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A Step-By-Step Instruction For Sash Windows Cambridge
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 may get stuck and be difficult to open or close. This is usually due to moisture, which can cause the timber to swell.

Box sash windows were historically operated by chains or cotton cords, as well as lead weights. Modern sash windows feature hidden springs to solve this problem.

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows which are manufactured in imperial sizes, which are modular, can be reconstructed to original dimensions. This allows the restoration to meet the current energy standards while complying with conservation areas regulations. It also gives windows with a superior appearance than the uPVC alternatives.

Sliding sash windows were originally only used in large buildings or public buildings, however the production process was less expensive and craftsmen were able to make larger frames with more glass. In the 18th century, Sash windows were the most popular wooden style in a majority of British homes. Since they were easy to open, sash windows let light into rooms without the need for curtains.

The early windows were made of glass that was plain, but by the 17th Century, sash windows began to be more decorative. They were initially made of colored glazing bars, also known as mullions. They were expensive at the time, but as glass production improved and less expensive, they were a common feature in many period houses.


In the 19th century it was possible to create large, sturdy glass that didn't require supporting bars. This allowed for the frame to be enlarged, which in turn gave a better view. This was a very important advancement.

The introduction of the double-hung sliding sash is another significant improvement that came about in the I920s and at the beginning of the I930s. The double-hung sliding sash was a important improvement that was made at the end of the I920s and at the beginning of the I930s.

The most common type of sash is made from slow-growing deal (pine) but oak was also used in more expensive buildings as well as in earlier examples. It is essential to keep the parting bead that separates the sashes. This will help prevent draughts and rattles. The idler wheels, sash pulleys and sash rollers are also crucial to the functioning of the window.

2. Energy efficiency

As larger and clearer glass sheets became available, sash window began replacing hinged casements. They were coated with plate glass that was set within rebated timber frames and pinned in place using glazing sprigs, with putty on both sides to ensure they were watertight. This kind of glazing gradually replaced the leaded light bulbs.

Sashes were introduced, which led to increased demand for ironmongery. The most common fittings included brass pulleys (and later cast-iron) weights and stoppers for sashes, shutter hinges and handles, and various fasteners used to fix the sashes. These were usually decorated with designs, inscriptions, and engravings to identify the maker.

Sash windows can be extremely energy efficient when they are maintained regularly. But, if you don't maintain them, they can become drafty and let in cold air. Draughts can also result from the degeneration of paint and putty. It is possible to fix this issue with wood-to-timber products.

The replacement window industry relies on the perception that older windows are old and beyond repair, whereas they can be easily maintained with a bit of care. These repairs can be costly and cause lots of disruption to the home. Many homeowners opt to replace their windows with PVC-u from a 'one-stop shop' installation company. These can remove and replace all the windows in an entire house in just one day, avoiding the need to coordinate multiple tradesmen, making the whole process much faster. These windows can be fitted with energy-saving double-glazing to attain higher energy ratings than traditional windows with sash. However double-glazed windows cannot duplicate the proportions and section of historic timber sashes.

3. Security

Traditional windows can be secured without compromising their style. Ironmongery like mortice bolts, sash chain, and sash lock can be used. These can be installed in such a way that the window can still be opened for ventilation and cleaning. These products are usually not noticeable, since they are designed to fit the sash window. They can be used in conjunction with traditional sash window catch. These are best replaced with more robust models like those that incorporate double screws or spring levers in order to reduce the possibility of being hammered.

Sash-window frames are typically made from oak or slow-grown deal. If the glazing bars are in good condition and are not damaged, they should be left. If feasible, the cills made of timber should be replaced by wood that matches. PVC-u companies often provide a one-stop shop installation service, which includes removing and replacing windows on an entire house in a day without the need to engage other tradespeople, or coordinate visits from a number of different suppliers.

4. Ventilation

When sash windows first introduced in the 17th century they allowed a significant amount of light to flood into the buildings. In the 18th century, they had been modified to allow more light could be let into rooms. Larger glass panes were also made. The result was a more light appearance and windows that were more elegant.

Sash windows were introduced, which required a new range ironmongery. cambridge windows and doors were made from wood. Later Victorian ones were made of brass or a mixture of leaded and wood. There were also different kinds of knobs and shutter hinges. These ironmongery pieces must be cleaned and preserved to appreciate their fine design.

To keep them in good condition, timber windows must be maintained. Lack of regular attention may lead to:

sashes that no longer slide smoothly.

holes in the frame allow water that can cause decay and damage.

break down of putty allowing water penetration that can lead to decay in the frame and cill.

Steel casement windows were popular in the I920s & I930s because they were strong and slim, and also because they were cheap and matched the trend of healthy living. Research has shown that softwood sash window are as efficient as PVC-u windows and can even be more attractive.

The industry of replacement windows has done a lot to convince homeowners that their traditional windows are rotten, draughty and beyond economic repair. Many older timber windows can be repaired and used for many more years with minor repairs.

5. Maintenance

A traditional sash window requires regular maintenance and inspection. If you do not maintain your window's sash, it could lead to the sash cords breaking, and the glazing bars deteriorating excessively. It could also cause the paint and putty to become damaged. The removal of sashes could also cause structural movement in the frame, which can cause the sash to not close correctly. It is also possible for the sash be snagged or slammed into an open position and let water and draughts enter the structure.

Damage to windows made of timber is often caused by moisture penetration. This can be prevented by regular maintenance by thorough painting and eliminating the cause of dampness. The paint can be removed to expose the soft, decaying wood. The rotten timber sections should be carefully cut out and the affected part should be scarfed together or glued together using replacements of the same nature as the rest of the timber. This method of repair increases the amount of original fabric left, and is among the least invasive methods of treating decay caused by timber.

A wood condenser that is based on resin is a viable alternative to traditional sanding or staining. This is brushed onto the surface of the timber to stabilise and protect it from further damage. It is particularly useful in the treatment of sash cords and pulleys where it can help to stop breakage.

It is essential that any ironmongery from the past such as sash stays and latches are kept and restored rather than replaced. These items can be very difficult to replace without compromising the quality of the original design. It is recommended that the use of modern aluminium fittings, such as chain stays and sash lifts is avoided if at all possible as they can cause corrosion and damage to frames and sashes made of timber.