Home / Wood Compare / Accoya Acetylated Radiata Pine vs Thermowood Radiata Pine ThermoD
Professional Comparison · Verified Engineering Data · Updated 19 July 2026
Accoya Acetylated Radiata Pine VS Thermowood Radiata Pine ThermoD
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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Accoya Acetylated Radiata Pine
68/100 Library Score
🌲Softwood🌧Outdoor💧Moisture Stable🌿Sustainable
- Higher durability (EN 350 Class 1 vs Class 2)
- Better dimensional stability (Exceptional vs Moderate)
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Thermowood Radiata Pine ThermoD
19/100 Library Score
🌲Softwood🌧Outdoor🌿Sustainable
- Close second across most categories
- Solid choice where its profile fits the project
Visual comparison
Accoya Acetylated Radiata PineThermowood Radiata Pine ThermoD
Winner by category
There isn't one universally best wood — there's a best wood for each purpose.
| Category | Winner |
|---|---|
| Durability | Accoya Acetylated Radiata Pine |
| Stability | Accoya Acetylated Radiata Pine |
| Hardness | Tie |
| Strength (MOR) | Tie |
| Stiffness (MOE) | Thermowood Radiata Pine ThermoD |
| Flame spread | Tie |
| Machining ease | Tie |
| Lightness | Thermowood Radiata Pine ThermoD |
Engineering data
| Property | Accoya Acetylated Radiata Pine | Thermowood Radiata Pine ThermoD |
|---|---|---|
| Janka Hardness | 710 lbf | 710ITWA lbf |
| Density | 0.51 g/cm³ | 0.5ITWA g/cm³ |
| MOE | 8.5 GPa | 9.0ITWA GPa |
| MOR | 60.0 MPa | 62.0ITWA MPa |
| Durability | Class 1 Very Durable (treated) | Class 2 Durable (treated) |
| Stability | Exceptional | Moderate |
| Fire (E84) | Class C indicative | Class C indicative |
| Radial Shrink | 0.7 % | 1.2ITWA % |
| Tangential Shrink | 1.5 % | 2.6ITWA % |
| T/R Ratio | 2.14 | 2.17 |
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 | 🥇 Accoya Acetylated Radiata Pine | ★★★☆☆ |
| Furniture / interior joinery | 🥇 Accoya Acetylated Radiata Pine | ★★★★☆ |
| Structural / load-bearing | 🥇 Thermowood Radiata Pine ThermoD | ★☆☆☆☆ |
| Sauna / wet interiors | 🥇 Accoya Acetylated Radiata Pine | ★★★★★ |
Advantages & limitations
Accoya Acetylated Radiata Pine
Advantages
- Rated for exterior exposure (EN 350 Class 1)
- Very low movement in service
Limitations
- Soft surface — dents under point loads
Thermowood Radiata Pine ThermoD
Advantages
- Rated for exterior exposure (EN 350 Class 2)
- Easy to machine, glue and fasten
- Lightweight — easy handling and installation
Limitations
- Noticeable seasonal movement — allow for it in design
- Soft surface — dents under point loads
Recommendation
Choose Accoya Acetylated Radiata Pine if…
- The project lives outdoors and service life is the priority
- You need minimal movement (doors, decking, panelling)
Choose Thermowood Radiata Pine ThermoD if…
- Its profile matches the application better than a single overall score
Frequently asked questions
Which is more durable, Accoya Acetylated Radiata Pine or Thermowood Radiata Pine ThermoD?
Accoya Acetylated Radiata Pine — it carries the better EN 350 rating (Class 1 vs Class 2). Lower class numbers mean higher natural durability.
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 Accoya Acetylated Radiata Pine harder than Thermowood Radiata Pine ThermoD?
They measure the same on the Janka scale (710 lbf each) — effectively equal in surface hardness.
How we score. Each wood gets a weighted composite of the verified figures shown above: durability 22%, stability 18%, hardness 12%, bending strength 12%, machining ease 12%, stiffness 8%, flame spread 8%, lightness 8%. The Library Score is that composite's percentile rank within our 60-species library — 50 means the library median, 90 means it outperforms nine of every ten species we cover. No price data is scored — cost guidance is qualitative. The score summarises the data; it does not replace judgement about your specific application.