ACCOYA® EXTERIOR WOOD CLADDING
A new world of external wood cladding & siding possibilities is available using Accoya® wood.
Accoya® timber cladding is a durable, dimensionally stable and beautiful material with the performance characteristics of the most durable tropical hardwoods but offering industry leading environmental and sustainability credentials. This makes Accoya® ideal for external wood siding as the cladding joints do not open, tolerances remain tight and twist is prevented. From exterior cladding for houses to large scale commercial siding projects, with a 50 year above ground guarantee, Accoya® wood is the ideal material for exterior wooden cladding where, aesthetics, stability, durability and less frequent maintenance are required. It can also be machine profiled to suit the building design and specifications. Due to Accoya® wood’s improved dimensional stability, the use of wider cladding boards is possible, allowing architects and specifiers greater design flexibility. Wherever wood cladding is needed, Accoya® is the right wood for your application.
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THE ACCOYA® WOOD CLADDING PROFILE
Assessment of the stability of 15mm thick Accoya® wood cladding boards. Based on findings and observations over the entire testing period (19th September 2013 – 25th November 2015), BM TRADA concludes that:
- Evidence of cupping was identified in unmodified radiata pine boards measuring 15mm thick and 195mm wide when exposed outdoors a the field test site during periods of dry/sunny and wet weather shows this test method promotes cupping.
- Since no cupping could be detected in Accoya® wooden cladding boards of identical dimensions exposed to the same conditions for a period of 2 years and 2 months, then BM TRADA is of the opinion that Accoya® cladding of 15mm thickness is likely to remain free from detectable distortion over its life.
ACCOYA® WOOD – IDEAL FOR CLADDING
IMPROVED COATINGS LIFE
Accoya® wood is the ultimate substrate, and its lower maintenance requirements add to its cost effectiveness and environmental credentials. Coatings may be translucent or opaque, allowing for more adventurous colour schemes that will endure.
USE OF WIDE CLADDING BOARDS AVAILABLE
Use of wider cladding boards is allowed by the improved dimensional stability.
TRIED AND TESTED
DURABILITY AND DESIRED SERVICE LIFE
Though BS EN350-2 does not strictly speaking apply to modified timbers such as Accoya®, the BRE have made an assessment that the durability class 1 rating achieved by Accoya® wood in trials is equivalent to class 1 of natural timbers. Therefore service life statements attributed in BS 8417 are applicable to Accoya® wood. Under BS 8417, only cladding made from timbers of durability class 1 are suitable for situations where there is a desired service life of 60 years.
SCION OUTDOOR STAKE TEST
Accoya® is tested alongside CCA H4, Teak and western red cedar at the SCION graveyard test field in Rotorua. Stakes are inspected on 12 month intervals by the SCION staff and scored on a scale from 10 (perfect) to 0 (totally destroyed). At the 10 year point only colour change has been noted for the Accoya® wood samples while all other wood types have either onset of decay or significant decay.
OUTSTANDING STABILITY
Leading Timber research institute, BM TRADA, tested the Accoya® wood against other widely used cladding materials by exposing coated boards to a high humidity environment and letting them acclimate. Accoya® wood showed exceptional results. On the basis of this and other trials TRADA support the use of thinner and wider boards than with other timbers, e.g. T&G 15mm thick and 195mm wide. This increased width specification board shows Accoya® wood’s design flexibility and superior performance when compared to western red cedar, larch and pine.
APPEARANCE AND WEATHERING
In its natural form, Accoya® wood is a cream/light straw colour. From a technical performance perspective, in respect of attributes such as durability and dimensional stability, there is no need to finish Accoya® wooden cladding. However, like any natural wood species, Accoya® cladding is susceptible to weathering in exterior circumstances and therefore can exhibit various types of discolouration such as moulds and uneven UV weathering. Accoya® wood has a very high resistance against rotting, making it a popular choice to use uncoated. It can be left to weather naturally and over time, will eventually turn a silvery-grey colour. The grey wood surface colour of unprotected wood exposed to outdoor circumstances is caused by UV. The rate of weathering of Accoya® timber cladding will vary depending on the amount of UV, elevation on a building, the surroundings and the surface structure. Non-film forming coatings can be applied if water uptake is not an issue. Oil-based stains and hydrophobic agents have water repellent properties, but often cannot prevent water uptake on horizontal parts. Any coatings or stains are best applied in controlled conditions before the cladding is installed to minimise maintenance.
Coatings and finishes
Accoya® wood has an enhanced coatings performance and can last 3-4 times longer saving time, money and hassle. These coatings can be translucent or opaque coatings… whatever captures your imagination! To obtain a “natural appearance” with reduced potential discolouration issues, a translucent (film-forming) coating, a non-film-forming coating, an oil-based stain or some other type of hydrophobic agent is recommended for Accoya® wood cladding. Its outstanding dimensional stability properties ensure a clean, sound surface – the perfect substrate.
Essential Coatings GuideHOW DO I BUY ACCOYA® CLADDING?
Accoya® wood cladding is sold via distributors across the world. Our distributors are timber specialists who can work with you to create bespoke profiles and finishes for your cladding project. To obtain Accoya® wood prices for your next cladding project, please click on the button below to find an Accoya® distributor in your region or country of choice.
Where to BuyHelpful Links
ACCOYA® CLADDING PROJECTS
Unique split level restaurant in Australia clad in charred Accoya® wood
Exterior Wood Cladding used for Villa Bie
Breakers Beach Bar & Restaurant, Noordwijk, The Netherlands
CERTIFIED BY INDUSTRY BODIES
Besides the independent environmental assessments through LCA and carbon footprint, we actively seek to acquire the most respected ecolabels available and have been recognised by others as an exemplary product and company in the field of sustainability on many occasions:
