Stable, Durable, Sustainable, Versatile.
Stable, Durable, Sustainable, Versatile.
What’s Accoya?
What’s Accoya?
What’s Accoya?
Accoya is a high-performance modified timber known for exceptional stability, durability, and sustainability.
Made from FSC®-certified wood and enhanced through acetylation process, it stays straight, resists decay, and performs reliably in any climate.
Accreditation
Accreditation
Non-toxic, fully recyclable, and backed by industry-leading warranties, Accoya offers architects and designers a premium timber solution that’s beautiful, long-lasting, and environmentally responsible.
Non-toxic, fully recyclable, and backed by industry-leading warranties, Accoya offers architects and designers a premium timber solution that’s beautiful, long-lasting, and environmentally responsible.
Peace of mind that all Accoya comes from FSC® certified forests.
One of the few building materials certified Cradle to Cradle Gold.
Non toxic and 100% recyclable.
25/50 Years Warranty
25/50 Years Warranty
20 Years In Fresh Water/
50 Years Above Ground
20 Years In Fresh Water/
50 Years Above Ground
Dimensionally Stable
Dimensionally Stable
ISO 4469
ISO 4469
Non-Toxic
C2C Material Health - Platinum
Low Flame Spread & Smoke
Low Flame Spread & Smoke
Class C (NFPA 255 - ASTM E84, UL 723 & UBC 8-1).
Class C (NFPA 255 - ASTM E84, UL 723 & UBC 8-1).
Low Thermal Gain
Low Thermal Gain
ASTM C177 / EN1226: 2001
ASTM C177 / EN1226: 2001
FSC
FSC
Certified sustainable forestry
Certified sustainable forestry
C2C Certified®Full Scope Gold
C2C Certified®Full Scope Gold
Cradle to Cradle Certified®
Cradle to Cradle Certified®
Virtually Termite-Proof
Virtually Termite-Proof
EN 117 amended and EN 118
EN 117 amended and EN 118
SGBC
SGBC
SGBP – Excellent
SGBP – Excellent
25/50 Years Warranty
20 Years In Fresh Water/
50 Years Above Ground
Dimensionally Stable
ISO 4469
Non-Toxic
C2C Material Health - Platinum
Low Flame Spread & Smoke
Class C (NFPA 255 - ASTM E84, UL 723 & UBC 8-1).
Low Thermal Gain
ASTM C177 / EN1226: 2001
FSC
Certified sustainable forestry
C2C Certified®Full Scope Gold
Cradle to Cradle Certified®
Virtually Termite-Proof
EN 117 amended and EN 118
SGBC
SGBP – Excellent
Colours
Colours
Available in: (Colour Customisation Available)
Available in: (Colour Customisation Available)
Mont Blanc
Natural
Glazed
907 Quartz Grey
905 Patina
903 Basalt Grey
Silverwood
727 Rosewood
712 Ebony
707 Walnut
706 Oak
Charred
Ember
729 Fir green
708 Teak
703 Mahogany
Glazed
907 Quartz Grey
905 Patina
903 Basalt Grey
Silverwood
727 Rosewood
712 Ebony
707 Walnut
706 Oak
Charred
Ember
729 Fir green
708 Teak
703 Mahogany
Natural
What is Acetylation?
What is Acetylation?
Acetylation is proven science for modifying wood, permanently transforming the cell structure to create wood that is virtually unaffected by water.
The final product — Accoya comes with a 50-year durability warranty, and boasts accreditations and certifications such as Cradle to Cradle, SGBC, LEED, termite-resistance, and Class 3 fire rating certifications
Acetylation is proven science for modifying wood, permanently transforming the cell structure to create wood that is virtually unaffected by water.
The final product — Accoya comes with a 50-year durability warranty, and boasts accreditations and certifications such as Cradle to Cradle, SGBC, LEED, termite-resistance, and Class 3 fire rating certifications
Accoya Acetylation
Accoya Acetylation
A sustainably consistent supply of durable, non-toxic, and dimensionally stable wood makes it an ideal material for manufacturing high performance exterior timber products such as wood siding, outside decking, cladding, landscape timbers and joinery.
