Profiles · 19–50 mm
Timber — indicative fig. O·14
Fire Class D Class DEmbodied carbon 0.39kgCO₂e/kg LowCompressive 35-45MPa StructuralDesign life 60yr
Chemically modified Radiata Pine achieving Class 1 durability through acetylation. 80% reduction in moisture uptake, exceptional dimensional stability (0.4-0.8% shrinkage), 50-year warranty. Non-toxic, FSC-certified, suitable for cladding, decking, windows, and marine applications.
01 Physical
Density 512 (432-592 range)kg/m3
Specific gravity 0.51 (0.43-0.59 range)
Porosity 3-5 (EMC at 65% RH)%
Water absorption 3-5 (EMC)%
Hardness 4.1 (side) / 6.6 (end)kN
UV resistance Good (with coatings lasting 2-3x longer than on untreated wood)
Chemical resistance Excellent
pH tolerance 3-9pH
02 Mechanical
Tensile strength 40-60MPa
Compressive strength 35-45MPa
Flexural strength 39-40MPa
Impact resistance 25-40J/m
Creep resistance Excellent
03 Thermal
Thermal conductivity 0.108-0.12W/mK
Specific heat 1300-1600J/kgK
Thermal expansion 0.003-0.005mm/mK
04 Compliance & Fire First question
Combustibility class Class D (EN) / Class C (ASTM)
Fire resistance level 30-45 (thickness dependent)minutes
Ignition temp 280-350degC
Flame spread index Class C (ASTM E84)FSI
Smoke dev. index 200-350SDI
Heat release rate 180-300kW/m2
05 Sustainability & Health
Embodied carbon 200-500 (process dependent, before biogenic offset)kg CO2-eq/m3
Carbon footprint -50 to 300 (accounting dependent)kg CO2-eq/m3
Embodied energy 1200-2000MJ/m3
Water footprint 60-150L/kg
Recyclability 100%
Recycled content 0%
Renewable content 100%
Circular score 7.5/10
VOC emissions <20 (cured, excluding initial vinegar odour)ug/m3
Toxicity rating Non-toxic — food-grade chemistry
LEED contribution 5-8points
06 Durability · Cost · Logistics
Expected lifespan 60+years
Maintenance interval 8-12years
Warranty period 50 (above ground) / 25 (in-ground)years
Material cost (range) 150-300 (estimated, quote-based)AUD/m2
Material cost (per unit) 6000-15000 (estimated)AUD/m3
Lead time 14-56days
Lifecycle cost 150-350AUD/m2
Annual maintenance 1-3AUD/m2/year
Market availability Good — national distribution through Britton Timbers + regional stockists
07 Assessment
Advantages
- 50-year above-ground and 25-year in-ground warranty
- Class 1 durability (EN 350) — surpasses Teak and Ironbark for rot resistance
- Exceptional dimensional stability — 80% reduction in moisture uptake
- 100% non-toxic — no biocides, no harmful chemicals, no toxic leaching
- FSC-certified sustainably sourced Radiata Pine
- Excellent machinability — works like natural timber
- Termite resistant (AWPA E1 rating >=9)
- Suitable for marine/coastal applications including salt water splash zones
- Through-core modification — cut ends perform identically to faces
- Available in natural and Color Grey (through-core stain) finishes
Constraints
- Premium pricing — significantly more expensive than untreated timber (quote-based in Australia)
- Imported product — manufactured in Netherlands, longer lead times
- Softwood base — Janka 4.1 kN, softer than Australian hardwoods
- Acetic acid (vinegar) odour during initial weathering period
- Higher embodied energy than untreated timber due to acetylation process
- Requires stainless steel or Accoya-approved fixings
- Fire rating Class D (EN) / Class C (ASTM) — combustible, may not meet BAL-29
- Limited to Radiata Pine base — no species selection options
08 Applications
A1 External window and door frames Superior thermal insulation (lambda 0.108 W/mK) and 50-year warranty for window and door frames
A2 High-performance cladding systems External cladding with exceptional dimensional stability and 50-year warranty
A3 Marine and coastal construction Salt water splash zone warranted, 25-year in-ground warranty for coastal environments
A4 Premium decking and outdoor furniture 25-year in-ground warranty decking, non-toxic outdoor furniture and seating
A5 Structural millwork and joinery Complex joinery benefiting from through-core modification — cut ends perform as well as faces
A6 Commercial and residential exteriors Premium facade material with natural or Color Grey finish options
A7 Heritage restoration projects Dimensionally stable substrate for replicating period timber details
A8 Extreme climate applications Proven performance from subarctic to tropical environments worldwide
09 Sources & Standards
References
- Environmental Product Declaration — Accoya Wood (EN 15804+A2, Cradle-to-Gate, A1-A3) · manufacturer
- Environmental Product Declaration — Accoya Decking (EN 15804+A2, Cradle-to-Grave) · manufacturer
- Accoya Wood Information Guide V3.9.1 · manufacturer
- Accoya Australia / NZ Technical Data Sheet (Mathews Timber distributor) · manufacturer
- AS 5604:2022 — Timber: Natural durability ratings · standard
- AS 3959:2018 — Construction of buildings in bushfire-prone areas · standard
- WoodSolutions Technical Design Guide 04 — Building with Timber in Bushfire-prone Areas · industry
- WoodSolutions BAL Bushfire Calculator V2.1 · industry
- Rowell, Ibach, McSweeny & Nilsson (2009) — Understanding decay resistance, dimensional stability and strength changes in heat-treated and acetylated wood · research
- Rowell (2021) — USDA Forest Service Forest Products Laboratory: Acetylation of Wood 1945–1966 · research
- Accoya — Cradle to Cradle Certified Gold (Material Health Platinum) · manufacturer