The ’50-Year Sash Window’ is our premium option. With over 30 years of research and development we have designed our sash window range to incorporate everything our customers had been asking for and more. With longevity and performance being the key factors, we combine traditional joinery methods with high performance double-glazing, draught sealing and the finest quality low maintenance micro-porous paint system, ensuring optimum durability.
Because our customers want their windows to last we have always used the highest quality wood available. Now 95% of all our sash windows are made from the best wood available on the market – Accoya® wood. Accoya® wood is the result of more than 80 years of research and development that brought together a long established and extensively proven wood modification technique – acetylation – and leading-edge proprietary technology to create a high performance wood.
Accoya® wood is the leading high-technology wood. Created from sustainably sourced wood, Accoya® matches or exceeds the properties of the very best tropical hardwoods. See above for some of its performance benefits.
Here at London Box Sash Windows we feel the glass that’s used in our sash windows has one of the most important roles of all, as most of our customers want to improve their quality of life and reduce energy costs by improving thermal performance. That’s why we glaze our premium sash windows to ‘A’ rated specifications, exceeding the latest building regulation requirements.
The windows are glazed with 24mm double-glazed units, comprising of low ‘E’ glass, argon filled ‘Swisspacer’ bar and Pilkington Optiwhite extra clear, low iron glass, which provides an indicative centre pane U-Value of 1.2 W/m2K.
To protect and prolong the life of our double-glazed units we have designed a unique drained and vented rebate glazing system to prevent premature failure of glazing unit seals by allowing any trapped moisture to drain through small, concealed drainage holes. This has allowed us to double our guarantee against premature failure.
Our sash window range can also incorporate a variety of other glass options to suit specific requirements:
One of our customers’ biggest concerns is having to paint their windows every couple of years. To minimise this requirement we spray finish all our Accoya® sash windows with the finest Teknos low-maintenance microporous paint systems, coupled with end grain sealing and highly-skilled spray application, giving us an unrivalled, long-lasting paint finish. Because our premium sash window range is made using Accoya® exclusively, maintenance cycles are greatly extended and on redecoration only require one topcoat.
We can also colour match to Dulux, Farrow & Ball, Crown or RAL.
Our premium sash window range comes fully draught sealed. They have a perimeter brush pile polypropylene stripping, discreetly contained within concealed carriers installed to all staff and parting bead, maximising thermal and sound efficiency.