Accoya Decking
Accoya Wood
ETT Fine Woods is proud to be a manufacturing partner of Accoya wood.
Accoya wood is made by Accsys at its plant in
Arnhem, in the Netherlands. Accsys transforms
fast-growing, certified sustainable wood into
Accoya wood through its proprietary acetylation
process.
The result is high performing wood with
sustainability credentials that exceed those of
man-made, resource depleting, carbon-polluting alternatives.
About Accoya Wood
Accoya wood is highly resistant to shrinkage, checking, splintering, insect infestation, decay, and rot.
Accoya is low maintenance, withstanding extreme weather conditions even when used in boat docks and heavy-duty flooring.
Accoya wood combines high performance and long life durability in varied conditions, with sustainability credentials including Cradle to Cradle Certified® Gold certification.
How is Accoya Made?
Acetylation wood technology permanently modifies the wood to prevent it from being able to absorb water rather than treating wood with a toxic chemical to try to stop rot or insect attacks. The result is real wood that doesn’t rot.
According to Accsys:
Treating or modifying wood by subjecting a softwood to a vinegar, which turns it into a hardwood by preventing the cells in the wood from being able to absorb water.
So acetylated wood is… Pickled wood?
More or less. Yes.
Ok the chemistry behind ‘turns it into’ is a little complex, and the vinegar is acetic anhydride. Not quite the malt vinegar for your fish and chips. But the principle is there.
Click here to visit Accoya’s website to learn more about the acetylation process.
Accoya Ecolabels - a Certified Green Material
Accoya voluntarily complies with a variety of independent environmental assessments through LCA and carbon footprint. In addition, Accoya actively seeks to acquire the most respected ecolabels available and has been widely recognized in the field of sustainability. To view details of all assessments and certifications, please refer to Accoya’s website.
All Accoya is sustainably sourced and verified using FSC® certification. The Forest Stewardship Council (FSC) certification system is an international standard for responsible forest management. It ensures that wood products are sourced from forests that meet strict environmental, social, and economic criteria.
ETT Fine Woods offers Acoya decking and siding with pre-grooved (PG) and tongue-and-groove (T&G) profiles, as well as custom millwork for special profiles. We also stock accessories such as fasteners, sealers, cleaners, and finishes.
Accoya Decking FAQ
How is Accoya wood graded?
Accoya is graded and sold based on their proprietary specifications and performance characteristics rather than visual or structural grading systems.
“Clear grade” has a uniform grain and is virtually clear.
Does Accoya carry a warranty of any kind?
Yes. Accoya has a warrantiy provided by Accsys, the manufacturer of Accoya wood. This warranty is 50 years in above ground applications and 25 years in ground or fresh water conditions. Accoya’s warranty gives you the peace of mind your project will last for decades.
Can Accoya be installed on existing SYP pressure treated framing?
Yes, although we recommend that a professional inspect the integrity of the existing framing to ensure it is stable, usable and passes your current city code requirements. Be sure to follow the manufacturer’s recommendations.
Can Accoya be painted?
Accoya decking can be painted, but it’s generally not recommended for horizontal surfaces like decking.
What spans can I expect from Accoya Decking?
Due to the strength of Accoya, you can expect the following spans:
1x (net 3/4″) – up to 16″ on center
5/4x (net 1″) – up to 24″ on center
Diagonal patterns may require shorter joist spacing
We recommend that you check with your local building code before deciding on joist spans.
Coatings & Finishes
A wide variety of colors and coatings can be applied to Accoya decking. ETT Fine Woods offers both uncoated and Accoya grey material.
Accoya Grey
Oiled
Uncoated
About Accoya Grey
What color is Accoya Grey?
Factory-treated Accoya grey is designed to mimic the weathered silver-grey look without needing to wait for natural aging. The greying is only cosmetic and does not affect durability or structural performance.
When does Accoya turn silver grey?
Over time Accoya gray will fade further to a silvery-gray patina, similar to aged teak or ipe. Graying typically begins within a few months and becomes more uniform over 6–18 months, depending on the climate and sun exposure.
Can Accoya grey be coated to maintain the unique color?
Yes. If further weathering is not prefered, a sealer can be applied.
About Accoya Uncoated
What color is Accoya Uncoated?
All Accoya is offered with no coating with an initial pale or blond color when first installed.
Can Accoya be coated? How is color maintained?
Yes. If natural weathering is not prefered, a stain or sealer can be applied, with or without a color tint.
When does Accoya turn silver grey?
Over time Accoya will fade to a silvery-gray patina, similar to aged teak or ipe. Graying typically begins within a few months and becomes more uniform over 6–18 months, depending on the climate and sun exposure.
Accoya Decking Profiles
Tongue & Groove Porch Flooring
Tongue-and-Groove Porch Flooring allows for interlocking of decking boards. This is offered in 1×4 and 5/4×4 Tongue-and-Groove (T&G) Porch Flooring for exterior covered porches. Accoya T&G Porch Flooring typically runs in random odd and even lengths from 8′ to 16′.
1x4 T&G Profile
This Profile measures net 11/16" x 3".
5/4x T&G Profile
This profile measures net 15/16" x 3".
Siding
ETT offers standard shiplap siding profiles for exterior vertical spaces. Shiplap Siding typically runs in random odd and even lengths from 8′ to 16′. Our standard profile measures net 9/16″ x 4-3/8″ face. Also known as “lap and gap”, we can custom-mill various profiles and sizes by request, please call for details and pricing. Learn more.
Accoya Decking Sizes
Standard: 8′, 10′, 12′, 14′, and 16′
Please contact us to find out our current stock levels, sizes and lengths available as they vary at any given time. We also offer millwork services for special sizes or profiles.
4/4
5/4
Timbers, Rails, and Plugs
Accoya Decking Installation Guide
Download PDF
Accoya Decking Care Guide
Download PDF
Washington Product Line Card
Download PDF
Wood Species Guide
Natural woods vary in performance characteristics from one another. This wood comparison chart helps you compare hardness, weight, fungal resistance, and more. Use the wood comparison guide to help you find the right wood for your project.
Locations
Locations are strategically placed throughout the United States to serve our customers. Products stocked at each location are different based on customer needs.
