This Is The Ultimate Guide To 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 get stuck and are difficult to open or close. This is usually due to moisture which can cause the wood to expand.

Traditionally, window boxes used chains or cotton cord and lead weights to operate. Modern sash windows have hidden springs to overcome this issue.

1. Aesthetics

In contrast to PVC-u windows, which are manufactured according to imperial sizes that are modular, timber sash windows can be restored to their original dimensions. This allows the restoration to meet modern day energy requirements while still complying with conservation area regulations. It also provides an option that is superior to uPVC alternatives.

Sliding sash window frames were initially intended for large structures or public buildings. However this changed as production became more affordable and artisans could make larger frames using larger glass. At the end of the 18th century, sash windows were the most sought-after wooden style in British homes. Because they were simple to open sash windows allowed light into rooms without the need for curtains.

Early windows were plain glass but by the 17th century sash windows started to become more attractive with coloured glass bars and moulded mullions. These were very expensive at the time but as glass production became more efficient and cheaper they became a part of numerous period houses.

In the 19th century it was possible to manufacture large, sturdy glass that did not require support bars. This allowed for the frame to be made bigger and, in turn, gave the viewer a better view. This was a significant advancement.

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

Oak was used for older and more luxurious buildings. A parting bead is used to separate the two sashes and it is vital that it is maintained to prevent rattles and drafts. It is also essential that the idler and sash pulley wheels are in good working order as they aid in operating the window.

2. Energy efficiency

As clearer and larger sheets of glass became available, sash window began to replace hinged casements. Plate glass was placed in rebated timber frames, pinned with glazing sprigs and putty was then sprayed onto both sides of the frame for watertightness. This type of glazing gradually replaced the leaded light bulbs.

upvc window renovation repairmywindowsanddoors.co.uk of sashes created an need for a wider range of ironmongery, with the basic fittings being brass pulleys as well as lead (and later cast iron) weights, sash stops shutter hinges and knobs, and a range of fasteners to hold the sashes in place. These were often decorated with motifs, inscriptions, and engraved patterns that identified the maker.

Sash windows are energy efficient if they are maintained regularly. However, without this maintenance they can become drafty and let in cold air. Paint and putty may cause draughts too. You can fix this problem with wood-to-timber products.

The market for replacement windows is based heavily on the notion that old windows are beyond repair and are not able to be maintained economically. However windows can be easily maintained with a bit of attention. Repairs can be costly and cause lots of disruption to the home. Many homeowners choose to replace their windows with PVC-u from a large "one-stop shop" company for installation. They can replace all windows in a home in one day, saving time and avoiding the need for various tradesmen to coordinate. They can also be fitted with energy-saving double-glazing, which can achieve higher energy efficiency ratings than those offered by traditional windows with sash. These double-glazed windows aren't capable of replicating the proportions and section of the sashes made of timber from the past.

3. Security

It is possible to secure traditional windows without compromising their style. Ironmongery, such as mortice bolts, sash chain, and sash lock can be used. These can be installed to ensure that the window remains capable of being opened for ventilation or for cleaning. These windows are typically not noticeable since they are designed to be used in conjunction with sash windows. They can be used alongside traditional sash window catches and are required to be replaced with more robust versions (such ones with double screws) or spring levers to decrease the risk of them being hammered out.

Sash-window frames are traditionally made from oak or slow-grown deal. If the glazing bars are still in good condition, they should be retained. If it is it is possible, the cills of the timber should be replaced by wood that matches. PVC-U companies usually offer a one stop shop installation service, which includes removing and replacing windows on an entire home in one day, without the need to involve other tradespeople or co-ordinate various visits from a number of different suppliers.

4. Ventilation

Sash windows were introduced in the 17th Century and allowed for a significant amount of light to be absorbed into buildings. In 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 with more elegance.

Sash windows were introduced that required a brand new range ironmongery. The first pulleys were made of wood, later Victorian ones were made from brass or a mixture of wood and lead, and there were various types of shutter hinges and knobs. These ironmongery elements should always be retained and cleaned down to ensure that the exquisite quality of their design can be appreciated.

Timber windows require regular maintenance to ensure they remain in good order. Inattention to maintenance routinely could lead to:

sashes that no longer slide smoothly.

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

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


In the I920s and I930s, steel casement windows increased in popularity due to their durability, slim and cheap, and complemented the vogue for healthy living. However, research has shown that traditional softwood sash windows are as efficient in thermal efficiency as double-glazed PVC-u windows and may be more appealing than the modern sleek design of casement windows.

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

5. Maintenance

A traditional sash window needs regular maintenance and inspection. Inability to maintain it properly can result in sash cords breaking, excessive wear on the glazing bars and the deterioration of putty and paint. The removal of sashes can also result in structural movement within the frame that causes the sash to move out of alignment and not closing properly. The sash could also get stuck in the open position, which allows the water and drafts to enter the property.

The damage to timber windows is often caused by moisture penetration. This can be avoided by careful painting, regular repairs and the elimination of the source of dampness. Wet rot can be identified due to the wavy appearance of the paint that can be removed to reveal soft, rotting timber. Any timber that is rotting must be removed and the affected area carefully cut or pieced with replacements made from the same type of wood as the ones remaining. This method of repair increases the amount of fabric left, and is among the least invasive methods of treating decay of timber to timber.

The use of a wood consolidant made from resin is a different option to the traditional method of staining and sanding. It is brushed on the surface of the wood to help stabilize it and protect it from further damage. It is especially useful to treat pulley cords and sash where it can prevent breakage.

It is essential to preserve and not replace any historic ironmongery, like stay latches and sash latches. These items can be very difficult to replace without damaging the the original design. It is also advised that modern fittings made of aluminium, such as sashlifts and chainstays, are avoided since they could cause corrosion and deterioration of timber frames and sashes.