Accoya Key Features
Accoya Key Features
NATURALLY INSULATING
Offers improved insulation in comparison with commonly used hardwood and softwood species
Ideal for applications where energy conservation is important
NATURALLY INSULATING
Offers improved insulation in comparison with commonly used hardwood and softwood species
Ideal for applications where energy conservation is important
NATURALLY INSULATING
Offers improved insulation in comparison with commonly used hardwood and softwood species
Ideal for applications where energy conservation is important
RETAINED STRENGTH & HARDNESS
The process does not compromise the wood’s strength
Hardness is increased
High strength to weight ratio makes it suitable for challenging applications
RETAINED STRENGTH & HARDNESS
The process does not compromise the wood’s strength
Hardness is increased
High strength to weight ratio makes it suitable for challenging applications
RETAINED STRENGTH & HARDNESS
The process does not compromise the wood’s strength
Hardness is increased
High strength to weight ratio makes it suitable for challenging applications
BAREFOOT FRIENDLY
Ideal for all decking situations in extreme temperatures
Low thermal gain
Splinters are much less than other wood species when used for decking
BAREFOOT FRIENDLY
Ideal for all decking situations in extreme temperatures
Low thermal gain
Splinters are much less than other wood species when used for decking
BAREFOOT FRIENDLY
Ideal for all decking situations in extreme temperatures
Low thermal gain
Splinters are much less than other wood species when used for decking
EXCELLENT MACHINABILITY
Easy to machine and process
No special tools are required
EXCELLENT MACHINABILITY
Easy to machine and process
No special tools are required
EXCELLENT MACHINABILITY
Easy to machine and process
No special tools are required
INSECT BARRIER
Indigestible to a wide range of insects, including termites
Greatly reduced vulnerability
INSECT BARRIER
Indigestible to a wide range of insects, including termites
Greatly reduced vulnerability
INSECT BARRIER
Indigestible to a wide range of insects, including termites
Greatly reduced vulnerability
SUSTAINABLE SOURCE
From FSC® and other regionally certified woods
Naturally renewable
SUSTAINABLE SOURCE
From FSC® and other regionally certified woods
Naturally renewable
SUSTAINABLE SOURCE
From FSC® and other regionally certified woods
Naturally renewable
Technical Data
Technical Data
Thermal Gain on Decks
Decking and terraces under the sun is prone to thermal gain, and during the hot summer days, the deck temperature can reach over 65 °C.
Using a thermogram image analysis, Accoya®, was tested long side with three variants of WPC decking.
The ambient temperature of the test site was 32°C.
Accoya®
39 ~ 47°C
Thermally modified wood
47 ~ 51°C
Wood Plastic Composite
53 ~ 57°C
The thermograms indicates Accoya®’s thermal gain is substantially less than the alternatives tested. This makes it truly “barefoot friendly” and resistance to cupping and splintering with prolonged weathering.
Thermal Gain on Decks
INSECT DECAY
Accoya® wood is indigestible to a wide range of pests and an effective barrier to attack. For instance, when tested for termites according to AWPA E1 standards, appearance ratings consistently scored ≥ 9 (Light Attack), whereas the control sample averaged 3.5 (worse than Heavy Attack). Additionally, Accoya® wood exhibited an average weight loss of only 1.43%, compared to the control sample's average of 32.06%.
INSECT DECAY
Accoya® wood is indigestible to a wide range of pests and an effective barrier to attack. For instance, when tested for termites according to AWPA E1 standards, appearance ratings consistently scored ≥ 9 (Light Attack), whereas the control sample averaged 3.5 (worse than Heavy Attack). Additionally, Accoya® wood exhibited an average weight loss of only 1.43%, compared to the control sample's average of 32.06%.
