After running tests and reviewing exterior and independent data, the BRE concluded that Accoya wood, provided best design practice is followed, has a service life expectancy of 60 years when used in exterior applications such as timber windows, doors, siding, wooden window frames and balconies. The BRE stated that Accoya wood shows excellent durability and stability properties. This position has been positively corroborated by TRADA and Heriott Watt University / Imperial College London conducting similar service life reviews.
Accoya is also recognized by WDMA Hallmark Certification Program.
Accoya thermal conductivity has been assessed by IFT Rossenheim, Germany in accordance with EN 12664 and then developed into the required declared value format, under the most rigorous European assessment methods by the EN ISO 10456: 2008 procedure for determination of declared and design thermal values.
In comparison to other standard wood types for joinery, Accoya thermal conductivity is:
› Superior to softwood by 8%
› Superior to hardwood by 30%
These improved levels provide options in design, in terms of achieving a higher U- value for the same window design by switching timber type, or alternatively using
a more preferred aesthetic or production friendly design without significantly compromising energy efficiency.