A Step-By-Step Guide To Sash Windows Cambridge How to Restore Timber Sash Windows in Cambridge

Many homes in Cambridge have traditional sash windows and the homeowners are proud of their appearance. However, sash windows may get stuck and be difficult to open or close. This is often due moisture which can cause the timber to expand.

Traditionally, box sash windows utilized chains or cotton cords and lead weights to operate. Modern window springs for sash windows are concealed to solve this problem.

1. Aesthetics


In contrast to PVC-u windows, which are made according to the modular imperial size Timber sash windows can be restored to their original sizes. This allows the restoration to meet the current energy standards while ensuring compliance with conservation area regulations. It also offers an option that is superior to the uPVC options.

Sliding windows with sash were initially only used in large structures or public buildings, but this changed as production became less expensive and craftsmen could create larger frames using more glass. By the late 18th century Sash windows were the most popular wooden design in most British properties. As they were easy to open, sash windows let light into rooms without curtains.

The early windows were made of clear glass, but in the 17th century, sash windows began to be more decorative. They were initially made of colored glazing bars or mullions. They were costly initially, but as glass production became cheaper and more efficient, they were commonplace in many historic homes.

In the 19th century, it became possible to create large, strong glasses that did not require support bars. This allowed the frame's size to increase further and this in turn gave a better view from the window. This was an important innovation.

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

Oak was used for older and more luxurious buildings. It is essential to keep the parting bead that is used to separate the sashes. This will prevent draughts and rattles. It is also important that sash pulleys and idler wheels are in good condition as these assist in operating the window.

2. Energy efficiency

Sash windows replaced hinged casements as larger and clearer sheets were made available. Plate glass was set into frames of timber that were rebated, then which were pinned with glazing sprigs, and putty was then sprayed onto the frame's two sides for watertightness. This type of glazing gradually superseded led lights.

Sashes were introduced, which led to a greater demand for ironmongery. The basic fittings included brass pulleys (and later cast-iron) weights, sash stoppers shutter hinges and handles, and a variety of fasteners used to fix the sashes. These were often decorated with motifs, inscriptions or designs that were engraved to identify the maker.

With regular maintenance, sash windows can be very energy efficient. But, if you don't maintain them, they can become draughty and let in cold air. Draughts can also result from the degeneration of paint and putty. This can be remedied by using wood-to-timber repair products that are specifically designed for this purpose.

The replacement window industry relies on the belief that traditional windows are rotten and beyond economical repair, but they can be maintained with a bit of care. However, these repairs can be costly and cause significant disruption to your home. To avoid this, many homeowners choose to replace their windows with PVC-u windows from one the large "one stop shop" installation companies. They can take down and replace all windows in a home in just one day, eliminating the need to co-ordinate different tradesmen and making the whole process much more efficient. These windows can be fitted with energy-saving double glazing to get higher energy ratings than the traditional windows with sash. However these double-glazed units are unable to reproduce the proportions and section of the sashes made of timber from the past.

3. Security

Traditional windows can be made secure without compromising their aesthetics. Ironmongery, such as mortice bolts, sash chain and sash locks can be installed. They can be positioned in a way so that the window can still be open for ventilation and cleaning. These products are often unobtrusive as they are designed to be used in conjunction with sash windows. They can be used in conjunction with traditional sash window catches. These should be replaced by more robust versions like those with double screws, or sprung levers to decrease the chance of being struck by hammers.

Sash-window frames were traditionally constructed from slow grown deal or, in the more luxurious homes they were made from oak. Where glazing bars have survived they should be kept and where feasible, the wood of the cill should be replaced with identical wood. PVC-U companies usually provide a one-stop shop installation service that can remove and replacing windows across a house in a day without the need to engage other tradespeople, or coordinate visits from different suppliers.

4. RepairMyWindowsAndDoors

When sash windows first introduced in the 17th century, they allowed a substantial amount of light to flood into the buildings. At the end of the 18th century, they were altered to allow more light into rooms and bigger glazing panes started to be made. The result was a more streamlined appearance, and windows with a greater degree of elegance than before.

Sash windows were introduced, which required a new range ironmongery. Early pulleys were made from wood, whereas later Victorian ones could be made of brass or a combination of lead and wood, and there were various types of shutter hinges and knobs. The ironmongery pieces need to be cleaned and preserved to appreciate their beautiful design.

To ensure they remain in good condition, wooden windows require regular maintenance. Inattention to maintenance can result in:

Sashes that do not slide effortlessly.

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

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

Steel casement windows gained popularity in the I920s and I930s because they were sturdy and slim, cheap and complemented the trend for healthy living. Studies have shown that softwood sash window are just as effective as PVC-u windows and can even be more attractive.

The industry of replacement windows did a lot to convince homeowners that their old windows were decayed, drafty and beyond economical repair. The reality is that many older timber windows are in good shape and with minor repairs could easily be maintained for years to be.

5. Maintenance

A traditional sash window requires regular maintenance and inspection. Failure to do this can result in broken sash cords, excessive wear on the glazing bars, and degradation of the paint and putty. The removal of sashes may also cause structural movement in the frame, causing the sash to not close properly. The sash can also be stuck in an open position, which allows water and draughts to enter the building.

The damage to timber windows is often caused by water entry. This can be prevented by thorough painting, regular repairs, and removing the cause of dampness. Wet rot is easily identified due to the wavy appearance of the paint, which can be stripped to reveal rotting, soft timber. Any rotten sections of timber 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 maximises the amount of original fabric left, and is among the least invasive methods for treating timber-to-timber decay.

The use of a wood consolidant made from resin is an alternative to traditional staining and sanding. It is brushed on the surface of the timber to stabilize it and protect it from further damage. It is particularly beneficial for the treatment of sash cords and pulleys which can help prevent breakage.

It is crucial that any ironmongery from the past like sash stays and latches are retained and restored instead of replacing them. It is difficult to replace these items without compromising their original design. It is also recommended that modern aluminium fittings like sashlifts, as well as chainstays, be avoided as they can cause deterioration and corrosion of timber frames and sashes.