MACHINABILITY
Processing does not affect the unique properties of Accoya® wood, as it is modified throughout and not leachable. It is relatively easy to process and can be compared to profiling a soft wood species. No special tools are required for cross cutting, ripping, planing, routing and drilling. Sanding before finishing is rarely required.
MACHINABILITY
Processing does not affect the unique properties of Accoya® wood, as it is modified throughout and not leachable. It is relatively easy to process and can be compared to profiling a soft wood species. No special tools are required for cross cutting, ripping, planing, routing and drilling. Sanding before finishing is rarely required.
GLUING
Both load bearing and non-load bearing applications have been tested using adhesive systems related to laminating, finger jointing and frame corner joints. While good results can be achieved with most common adhesives, PU, epoxy and PRF adhesives give the best results. The results of gluing with polyvinyl acetate (PVAc) and melamine urea formaldehyde (MUF) can vary greatly. Specific recommendations for your project are available upon request.
GLUING
Both load bearing and non-load bearing applications have been tested using adhesive systems related to laminating, finger jointing and frame corner joints. While good results can be achieved with most common adhesives, PU, epoxy and PRF adhesives give the best results. The results of gluing with polyvinyl acetate (PVAc) and melamine urea formaldehyde (MUF) can vary greatly. Specific recommendations for your project are available upon request.
FINISHING
Most commonly used coating systems can be used on Accoya® wood. Testing has been performed with a full range of oilbased and water-based coating systems. Leading coating manufacturers have found that their products last three or more times longer when used on Accoya® wood. Specific recommendations for your project are available upon request.
FINISHING
Most commonly used coating systems can be used on Accoya® wood. Testing has been performed with a full range of oilbased and water-based coating systems. Leading coating manufacturers have found that their products last three or more times longer when used on Accoya® wood. Specific recommendations for your project are available upon request.
INSECT DECAY
MACHINABILITY
GLUING
FINISHING
Material
100% Solid Accoya® Wood
DURABILITY
EN 113 Class 1 (the highest rating). It is an effective barrier against a broad spectrum of fungi including cellar, wet rot, dry rot, soft rot, white, brown and pore fungi.
Equilibrium Moisture Content
3 – 5 % at 65% relative humidity, 20°C
DENSITY AND SPREAD
65% RH, 20°C, Average 512 kg/m³, Range 432 to 592 kg/m³
Shrinkage
WET – 65% RH, 20°C
Wet – Oven Dry
Radial 0.4%
Radial 0.7%
Tangential 0.8%
Tangential 1.5%
FIRE RATING
Class C (ASTM E84) and D (EN14915). Accoya® wood can be firetreated to meet higher requirements.
THERMAL CONDUCTIVITY
EN 12667, λ = 0.12 W/m∙K
BENDING STRENGTH
EN 408, 40 N/mm²
BENDING STIFFNESS
EN 408, 8800 N/mm²
JANKA HARDNESS
ASTM D143, Side 4100 N, End grain 6600 N
Standard Lengths
Standard Lengths
2.4m, 3.0m, 3.6m, 4.2m, 4.8m
2.4m, 3.0m, 3.6m, 4.2m, 4.8m
Please contact us for stock availability and delivery time.
All dimensions are actual rough sawn.
Accoya® wood is available in many other standard decking sizes and siding patterns from our partners.
Please contact us for stock availability and delivery time.
All dimensions are actual rough sawn.
Accoya® wood is available in many other standard decking sizes and siding patterns from our partners.
