During 2009, Deal Hospital in Kent began phase 1 of a refurbishment project for the replacement of existing sash sliding timber windows.
The original windows were installed during the construction of the Hospital in 1923. Although the general timber structure of the windows was still intact, the products were highly dated and featured single glazed units, paint damage and broken weight and pulley systems.
Deal Hospital began the search for a suitable product that would provide a similar high life expectancy. After consultation with an architect, the revolutionary Accoya timber species was brought to their attention.
Accoya® is a non-toxic, enhanced wood that holds Gold standard Cradle to Cradle certification, is sourced from sustainable, fast-growing forests and has significant environmental advantages over slow-growing hardwoods and woods treated with toxic chemicals. Accoya
® is frequently used for industrial and commercial developments, such as heavy traffic bridges, new builds and refurbishment projects.
In a new report, published in January 2011, BRE (Building Research Establishment) present the compelling results of 13 year field tests comparing the rot and decay levels of acetylated L-Joints against non-acetylated L-Joints.
L-Joint Field Trials
To create a worst case scenario for joinery products, simple mortice and tenon L-Joints were assembled, coated, the coating over the joint was broken, and then placed out of doors out of contact with the ground and exposed to the normal environmental and ecological factors at the BRE Garston field exposure site in Watford. In 1998, the L-Joints were installed south-westerly facing into the prevailing weather. Three acetylated L-Joints and three ASA (alkenyl succinic anhydride) preservative treated L-joints were tested and visually assessed after five, six, nine and 13 years’ exposure. This environment renders the timber susceptible to fungi that invade wood in the form of moulds, blue stain fungi, soft rot fungi and basidiomycetes.
After receiving the initial lead via a tender list, Dempsey Dyer approached the NHS
with details of their product range.
The traditional sash slider was recommended to the Hospital based on its high performance and high quality design/specification. The product features a ball race pulley system and English brass ironmongery which helps to create a smoothly operating and highly durable product.
The first phase of the contract was undertaken in December 2008 and was completed in March 2009. The contract included the manufacture and supply of 91 box sash sliding timber windows. The chosen specification featured the innovative Accoya® timber
, structural Georgian bar, double glazed units and a white finish to both sides.
The quality of the products supplied on phase 1 impressed the client requested the supply and manufacture of timber box sash sliding windows on the second phase of the refurbishment project.
This time, working through the main contractor 'EPPS Construction', 103 box sash sliding timber windows were supplied during the first half of 2011 for a clinic on the same site.