Accoya wood has been produced commercially since 2007 and used extensively around the world on a range of exterior applications. It represents a major development in wood technology that has made the consistent supply of durable, dimensionally stable and reliable wood a reality. Accoya wood's performance credentials have been extensively researched and repeatedly demonstrated. Accoya has properties that exceed those of world's best woods yet it is manufactured by modifying wood sourced from well-managed sustainable forests without the introduction of toxins.

Accoya is the world's leading high technology wood. It is produced from a non-toxic cellular modification process known as acetylation. The softwood used in the process is Radiata Pine sourced from sustainably managed forests in New Zealand. The result is a durable, stable and non-toxic material with performance characteristics better than any hardwood. Accoya wood is modified uniformly through the cross section, not just at the surface. Modification quality of each batch produced is validated by a range of sophisticated and proven tests that takes place in Accsys Technologies laboratories. This quality control approach is independently audited by organisations from USA, France and Netherlands.

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Ideal for cladding, decking, joinery, panelling, furniture, exterior and interior mouldings and much more in the New Zealand environment.

New Zealand weather conditions can be harsh, and houses are built in exposed sites, to take into account the natural environment. 

Those demanding quality and durability have an option of Accoya®. Accoya® is a high performance, sustainably-sourced wood. Accoya® undergoes a proprietary, non-toxic acetylation process that permanently modifies the wood to the core.

Red Beach House


The result is an environmentally friendly solid wood with durability, dimensional stability and beauty that matches or exceeds even the best tropic hardwood.

Accoya® wood is sourced from sustainable sources, including FSC® and has class leading environmental credentials such as Cradle to Cradle™Gold certification by the highly prestigious McDonough Braungart Design Chemistry (MBDC) organisation.

Accoya® wood is perfect for demanding applications such as windows and doors, where it is important that tolerances are tight yet regardless of the conditions, they open year round. Accoya® is perfect for siding where wood's natural beauty is desired, but sustainability and high performance are of the utmost importance. In decking, where it is important that boards do not warp, twist, bow split, Accoya® is up to the challenge.



Contact with metals

Accoya wood is acidic and we therefore stipulate the use of Stainless Steel 316 fixings.. 


From a technical performance perspective, in respect of attributes such as durability and dimensional stability, there is no need to finish Accoya wood. However, like any natural wood species, Accoya wood is susceptible to weathering in outdoor circumstances.


Because Accoya wood has a very high resistance against rotting, a popular choice is to use it in various applications uncoated. It will be left to weather naturally to a silver-grey colour, due to physical and biological processes that takes place within top layer.


A wet and dry board may vary in appearance. Due to installation details, the presence of shaded areas and the natural differences in the wood between boards some may dry quicker than others. not only does this reflect on the appearance of the surface while drying, it will also have an influence on the development of moulds, algae so on.

Surface Growths

Acetylation of wood as such a non-toxic process process does not seem to have an influence on the resistance against surface mould and yeast growth. However, in damp areas there is high risk that surface growth will develop on Accoya wood, as they would on other softwood species, but the incidence of blue stain development is rare.

Accoya is supplied as rough sawn and planed wood in various sizes and grades.

Key Benefits

Extensive laboratory and field testing by leading institutes around the world (including in New Zealand, USA, UK, Sweden, Malaysia, Indonesia, the Netherlands and Japan) has shown the performance of acetylated wood to be extremely reliable. Accoya® wood has been thoroughly tested for dimensional stability, durability, paint retention and in-ground conditions to ensure optimal performance. Indeed, it is so reliable that for many years it has been – and continues to be – used by scientists as the benchmark against which other treatments and modifications are measured.


From Sustainable Sources

From Sustainable Sources

Outstanding Durability

Outstanding Durability

  • Lasting 50 years above ground, 25 years in ground/freshwater
  • Class 1 durability, surpassing even teak
  • Virtually rot proof 70 year minimum service life stated by TRADA
Non-Toxic & Recyclable

Non toxic and Recyclable

  • Protects the environment from the harmful effects of common treatments
  • May be safely reused, recycled and incinerated

Great for decks, windows, doors, cladding and more Accoya® wood is perfect for demanding applications such as windows and doors, where it is important that tolerances are tight, yet regardless of the conditions, they open year round. Recent tests show that Accoya® wood is perfect for coated cladding where reduced maintenance is required, even with wood stains and dark colours. In decking, where it is important that boards do not warp, twist, bow split, Accoya® is up to the challenge.

Other Resources

Species Technical Information

Read more about the benefits of Accoya timber here...


New Zealand Herald

Read the article on Accoya in the New Zealand Herald here.

Accoya Videos