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The possibilities wood offers can be seen wherever we look: as furniture, decoration, musical instruments, structures – wood is a material that is aesthetically pleasing, endlessly practical and is our only naturally renewable building material. However, as an organic material that is susceptible to its surroundings, wood presents natural challenges when used for certain exterior applications.
IDEAL FOR WINDOWS,
Accoya® wood is the result of decades of research and development that has brought together a long-established and extensively proven wood modification technique – acetylation – and leading-edge patented technology to create a high performance wood, ideal for outdoor use and challenging applications.
Accoya® wood is modified all the way through, not just at the surface like traditional envelope treatments. This modification technique has two key advantages:
ENABLING NATURE NATURALLY
Acetyl groups are already naturally present in all wood species. This means that the manufacturing process adds nothing into the wood that does not already naturally occur within it. The end product, Accoya® wood, does not add toxins to the environment.
ACETYLATED L-JOINTS OUTPERFORM ASA AND UNTREATED L-JOINTS AFTER 15 YEARS*
The BRE (Building Research Establishment) is an independent institute based in Watford, UK. In durability field testing to European Norm (EN) 330:1993 – which parallels America Wood-Preservers’ Association (AWPA) E9 – simple mortice and tenon joints (L-joints) are assembled, coated and placed outside, with the coating over the joint deliberately broken to allow typical water ingress. This test represents a worst case scenario for joinery
EXCELLENT COATINGS PERFORMANCE TESTED BY BM TRADA
The translucent stain finish was seen to have remained fully intact over the 42 month outdoor exposure period on all the boards with no visible failures in evidence apart from where the coating had been broken by an end-fissuring. No evidence of any peeling of the stain coating was seen along fissures where they occurred. No evidence of mould colonisation was observed on any of the boards. Other competing cladding material coatings failed in the same tests with severe issues.
LONGER LASTING COATINGS
Accoya® wood is the ultimate substrate, and its lower maintenance requirements add to its cost effectiveness and environmental credentials. Coatings may be transparent, translucent or opaque, allowing for more adventurous colour schemes that will endure.
TRIED AND TESTED
Extensive laboratory and field testing by leading institutes around the world (including in New Zealand, USA, UK, Sweden, Malaysia, Indonesia, Russia, the Netherlands, Germany and Japan) has shown the performance of acetylated wood to be extremely reliable.
Accoya® wood offers dimensional stability (resistance to swelling and shrinkage) in both radial and tangential directions. Tests have shown up to 80% reduction in swelling caused by moisture uptake, depending on the source species and conditions. From oven dry to water saturated conditions, the swelling and shrinkage of acetylated wood is only minimal and, in fact, better than tropical hardwoods. Dimensional variability resulting from thermal changes (ambient or radiant temperature variations) is, like most woods, minimal.
Accoya® wood has been tested over prolonged periods in all types of weathering conditions – above ground, below ground and even in water – and has been proven to withstand even the toughest of external environments. Not only is its durability proven, but it has also been shown to retain its appearance, requiring much less frequent maintenance than other wood species. This gives added reassurance to the manufacturers, architects, specifiers, builders and property owners who have chosen Accoya® wood for a diverse range of projects. Accoya® wood is also being tested for additional uses by leading independent institutes worldwide.
WINDOW FRAMES, DOORS & SHUTTERS
Accoya® wood is the material of choice for these products as it has low thermal conductivity and is more durable and more dimensionally stable than the best tropical hardwoods. It may be finished with opaque coatings, or for those who enjoy the natural beauty of wood, finished with transparent coatings. Accoya® wood’s low maintenance requirements add to its cost effectiveness and environmental credentials.
PORCH AND EXTERIOR FLOORING
Accoya® allows solid wood flooring in environments previously unthinkable such as wet areas and over-radiant heating without risk of excessive distortion.
OUTDOOR FURNITURE & EQUIPMENT
Accoya® wood is perfectly suited to tables, chairs, play frames, planters and landscaping timbers as it is non-toxic and able to withstand the rigors of different weather conditions.
CLADDING, SIDING & FAÇADES
Accoya® wood is suitable for cladding, siding and façades where aesthetics, less frequent maintenance, dimensional stability and durability are key factors. Accoya® gives a wide range of coatings choices for unprecedented choice without compromising performance.
DECKING & MARINAS
In specifying decking, jetties and pontoons, beauty, strength and all-weather performance are important. A material that will not cup, bow, warp, split, swell or be affected by fungi, water uptake or rot is desirable. It is also crucial that the wood is non-toxic and therefore totally safe for people and animals. Accoya® meets these requirements, even in salt water splash zones.
BRIDGES & CIVIL WORKS
With its high strength to weight ratio and overall superior performance, Accoya® allows wood to be used in demanding applications such as heavy traffic road bridges. Certain environments are particularly punishing and few are harsher than canal banks where wood is used to hold back the earth, exposing it to water, microbe rich soil and - most obviously at the waterline - air. Accoya® wood offers unparalleled performance in this application, replacing tropical hardwood.
...THIS IS ACCOYA
By significantly enhancing the durability and dimensional stability of fast-growing and abundantly available certified wood species, Accoya® wood provides compelling environmental advantages over slow-growing hardwoods (which are often unsustainably sourced), woods treated with toxic preservative chemicals, and non-renewable carbon-intensive materials such as plastics, steel and concrete.
Accoya® wood is already being used for many new and exciting applications. It opens up all kinds of creative possibilities and is inspiring architects and designers to look at new and different ways of using wood instead of manmade products, safe in the knowledge that their creations will be sustainable and long lasting. Wherever you can imagine wood, imagine Accoya® wood.
Accoya® wood is produced from sustainably sourced, fast growing wood and manufactured using Accsys’ proprietary patented modification process from surface to core.
ACCOYA FINGER JOINTED SPECIFICATION
Accoya® finger jointed is bonded with EPI adhesive. It offers fixed width, engineered sections for joinery under the KOMO joinery certificate for finger joint quality. Accoya® has been finger jointed under the KOMO scheme successfully since 2007, predominantly for the Dutch market. NOTE: Finger joints are rated for use as joinery and not in-ground.
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