Box Sash Windows
We strive to keep the original charm of a property by replicating the existing elegant, traditional weighted sash window whilst adding the modern benefits of double glazing and draught proofing. With a deep understanding of the rich heritage of the sash window, the profiles of the window, mouldings and construction methods, our experienced craftsman use age old techniques to provide the highest quality window and with a range of materials to suit multiple situations.
The sash window is synonymous with all Georgian, Victorian and Edwardian properties across Britain. The earliest known use of sash windows was in the later part of the 17th Century, at Chatsworth, Ham House, Hampton Court Palace and Kensington Palace. Royal patronage and its adoption by Sir Christopher Wren made the sash window very fashionable in both old and new buildings. Before the great fire of London windows initially were positioned flush with the front face of the building. This style can still be seen, mainly near the outskirts of London or the countryside. An analysis of the great fire showed that exposed timber was a major contribution to the spread of the fire. The London Building act of 1709 decreed that all windows be set 4 inches back from the outer brick-work or masonry. In 1774, to further reduce the risk of fire, the box containing the cord and weight mechanism (previously exposed) was required to be set behind the masonry and this is the most common arrangement seen today.
Softwood: Premium Whitewood
We use a premium cut of various European Redwoods including; silver fir, yellow pine and spruces. Our standard box sash frame (except the sill) is made in softwood in order to keep the cost of the window down as the frame is typically hidden behind the external brickwork and away from the bulk of the weather. Any knots on the timber is treated to ensure no leakage through and with our meticulous spray painting process the timber has long lasting protection against the elements. The option to make the entire window in hardwood is available on request.
Hardwood: Dark Red Meranti
Distributed from South East Asia from sustainable forests Meranti is used for all of our sashes and sills as standard because these aspects of the window are exposed to the weather. Durable, dense and has less seasonal movement compared with similar hardwoods like Sapele. Full hardwood frame options should be considered where peace of mind is needed, i.e. windows that are not accessible often, in a rental property or when the frame too is exposed to the elements.
High Performance: Accoya
A softwood that is modified through a process called Acetylation the wood is chemically altered improving its technical properties and making it stronger and more durable. Any timber is susceptible to expansion and construction, particularly when used outdoors through the absorption of water. In Accoya, hydrogen, oxygen and carbon chemicals (called acetyl groups) are created within after the acetylation process, changing the cell walls and reduces the absorption of water by approximately 80%. In addition to a stronger more stable timber, this process makes the timber virtually rot and insect proof. Should there be a requirement, such as in coastal areas, we make the window from Accoya and giving the window a guarantee of 50 years.
As standard all of our box sashes are made using UK manufactured, high wax cotton sash chord with a polyester core for additional strength. These chords are run through the pulleys, counter balanced on either steel or lead weights and can be accessed through the traditional pocket system in the frame. If requested we can construct a window to have a spring balance system, but please note that springs will eventually lose their tension whereas the weights are mechanical and can last a lifetime.
The windows should ideally be cleaned at least once a year using warm soapy water, in the years to come if there are any chips or cracks these can be rectified at minimal time and cost. However, if these breaks in factory finish are given time to spread over 5-6 years the cost of repairing would increase. If the affected area is hardwood, then the time taken to correct this is forgiving (in Accoya even greater) but a well-kept window will outlast any resident.
The Todi&Boys name is synonymous with a high quality finish, a finish that has been obtained through years of refinement, feedback from clients and has evolved our windows into one of the most sought after in London.
All of the frames sills and the sashes are dipped into a wood preservative to ensure an extra level of protection against rot. Once dry the windows are primed, dried, primed again, sanded, filled and the glass is then installed into the sash. We firmly believe in order to achieve a high quality finish in addition to creating a seal of paint against the glass, the glass needs to be installed and masked before painted. Once the glass is in, we give the first topcoat, once dry we sand lightly before applying a second topcoat, clean the glass and wrap ready for delivery or installation.