A1: 4 sides primarily clear
A2: 3 sides primarily clear
FJ: Finger Jointed
A1: 4 sides primarily clear
A2: 3 sides primarily clear
FJ: Finger Jointed
Other grades and dimensions can be made. Please contact us for more information
Other grades and dimensions can be made. Please contact us for more information
standard dimensions & Grades
standard dimensions & Grades
* Also possible in Finger Jointed (46X95/ 121 / 145 mm) L = 6m
** Only Finger Jointed and laminated (95 X 121/ 145 mm) L = 6m
* Also possible in Finger Jointed (46X95/ 121 / 145 mm) L = 6m
** Only Finger Jointed and laminated (95 X 121/ 145 mm) L = 6m
* Also possible in Finger Jointed (46X95/ 121 / 145 mm) L = 6m
** Only Finger Jointed and laminated (95 X 121/ 145 mm) L = 6m
Resources
Resources
Accoya® Technical data
Accoya® Technical data
Accoya® Warranty Brochure
Accoya® Warranty Brochure
Accoya® Accreditations
Accoya® Accreditations
For additional technical files, including CAD or BIM formats, please get in touch with our team at sales@calvarycarpentry.com
Installation
Installation
Decking Installation Video
Decking Installation Video
Babilou Accoya Dome Installation Video
Babilou Accoya Dome Installation Video
Archifest 2023 Accoya Structure Video
Archifest 2023 Accoya Structure Video
Explore our case studies to see more interesting accoya project.
Our Works
Our Works
Treasure Island
2025
-
Singapore
At Shou Sugi House, Calvary delivered the full timber application—from Shou Sugi Ban cladding to Accoya decking and soffits, alongside Champaca’s arcing ceiling, stairs, and flooring. Set within a lush backdrop, the materials come together in a calm, cohesive dwelling that sits quietly within its tropical waterfront setting.
Treasure Island
2025
-
Singapore
At Shou Sugi House, Calvary delivered the full timber application—from Shou Sugi Ban cladding to Accoya decking and soffits, alongside Champaca’s arcing ceiling, stairs, and flooring. Set within a lush backdrop, the materials come together in a calm, cohesive dwelling that sits quietly within its tropical waterfront setting.
Clavon
2025
-
Clavon
At Clavon Residence, the swimming pool deck is finished with Accoya timber, forming a broad platform connecting seamlessly with the surrounding landscape.
Clavon
2025
-
Clavon
At Clavon Residence, the swimming pool deck is finished with Accoya timber, forming a broad platform connecting seamlessly with the surrounding landscape.
Mandai Rainforest Resort
2025
-
Mandai Wildlife Reserve
Mandai Rainforest Resort – Singapore’s First SLE Resort
Calvary Carpentry crafted the iconic seedpods at Mandai Rainforest Resort using Accoya, a high-performance, sustainable timber. Prioritising non-toxic, green-certified materials, great durability while minimising environmental impact. This project showcases our commitment to eco-friendly innovation and regenerative design. Sustainability with Conservation.
Mandai Rainforest Resort
2025
-
Mandai Wildlife Reserve
Mandai Rainforest Resort – Singapore’s First SLE Resort
Calvary Carpentry crafted the iconic seedpods at Mandai Rainforest Resort using Accoya, a high-performance, sustainable timber. Prioritising non-toxic, green-certified materials, great durability while minimising environmental impact. This project showcases our commitment to eco-friendly innovation and regenerative design. Sustainability with Conservation.
Have more questions?
We’re here to help.
Just send us your enquiry and we will contact you.
MALAYSIA
Level 2, 8, Jalan TS 6/9, Taman Perindustrian Subang, 47510 Subang Jaya, Selangor, Malaysia
© 2026 Calvary Carpentry Pte. Ltd. All Rights Reserved.
Privacy
Have more questions?
We’re here to help.
Just send us your enquiry and we will contact you.
MALAYSIA
Level 2, 8, Jalan TS 6/9, Taman Perindustrian Subang, 47510 Subang Jaya, Selangor, Malaysia
© 2026 Calvary Carpentry Pte. Ltd. All Rights Reserved.
Privacy
Have more questions?
We’re here to help.
Just send us your enquiry and we will contact you.
MALAYSIA
Level 2, 8, Jalan TS 6/9, Taman Perindustrian Subang, 47510 Subang Jaya, Selangor, Malaysia
© 2026 Calvary Carpentry Pte. Ltd. All Rights Reserved.
Privacy
