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. Sash windows can become stuck and be difficult to open or shut. This is typically due to moisture which can cause the wood to swell.

Traditionally, windows made of box sash utilised chains or cotton cords and weights made of lead to operate. Modern sash windows have hidden springs to address this problem.

1. Aesthetics

In contrast to PVC-u windows, which are constructed to modular imperial sizes, timber sash windows can be restored to their original size. This permits the re-installation of timber sash windows in order to comply with current energy standards and comply with conservation regulations for areas. It also comes with a window that is far superior to the uPVC alternatives.

Sliding windows with sash were initially only found in large buildings or public buildings, however this changed when production was less expensive and craftsmen were able to create 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 into rooms without the use of curtains.

The first windows were made of plain glass However, by the 17th Century the sash windows began to become more attractive. They began with colored glazing bars, also known as mullions. They were expensive at first, but as glass production became less expensive and more efficient, they were commonplace in many period houses.

By the 19th century it was possible to create large, strong glass that didn't require supporting bars. This allowed the frame to be made larger and, in turn, gave the viewer a better view. This was a very important improvement.

Another significant 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 at the same time and allowed for better ventilation to buildings.

Oak was used in older examples and more prestigious buildings. A split bead divides the two sashes, and it is vital that it is well maintained to prevent rattles and draughts. The sash pulleys, idler wheels and sash rollers are also crucial to the functioning of the window seal repairs.

2. Energy efficiency

Sash windows cambridge (https://glamorouslengths.com/author/parcelracing65/) were replaced by hinged casements as clearer and larger sheets became available. Glass plates were set in frames of timber that were rebated, then secured with glazing sprigs and putty was applied to both sides of the frame for watertightness. This type of glass gradually replaced leaded lights.

The introduction of sashes created a need for a much wider range of ironmongery, with the most basic fittings being brass pulleys, lead (and later cast iron) weights, sash stops shutter hinges, knobs and shutters, and a range of fasteners used to keep the sashes into place. These were often decorated with motifs, inscriptions and engraved patterns that identified the maker.

Sash windows can be extremely energy efficient when they are maintained regularly. Without this maintenance, they can become draughty. Paint and putty can cause draughts too. This issue can be fixed by using wood-to-timber solutions.

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 bit of attention. Repairs can be expensive and cause lots of disruption to the home. To avoid this, many homeowners opt for a complete replacement with PVC-u windows made by one of the large "one-stop shop" installation companies. These can remove and replace all windows in a house in a single day, eliminating the need to coordinate different tradesmen and making the whole process much faster. They can also be supplied with 'energy-saving' double-glazing to get higher energy efficiency ratings than traditional windows made of sash. These double-glazed windows aren't able to replicate the proportions or section of historic timber sashes.

3. Security

Traditional windows can be secured without compromising their style. Ironmongery, such as mortice bolts, sash chain and sash lock could be used. They can be fitted in a way that the window is able to be opened for ventilation or for cleaning. These are typically minimal in appearance, as they are designed to match the sash window. They can be utilized in conjunction with traditional sash window maintenance catches that are required to be replaced with more robust versions (such as those incorporating double screws) or sprung levers to reduce the risk of them being opened by hammering.

Sash-window frames are traditionally constructed from oak or slow-grown deal. If the glazing bars are still in good condition and are not damaged, they should be left. If possible, the timber cills should be replaced with wood that matches. 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 involve other tradespeople, or coordinate visits from a number of different suppliers.

4. Ventilation

Sash windows were introduced in the 17th Century and allowed for a large amount of light to be absorbed into buildings. By the end 18th century, they had been modified so that more light could be let into the rooms. Larger glass panes were also made. The result was a lighter appearance, and windows that had a higher quality of design than before.

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

To ensure they remain in good condition, timber windows must be maintained. Lack of regular attention may lead to:

Sashes that do not slide smoothly.

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

break down of putty allowing water penetration that 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, and also because they were cheap and complemented the trend for healthy living. However, research has revealed that traditional softwood sash windows are as efficient thermally as PVC-u double-glazed windows, and may be more appealing than the modern sleek design of casement windows.

The window replacement industry was able to convince homeowners that their old windows were decayed and drafty. They were also beyond the budget for repair. The reality is that many older timber windows are in good condition and with minor repairs can easily be serviceable for many years to come.

5. Maintenance

A traditional sash window needs regular maintenance and inspection. If you fail to maintain your sash window, it can cause the sash cords breaking and the glazing bars deteriorating excessively. It can also cause the paint and putty to deteriorate. The removal of sashes can also result in structural shifts within the frame, which causes the sash to be misaligned and unable to close correctly. The sash could also get stuck in its open position, which allows water and draughts to enter the property.

Damage to timber windows is often caused by water infiltration. This can be prevented by thorough painting, periodic repairs and the elimination of the cause of dampness. The paint can be removed to expose the soft, decaying wood. Any rotten timber sections should be cut off and the affected part carefully wrapped or pieced back using replacements made of the same type of timber as the ones that remain. This method of repair maximises the amount of original fabric that is left and is one of the least invasive ways of treating decay caused by timber.

A wood condenser made of resin is a viable alternative to traditional process of sanding or staining. This is brushed onto the surface of the timber to stabilize it and protect it from further damage. It is particularly beneficial for the treatment of pulleys and sash cords which can help prevent breakage.

It is important to restore and not replace any old ironmongery such as stay latches and sash latches. They can be extremely difficult to replace without damaging the quality of the original design. It is also recommended that modern aluminium fittings like sashlifts and chainstays, be avoided as they could cause corrosion and deterioration of timber frames and sashes.