All of our four water based paint coats are microporous, which allows the timber to ‘breathe’. Through the seasons, as the timber expands and contracts the paint allows for the movement and therefore does not crack. As standard we spray all of our windows white throughout with a matte finish, although we can offer a close colour match to any Farrow & Ball, Dulux or RAL swatch.
The insulating layer in double glazing keeps the cold temperatures on the outside from affecting the climate on the inside. The benefit for you is that it is noticeably warmer as the shift from single glazing to double glazing will reduce heat loss through your windows by over 70%. A U-value is a measure of how effective a material is at insulating. When replacing a window, current building regulations dictate that you would need to achieve less than a minimum U-value of 1.6 W/m2k. To put this into perspective, a single glazed window is (roughly) 4.3 W/m2k. The change between single glazing and double glazing is massive, but at Todi&Boys we don’t believe you need a thicker double glazed unit to achieve marginally increased U-values as a thicker double glazed unit has a knock on affect. If we have a thicker double glazed unit, we need a thicker sash, a thicker frame and as a result we lose the elegance of the window for the sake of -0.2 W/m2k. As a result, we keep to the minimum requirement of 20mm double glazing with a varying options shown below.
Standard Glazing / Toughened Glazing
20mm Double glazing comprised of 4mm toughened (if required), 12mm Argon filled cavity, 4mm Planitherm Total+. White warm spacers and Georgian spacers as standard but also available in grey and black. Whole window U-Value of 1.5 W/m2k
Standard Laminated Glazing
22.4mm Double glazing comprised of 6.4mm laminated, 12mm Argon filled cavity, 4mm Planitherm Total+. White warm spacers and Georgian spacers as standard but also available in grey and black. Whole window U-Value of 1.5 W/m2k
22.4mm Double glazing comprised of 6.8mm laminated with a sound dampening interlayer, 12mm Argon filled cavity, 4mm Planitherm Total+. White warm spacers and Georgian spacers as standard but also available in grey and black. Whole window U-Value of 1.5 W/m2k and a sound reduction of -36 db. Please ask for an acoustic glazing brochure for more details.
12mm Double glazing comprised of 4mm toughened (if required), 4mm Kyrpton filled cavity, 4mm Planitherm Total+. Spacer is only available in black, whole window U-Value of 1.9 W/m2k
14mm Double glazing comprised of 4mm toughened (if required), 6mm Kyrpton filled cavity, 4mm Planitherm Total+. Spacer is only available in black, whole window U-Value of 1.5 W/m2k
We understand that it may be a little worrying having strangers arriving, ripping the windows from the walls and having your nice home covered in dust and debris. Our installation teams are well trained, have years of experience replacing windows in London homes and will take great care whilst working quickly to make sure the installation takes days rather than weeks. All walkways will be covered in polythene plastic sheeting, the working areas will be covered in dust sheets and any larger items that cannot be moved prior to the fitting will be covered with sheets. The team will endeavour to do as little damage to the walls as possible, any damage caused will be made good, and unless specified otherwise we will install our standard primed ogee architrave and primed window sill, only leaving light decorating work to be done around the windows. We will remove and dispose of the existing windows, clean around the affected areas and making sure your home is left in the same condition as when they arrived.
Should you be undergoing larger refurbishments throughout your house and have builders or other tradesmen on site then it may be more cost effective to opt for our joinery fitting. This installation requires that the windows be removed and disposed of prior to our arrival. Our team will install the new windows and the remaining making good will be done by other parties after we have left. A joinery fit means that we can install all the windows in the house within a day.
After the installation, some light decorating would be required around the windows, in the past some clients have carried this out themselves, some know or have a decorator already at their home but if you require a decorator for the purposes of touching up then we can have our in house decorator follow us and give a quote on the decorating based on the amount of work required.
We also recognise that some clients may not like a spray finish, prefer a hand finish and in this scenario we would install the windows primed. At the client’s request we can offer a competitive quote to have the windows decorated on site after our installation is complete. If the windows are installed primed we only ask that at least one topcoat is painted within the first two weeks. Without adequate protection the sashes could swell and lead to decreased performance of the window.
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