Home / Wood Compare / Thermowood Ash ThermoD vs Thermowood Pine ThermoD
Professional Comparison · Verified Engineering Data · Updated 19 July 2026
Thermowood Ash ThermoD VS Thermowood Pine ThermoD
Which wood is better for your project? Scores are computed from the verified figures on each species page — how we score.
🥇
Thermowood Ash ThermoD
56/100 Library Score
🪵Hardwood🌧Outdoor💧Moisture Stable
- Better dimensional stability (Good vs Moderate)
- Harder wear surface (Janka 1320 vs 540 lbf)
- Stronger in bending (MOR 90.0 vs 65.0 MPa)
🥈
Thermowood Pine ThermoD
32/100 Library Score
🌲Softwood🌧Outdoor
- Easier to machine and fasten
- Lighter (0.48 vs 0.66 g/cm³)
- Solid choice where its profile fits the project
Visual comparison
Thermowood Ash ThermoDThermowood Pine ThermoD
Winner by category
There isn't one universally best wood — there's a best wood for each purpose.
| Category | Winner |
|---|---|
| Durability | Tie |
| Stability | Thermowood Ash ThermoD |
| Hardness | Thermowood Ash ThermoD |
| Strength (MOR) | Thermowood Ash ThermoD |
| Stiffness (MOE) | Thermowood Ash ThermoD |
| Flame spread | Tie |
| Machining ease | Thermowood Pine ThermoD |
| Lightness | Thermowood Pine ThermoD |
Engineering data
| Property | Thermowood Ash ThermoD | Thermowood Pine ThermoD |
|---|---|---|
| Janka Hardness | 1320ITWA lbf | 540ITWA lbf |
| Density | 0.66ITWA g/cm³ | 0.48ITWA g/cm³ |
| MOE | 11.5ITWA GPa | 9.5ITWA GPa |
| MOR | 90.0ITWA MPa | 65.0ITWA MPa |
| Durability | Class 2 Durable (treated) | Class 2 Durable (treated) |
| Stability | Good | Moderate |
| Fire (E84) | Class C indicative | Class C indicative |
| Radial Shrink | 1.7ITWA % | 1.2ITWA % |
| Tangential Shrink | 3.2ITWA % | 2.5ITWA % |
| T/R Ratio | 1.88 | 2.08 |
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 | 🥇 Thermowood Ash ThermoD | ★★★★☆ |
| Exterior cladding | 🥇 Thermowood Pine ThermoD | ★★★☆☆ |
| Flooring / wear surfaces | 🥇 Thermowood Ash ThermoD | ★★★☆☆ |
| Furniture / interior joinery | 🥇 Thermowood Pine ThermoD | ★★★☆☆ |
| Structural / load-bearing | 🥇 Thermowood Ash ThermoD | ★★☆☆☆ |
| Sauna / wet interiors | 🥇 Thermowood Ash ThermoD | ★★★★☆ |
Advantages & limitations
Thermowood Ash ThermoD
Advantages
- Rated for exterior exposure (EN 350 Class 2)
Limitations
- Few practical drawbacks within its intended uses
Thermowood 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 Thermowood Ash ThermoD if…
- You need minimal movement (doors, decking, panelling)
- The surface takes traffic or impact
Choose Thermowood Pine ThermoD if…
- Ease of working and fastening matters
- Weight matters — ceilings, wall panels, transport
- Its profile matches the application better than a single overall score
Frequently asked questions
Which is more durable, Thermowood Ash ThermoD or Thermowood Pine ThermoD?
Neither — both carry the same EN 350 rating (Class 2, Durable (treated)). For outdoor decisions between them, weigh dimensional stability and hardness instead.
Which wood is better for outdoor use?
Thermowood Ash ThermoD — outdoor performance combines decay durability with dimensional stability, and it leads on that combination.
Is Thermowood Ash ThermoD harder than Thermowood Pine ThermoD?
Yes — Janka 1320 lbf vs 540 lbf.
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.
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