Home / Wood Compare / Iroko vs Accoya Acetylated Radiata Pine
Professional Comparison · Source-attributed engineering data · Updated 19 July 2026
Iroko VS Accoya Acetylated Radiata Pine
Which wood is better for your project? Scores are computed from the verified figures on each species page — how we score.
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Iroko
82/100 Library Score
🪵Hardwood🌧Outdoor💧Moisture Stable
- Harder wear surface (Janka 1260 vs 710 lbf)
- Stronger in bending (MOR 85.5 vs 60.0 MPa)
- Better flame-spread class (Class B vs Class C)
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Accoya Acetylated Radiata Pine
68/100 Library Score
🌲Softwood🌧Outdoor💧Moisture Stable🌿Sustainable
- Easier to machine and fasten
- Lighter (0.51 vs 0.55 g/cm³)
- More stable in service
- Solid choice where its profile fits the project
Visual comparison
IrokoAccoya Acetylated Radiata Pine
Winner by category
There isn't one universally best wood — there's a best wood for each purpose.
| Category | Winner |
|---|---|
| Durability | Tie |
| Stability | Accoya Acetylated Radiata Pine |
| Hardness | Iroko |
| Strength (MOR) | Iroko |
| Stiffness (MOE) | Iroko |
| Flame spread | Iroko |
| Machining ease | Accoya Acetylated Radiata Pine |
| Lightness | Accoya Acetylated Radiata Pine |
Engineering data
| Property | Iroko | Accoya Acetylated Radiata Pine |
|---|---|---|
| Janka Hardness | 1260WD lbf | 710 lbf |
| Density | 0.55FPL g/cm³ | 0.51 g/cm³ |
| MOE | 10.1FPL GPa | 8.5 GPa |
| MOR | 85.5FPL MPa | 60.0 MPa |
| Durability | Class 1 Very Durable | Class 1 Very Durable (treated) |
| Stability | Excellent | Exceptional |
| Fire (E84) | Class B indicative | Not classified |
| Radial Shrink | 2.8WD % | 0.7 % |
| Tangential Shrink | 3.8WD % | 1.5 % |
| T/R Ratio | 1.36 | 2.14 |
Figures carry the same source status as the species pages they come from — verified where cited, indicative where marked.
Best for
| Application | Recommended | Suitability |
|---|---|---|
| Outdoor decking / pergola | 🥇 Accoya Acetylated Radiata Pine | ★★★★★ |
| Exterior cladding | 🥇 Accoya Acetylated Radiata Pine | ★★★★★ |
| Flooring / wear surfaces | 🥇 Iroko | ★★★★☆ |
| Furniture / interior joinery | 🥇 Accoya Acetylated Radiata Pine | ★★★★☆ |
| Structural / load-bearing | 🥇 Iroko | ★★☆☆☆ |
| Sauna / wet interiors | 🥇 Accoya Acetylated Radiata Pine | ★★★★★ |
Advantages & limitations
Iroko
Advantages relative to Accoya Acetylated Radiata Pine
- Janka is 1,260 lbf vs 710 lbf, about 77% harder
- MOR is 85.5 MPa vs 60 MPa, about 42% higher
- MOE is 10.1 GPa vs 8.5 GPa, about 19% higher
- Fire (E84) is Class B vs Not classified — a rated flame-spread classification
Limitations relative to Accoya Acetylated Radiata Pine
Accoya Acetylated Radiata Pine
Advantages relative to Iroko
Limitations relative to Iroko
- Janka is 710 lbf vs 1,260 lbf, about 44% lower
- MOR is 60 MPa vs 85.5 MPa, about 30% lower
- MOE is 8.5 GPa vs 10.1 GPa, about 16% lower
- Fire (E84) is Not classified vs Class B — no rated flame-spread classification
Recommendation
Choose Iroko if…
- Exterior and structural joinery — beams, frames, flooring, parquet, panelling — where the higher hardness, bending strength and Class B fire class all matter in specification
- Boat decks, marine and port work, furniture and truck bodies where the harder, stiffer natural exterior hardwood is what the project needs
Choose Accoya Acetylated Radiata Pine if…
- Exterior windows and doors (the timber's flagship application) where dimensional stability from acetylation is the deciding property rather than raw strength or hardness
- Wide-board cladding and rainscreens where the modified stability enables board widths beyond the usual softwood limit and Class 1 durability shared with Iroko is the shared exterior baseline
Frequently asked questions
Which is more durable, Iroko or Accoya Acetylated Radiata Pine?
Neither — both carry the same EN 350 rating (Class 1, Very Durable). For outdoor work the separation is movement, not decay: Accoya Acetylated Radiata Pine moves 1.5% tangentially against 3.8%, which decides board width and fixing spacing more than the durability class does.
Which wood is better for outdoor use?
Accoya Acetylated Radiata Pine — outdoor performance combines decay durability with dimensional stability, and it leads on that combination.
Is Iroko harder than Accoya Acetylated Radiata Pine?
Yes — Janka 1260 lbf vs 710 lbf.
How we score. Scores shown are percentile ranks within our library, weighted towards durability and dimensional stability. They shortlist; they do not decide. Full weighting and what it excludes.