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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. Sash windows can get stuck and are difficult to open or close. double glazing repairs is often due to moisture, which can cause the timber to swell. Traditionally, box sash windows used chains or cotton cords and lead weights to operate. Modern sash windows come with hidden springs to overcome this problem. 1. Aesthetics Timber sash windows, in contrast to PVC-u windows, which are made in imperial sizes that are modular, can be restored to original dimensions. This allows for the restoration of timber sash windows in order to meet the current energy requirements and to comply with conservation regulations for areas. It also comes with a window that is far superior to uPVC options. Sliding windows with sash were initially only used in large buildings or public buildings. However, this changed when production became more affordable and artisans could create larger frames using greater glass. In the 18th century, windows made of sash were the predominant wooden style in a majority of British properties. Because they were simple to open, sash windows let light into rooms without curtains. Early windows were simple glass, but by the 17th century sash windows began to become more decorative with coloured glazing bars and moulded mullions. They were expensive at the time, but as glass production improved and cheaper they were a common feature in numerous period houses. In the 19th century, it was possible to produce large, strong glasses that didn't need supporting bars. This allowed for the frame to be enlarged which, in turn, provided an improved view. This was a significant innovation. Another important improvement was the introduction of the double-hung sliding windows at the end of the I920s and beginning of the I930s. This allowed both the lower and upper sash to be opened simultaneously, and gave improved ventilation to a building. Oak was used in older examples and more prestigious buildings. A parting bead is used to separate the two sashes and it is vital that it is maintained in order to avoid rattles and draughts. The sash pulleys, idler wheels and sash rollers also are crucial to the functioning of the window. 2. Energy efficiency As clearer and larger glass sheets became available, sash windows began replacing hinged casements. They were made of plate glass, placed within timber frames with rebates and secured with glazing sprigs, and then putty on both sides to create a watertight seal. This form of glass gradually replaced the leaded light bulbs. The introduction of sashes created a need for a much larger variety of ironmongery with the most basic fittings being brass pulleys as well as lead (and later cast iron) weights, sash stops shutter hinges, knobs and shutters as well as a range of fasteners that secured the sashes to their the right place. They were often decorated with motifs, inscriptions and engravings that identified the maker. Sash windows are energy-efficient with regular maintenance. But, if you don't maintain them, they may become drafty and let in cold air. Paint and putty can cause draughts too. This can be remedied by using proprietary wood-to-timber repair products. The replacement window industry relies on the belief that traditional windows are rotten and beyond repair, but they can be easily maintained with just a little care. However, repairs to these windows can be costly and cause significant disruption to your home. To avoid this homeowners often opt for a complete replacement with PVC-u windows from one the large 'one stop shop' installation companies. They can replace all windows in a home in one day, thereby saving time and avoiding the need for various tradesmen to coordinate. They are also available with energy-saving double-glazing to get greater energy efficiency than those offered by traditional windows with sash. However these double-glazed units are unable to duplicate the proportions and section of traditional timber sashes. 3. Security Traditional windows can be made secure without compromising their appearance. Ironmongery, such as sash chain, mortice bolts, and sash lock can be installed. These can be installed in such a way that the window can still be open for ventilation and cleaning. They are usually not noticeable since they are designed to work with sash windows. They can be used with traditional sash window catches. These should be replaced with more robust versions, such as those that incorporate double screws or spring levers in order to reduce the possibility of being struck by hammers. Sash-window frames are typically made of oak or slow-grown deal. Where glazing bars have survived they should be kept, and, if feasible, the wood of the cill should be replaced with matching wood. Many PVC-U companies provide a one-stop shop installation service. They can take down and replace windows throughout a house in just one day, without the need to involve other tradespeople. 4. Ventilation Sash windows were introduced in the 17th century and allowed for a huge amount of light to be absorbed into buildings. By the end of the 18th century, they were altered to allow even more light into rooms and larger glazing panes began to be produced. The result was a lighter look and windows that were more elegant. Sash windows were introduced and required a new range ironmongery. Early pulleys could be made of wood. Later Victorian ones were made of brass or a mix of leaded and wood. There were also a variety of types of knobs and shutter hinges. These ironmongery pieces must be maintained and cleaned to appreciate their exquisite design. To keep them in good shape, timber windows must be maintained. Lack of attention to them regularly can result in: Sashes that do not slide easily. holes in the frame allow water causing damage and decay. break down of putty allowing water penetration that could lead to decay of the frame and cill. Steel casement windows gained popularity in the I920s & I930s because they were strong and slim, cost-effective and complemented the trend for healthy living. Research has proven that softwood sash window are just as effective as PVC-u windows and can even be more attractive. The replacement window industry has made a significant effort to persuade house owners that their traditional windows are dirty, noisy and beyond economic repair. The reality is that many older windows made of timber are in good shape and with minor repairs could easily be repaired for many years to come. 5. Maintenance A traditional sash window needs regular maintenance and inspection. If you fail to maintain your window's sash, it could lead to the sash cords breaking, and the glazing bars wearing out excessively. It can also cause paint and putty to deteriorate. The removal of the sashes could also result in structural movement within the frame which causes the sash to be misaligned and unable to close correctly. The sash may also become stuck in its open position, allowing water and draughts to enter the property. The damage to timber windows is often caused by water entry. This can be avoided with regular maintenance, thorough painting and removing the source of dampness. Wet rot can be identified by the wavy look of the paint that can be stripped to reveal soft, rotting wood. Any timber that is rotting should be cut off and the affected area should be carefully wrapped or pieced back using replacements made of the same type of wood as those remaining. This method of repair maximizes the amount original fabric and is one of least invasive ways to treat timber-to-timber rot. 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 timber to help stabilize it and protect it from further damage. It is especially useful for treating pulley cords and sash where it can prevent breakage. It is important that any old ironmongery such as sash stay and latches be kept and restored instead of replacing them. These items can be very difficult to replace without compromising the the original design. It is also recommended that modern aluminium fittings like sashlifts and chainstays, are avoided since they can cause corrosion and deterioration of timber frames and sashes.