Through the use of a non-toxic acetylation process, sustainable timber (Radiata Pine) is modified to create Accoya® wood; a uniformly attractive, consistently durable and dimensionally stable product which is fully sustainable and will last a lifetime.
It is highly recommended that Accoya wood is coated, with an opaque (solid) finish, as its outstanding dimensional stability properties ensure a clean, sound surface; the perfect coating substrate. Virtually no shelling, cracking, checking or fissuring will occur, and the paint can be expected to last at least twice as long as on unmodified woods.
In its natural form, Accoya wood is a cream/light straw colour. However, we would not recommend leaving it to weather, as the uncoated surface of Accoya wood is susceptible to blue stain mould and uneven UV weathering, which may result in an inconsistent colour when wet.
Accoya wood is available in four grades (A1, A2, A3 and B). Russwood only supply the cleanest grade - A1 - to the minimum specification outlined below.
For advice on completing the NBS H21 for Accoya wood please get in touch with our project team.
Accoya wood boasts outstanding and consistent durability properties, being categorised as Class 1 (by BS EN 350-2) – the highest possible rating for timber. After each batch of timber has been modified, its properties are analysed, ensuring that the durability at least matches, and in many cases exceeds, the performance of the world’s most naturally durable species.
Accoya wood is indigestible to a wide range of insects, including termites, and forms an effective barrier to any attack. The wood is virtually rot-proof, which helps to ensure that, when properly maintained, it can be expected to have a lifespan of over 100 years when subject to general outdoor exposure.
The way a façade is fixed and detailed can have a major effect on it’s lifespan. Our range of fixings and systems are designed by Austrian Timber Engineers to make cladding look better and last longer.
A key feature of Accoya wood, and one of the primary reasons for its popularity as a cladding material, is its outstanding dimensional stability. The benefits of this stability are:
These enviable stability levels are a result of the modification process, which changes the structure of the timber and results in it having an extremely low moisture content of 8%. Although Accoya wood absorbs moisture more slowly than other species, it can take longer to dry out. Consequently, extra care should be taken when storing this product, and the moisture content should be measured to the core of the boards to ensure that the reading is accurate.
In comparison to most of Russwood’s other timbers, Accoya wood is very lightweight; approximately 465kg/m3 at a moisture content of 8%. As a result of this low density, the product is easy to work with and install.
By combining the impressive benefits of vacuum coating with the incredible stability and durability of Accoya wood, remarkable results can be achieved, due to the following features:
Timber swelling and shrinkage is virtually eliminated in Accoya wood, meaning that the vacuum coating is not subjected to such severe stretch and shrink cycles. This enables the coating to last for up to three times longer, thereby substantially reducing maintenance frequency and associated costs.
Accoya wood is one of the few timbers listed as durability Class 1, meaning that it is virtually rot proof. The advantages of this are that the overall lifetime value of the product is extremely high and it provides a perfect coating substrate. For further durability information, including test results, go to the download section of the Accoya website.
Accoya wood can be vacuum coated, at Russwood’s in-house state of the art vacuum coating facility, with your choice of opaque coating from our Teknos range. For information about the benefits of vacuum coating, as opposed to on-site paint application, please go to our vacuum coating page.
Accoya wood cannot currently be fire-retardant treated, although rigorous tests are ongoing to find a treatment solution.
How timber is fixed is fundamental to it’s long term performance in terms of both appearance and durability. We offer a range of fixings and systems to make cladding look better and last longer. These systems can be written into the NBS H21 specification. For more information on our recommended fixings, click here.
We can advise you on the most suitable species and profile for your project. Visit our profiles section to view some of our most popular profiles, or speak to us to discuss further options.
Accoya wood is sustainably sourced, non-toxic and can be safely re-used and recycled. Additionally, it is certified as such by the Forestry Stewardship Council® (FSC®) and the Programme for the Endorsement of Forestry Certification Schemes (PEFC). For further information on the sustainability properties of Accoya®, please visit; accoya.com/sustainability.
We supply Accoya wood in lengths of 2.4 to 4.8m, in widths of 100 to 200mm and in sawn thicknesses of 25, 38 and 50mm. Please note that cladding is supplied as a linear meterage based on random stock lengths at time of picking order. Other sizes may be available on request.
Accoya wood is one of Russwood’s premium range products, although we recommend that it is supplied Vacuum Coated the lifetime costs are much lower than many other timbers due to the reduced requirement for maintenance and replacement. Please contact a member of our sales team for a cost estimate.
Accsys Technologies has launched the Accoya® Academy, an easy to use, online Architects and Manufacturers educational tool. It further explains the acetylation process, the benefits of acetylated timber and also highlights certain Accoya® case studies from around the world. To visit the Accoya® Academy, click here.
Please note that we have only listed the most popular profiles for each product but there may be others available. Please speak to us to discuss the best options for your project.
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