and making the whole process much quicker. They are also available with energy-saving double-glazing to achieve greater energy efficiency than those offered by 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. Ironmongery like mortice bolts, sash chain, and sash lock can be installed. These can be installed in such a way that the window can still be opened to allow ventilation and cleaning. They are usually discrete since they are made to be used in conjunction with sash windows. They can be used with traditional sash window doctor catch. These are best replaced with more robust models, such as those with double screws or sprung levers in order to reduce the chance of being struck by hammers.

Sash-window frames were typically made from slow-growing deal or, in more elegant homes made of oak. If the glazing bars are still intact and are not damaged, they should be left. If it is possible, the timber cills should be replaced with wood that matches. Many PVC-U firms offer a one-stop installation service. They can remove and replace windows on an entire home in one day, without involving any other tradespeople.

4. Ventilation

When sash windows were first introduced in the 17th century they allowed a large amount of light to flood into structures. At the end of the 18th century, they had been adapted so that even more light could be let into rooms. Larger glass panes were also produced. The result was a lighter look and windows that were more elegant.

Sash windows were introduced that required a brand new type of ironmongery. The first pulleys were made of wood, later Victorian ones could be made from brass or a combination of wood and lead, and there were many kinds of shutter hinges and knobs. The ironmongery pieces need to be maintained and cleaned to appreciate their fine design.

Timber windows require careful maintenance to ensure they remain in good order. Lack of regular attention may lead to:

sashes that no longer slide smoothly.

holes in the frame allow water causing damage and decay.

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

In the I920s and I930s, steel casement windows increased in popularity because they were strong slim and inexpensive and were in line with the trend for healthy living. However, research has proven that traditional softwood sash windows can be just as efficient thermally as double-glazed PVC-u windows and may be more appealing than the sleek lines of modern casement windows.

The replacement window industry was able to convince homeowners that their old windows were decayed and drafty. They were also beyond the budget for repair. Many older timber windows can be fixed and used for many more years with minor repairs.

5. Maintenance

A traditional sash window requires regular maintenance and inspection. Inability to maintain it properly can result in broken sash cords, excessive wear on the glazing bars, and the deterioration of putty and paint. The removal of the sashes can also result in structural movement within the frame which causes the sash to be misaligned and unable to close correctly. It is also possible for the sash to be stuck or fixed in an open position, which can let water and draughts enter the property.

Damage to windows made of timber is often caused by moisture entry. This can be avoided by regular repairs by thorough painting and eliminating the cause of dampness. Wet rot is recognisable by the wavy look of the paint, which can be stripped to reveal soft, rotting wood. The sections of timber that are rotten must be removed with care, and the affected area should be snared together or glued together using replacements of the same nature as the rest of the timber. This method of repair maximises the amount of fabric retained and is one of the least invasive methods for treating timber-to-timber decay.

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

It is essential to preserve and not replace any historical ironmongery, like stay latches and sash latches. These items can be very difficult to replace without harming the the original design. It is recommended that the use of modern aluminium fittings, such as sash lifts and chain stays should be avoided if possible as they can cause corrosion and deterioration to timber frames and sashes.