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Five Killer Quora Answers On 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 their appearance. However, sash windows can become stuck and difficult to open or close. This is usually due to moisture which can cause the timber to swell.

Box sash windows were previously operated with chains or cotton cords, as well as weights made of lead. Modern window springs for sash windows are concealed to eliminate this issue.

1. Aesthetics

Timber sash windows, in contrast to PVC-u windows which are manufactured in imperial sizes, which are modular, can be restored to their original size. This allows the restoration to meet the current energy standards while complying with conservation area regulations. It also offers a window with a far superior appearance than the 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 greater glass. By replacement windows cambridge repairmywindowsanddoors were the most popular wooden design in most British properties. Sash windows were simple to operate and let light in rooms without the need for curtains.

The first windows were made of plain glass, but by the 17th century, sash windows were becoming more decorative with coloured glazing bars and moulded mullions. These were very expensive at the time but as glass production became more efficient and less expensive, they were a common feature in numerous period houses.

In the 19th century, it became possible to produce large, strong glasses that didn't require supporting bars. This allowed the frame to be enlarged and, in turn, gave a better view. This was a significant advancement.

The introduction of the double-hung sliding sash is another significant improvement that came about towards the end of the I920s and at the beginning of the I930s. This allowed both the upper and lower sash to be opened simultaneously and gave improved ventilation to the building.

The most common kind of sash is made from slow grown deal (pine) but oak was utilized in more prestigious buildings and in earlier examples. It is crucial to maintain the parting bead that divides the sashes. This will stop rattles and draughts. It is also important that the idler and sash pulley wheels are in good shape as they help to operate the window.

2. Energy efficiency

Sash windows replaced hinged cases as clearer and larger sheets were made available. They were made of plate glass, set within rebated timber frames and then pinned with glazing sprigs, with putty on both sides to make them watertight. This type of glazing gradually replaced the leaded light bulbs.

The introduction of sashes resulted in the need for a greater variety of ironmongery, with the basic fittings being brass pulleys, lead (and later cast iron) weights, sash stops shutter hinges and knobs as well as a range of fasteners that secured the sashes into place. These were often decorated with motifs, inscriptions, and engraved patterns that identified the maker.

Sash windows can be very energy efficient if they are maintained regularly. However, without this maintenance they can become draughty and let in cold air. Draughts can also be caused by the breakdown of putty and paint. This can be remedied by making use of wood-to-timber repair tools that are proprietary.

The market for replacement windows rests on the perception that traditional windows are rotten and beyond repair, while they can be maintained with a little attention. However, repairs to these windows can be costly and cause considerable disruption to the home. Many homeowners decide to replace their windows using PVC-u from a large 'one-stop shop' installation company. They can replace all windows in a home in one day, saving time and avoiding the need for multiple tradesmen to coordinate. These windows can be fitted with energy-saving' double glazing to achieve more energy efficient ratings than a traditional sash window. However double-glazed windows cannot duplicate the proportions and section of the sashes made of timber from the past.

3. Security

Traditional windows can be secured without compromising their style. There are many types of ironmongery that can be installed, including sash chains, mortice bolts and locks for sash. They can be fitted so that the window is still capable of being opened to allow ventilation or for cleaning. They are generally not noticeable, since they are designed to match the sash window. They can be used in conjunction with traditional sash-window catchers that are required to be replaced with more robust models (such ones that have double screws) or sprung levers to reduce the risk of them being hammered out.

Sash-window frames were typically constructed from slow grown deal or, in more elegant homes they were made from oak. If the glazing bars are still in good condition, they should be retained. Where possible, the timber cills should be replaced with timber that is compatible with. Many PVC-U companies offer a one-stop installation service. They can remove and replace windows on an entire home in a single day, without the need to involve other tradespeople.

4. Ventilation

Sash windows were first introduced in the 17th century and allowed for a large amount of light into buildings. By the end of the 18th century they were adapted to allow more light into rooms, and bigger glazing panes started to be manufactured. The result was a more light appearance and windows that were more elegant.

The introduction of sash windows also demanded a new range of ironmongery. Early pulleys were of wood, while later Victorian ones were made of brass or a combination of lead and wood, and there were various types of shutter hinges and knobs. The ironmongery components should be maintained and cleaned to ensure that the exquisite quality of their design can be appreciated.

To ensure they remain in good shape, timber windows must be maintained. Inattention to maintenance routinely could lead to:

Sashes that don't slide easily.

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

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

In the I920s and the I930s steel casement windows increased in popularity due to their strength, slim and cheap, and complemented the vogue for healthy living. Studies have shown that softwood sash windows are as efficient as PVC-u windows, and may even be more attractive.

The replacement window industry has made a significant effort to convince homeowners that their old windows are rotten, draughty and beyond repair. Many old windows made of timber can be fixed and used for many more years with minor repairs.

5. Maintenance

A traditional sash window needs regular maintenance and inspection. If you don't maintain your sash window, it could result in the sash cords breaking and the glazing bars wearing out excessively. It can also cause paint and putty deteriorate. The removal of sashes may also cause structural movement 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 the water and drafts to enter the building.


Moisture penetration is a frequent cause of damage to timber windows. This can be prevented by regular repairs by thorough painting and eliminating the cause of dampness. The paint can be removed to reveal the soft, decaying wood. Any timber that is rotting must be removed and the affected area should be carefully cut or pieced with replacements made of the same type of timber as those remaining. This method of repair increases the amount of original fabric that is left and is among the least invasive methods of treating decay caused by timber.

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 particularly useful in the treatment of sash cords and pulleys which can help prevent the breakage.

It is important that any ironmongery from the past like sash stays and latches be kept 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 recommended that the use of modern aluminum fittings like sash lifts and chain stays should be avoided if feasible as they could cause corrosion and deterioration to frames and sashes made of timber.