Accoya wood’s durability makes it very long lasting, at least:
- 50 years above ground
- 25 years in-ground or freshwater contact
Accoya wood forms an effective barrier to mould and insect attack; it is indigestible to microorganisms and insects and therefore more durable to wood-destroying fungi and virtually rot-proof.
2. DIMENSIONAL STABILITY
Accoya wood offers outstanding dimensional stability in both radial and tangential directions (thickness and width) meaning that it has minimal swell and shrinkage and may be confidently used in applications where it will encounter varying moisture conditions – even in freshwater immersion.
Tests have shown a reduction in swelling caused by moisture uptake of 75% or more. From oven dry to water saturated conditions, the swelling and shrinkage of acetylated wood is only minimal and, in fact, better than tropical hardwoods.
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, woods treated with toxic chemicals and non-renewable carbon intensive materials such as plastics, metals and concrete. Accoya wood is fully reusable and recyclable. Reuse is recommended but Accoya may be safely incinerated for bio-energy.
Accoya® wood’s superior coatings performance is primarily due to its outstanding dimensional and UV stability. This effectively means that major coating systems can be used on Accoya® with significantly improved performance.
Accoya wood has superior resistance to UV degradation, with extensive tests demonstrating that the natural beauty of the wood lasts longer in even the severest exposed conditions. UV resistance of wood improves the life of any coating by providing a sound coating substrate. It also allows a wider range of feasible colour options. For example, very light pastel coloured stains and clear coatings can be safely used because Accoya will not darken quickly and ruin the effect as most other woods do.
5. QUALITY AND EASE OF USE
Each batch is analysed and Accoya wood always meets the requirements of Durability Class 1 for Use Classes 1-4 in accordance with EN 350-1 & EN 335-1. Because Accoya wood is modified all the way through, rather than just at the surface, when it is cut, planed or jointed there are no exposed unprotected surfaces in any dimension. This completely removes the need to apply additional chemical preservatives as is necessary with unmodified or envelope treated woods. Accoya wood is easy to machine and process manually, creating no challenges for product manufacturers and end users. Accoya wood can be fixed in the same way as other commonly used softwood species. As with most durable woods, Accoya contains a small amount of acid. It is therefore strongly recommended that corrosion resistant fixings, such as high quality stainless steel, are used.
Accoya wood inspired OAK architects to design two wooden heavy traffic road bridges for the city of Sneek in the Netherlands. Accoya was finger jointed and laminated into large sections measuring 1.08 x 1.4 metres to create these innovative structures, the first of their kind in the world. Accoya wood is a brilliant material for windows and doors as it offers improved thermal insulation in comparison with commonly used wood species and is more durable and dimensionally stable than the best tropical hardwoods. Coatings last longer and it is perfect for transparent, translucent or opaque coatings … whatever captures your imagination. Accoya wood is suitable for cladding, siding and façades where aesthetics, stability, durability and less frequent maintenance are considerations. Here it is used to clad a contemporary extension using an inclined open boarding system, finished with an environmentally friendly dark stain. This is only possible using a wood as stable and UV resistant as Accoya. In specifying decking, jetties and pontoons, beauty, strength and all-weather performance are important. A dimensionally stable material that will stay flat and has very minimal bow, cup, warp and split and will not be affected by fungi or rot is desirable. It is also important that the wood is non-toxic and therefore safe for people and animals. Accoya wood meets these requirements. Accoya wood is an excellent choice for shutters, louvres and solar shading. At Scottish Widows’ Exchange Place development, eye-catching bespoke solar shading and ventilation louvres were incorporated to prevent excessive heat gain. The system included 1,060 Accoya wood fins. The solar shading has a life expectancy of 60 years and the finish applied carries a 10 year warranty.