Home / Wood Compare / Thermowood Siberian Larch ThermoD vs Thermowood Larch ThermoD
Professional Comparison · Verified Engineering Data · Updated 19 July 2026
Thermowood Siberian Larch ThermoD VS Thermowood Larch 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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Thermowood Siberian Larch ThermoD
38/100 Library Score
🌲Softwood🌧Outdoor
- Harder wear surface (Janka 1100 vs 530 lbf)
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Thermowood Larch ThermoD
31/100 Library Score
🌲Softwood🌧Outdoor
- Easier to machine and fasten
- Lighter (0.55 vs 0.59 g/cm³)
- Solid choice where its profile fits the project
Visual comparison
Thermowood Siberian Larch ThermoDThermowood Larch ThermoD
Winner by category
There isn't one universally best wood — there's a best wood for each purpose.
| Category | Winner |
|---|---|
| Durability | Tie |
| Stability | Tie |
| Hardness | Thermowood Siberian Larch ThermoD |
| Strength (MOR) | Thermowood Siberian Larch ThermoD |
| Stiffness (MOE) | Thermowood Siberian Larch ThermoD |
| Flame spread | Tie |
| Machining ease | Thermowood Larch ThermoD |
| Lightness | Thermowood Larch ThermoD |
Engineering data
| Property | Thermowood Siberian Larch ThermoD | Thermowood Larch ThermoD |
|---|---|---|
| Janka Hardness | 1100ITWA lbf | 530ITWA lbf |
| Density | 0.59ITWA g/cm³ | 0.55ITWA g/cm³ |
| MOE | 11.5ITWA GPa | 11.0ITWA GPa |
| MOR | 78.0ITWA MPa | 75.0ITWA MPa |
| Durability | Class 2 Durable (treated) | Class 2 Durable (treated) |
| Stability | Moderate | Moderate |
| Fire (E84) | Class C indicative | Class C indicative |
| Radial Shrink | 1.4ITWA % | 1.3ITWA % |
| Tangential Shrink | 2.9ITWA % | 2.8ITWA % |
| T/R Ratio | 2.07 | 2.15 |
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 Siberian Larch ThermoD | ★★★☆☆ |
| Exterior cladding | 🥇 Thermowood Larch ThermoD | ★★★☆☆ |
| Flooring / wear surfaces | 🥇 Thermowood Siberian Larch ThermoD | ★★☆☆☆ |
| Furniture / interior joinery | 🥇 Thermowood Larch ThermoD | ★★★☆☆ |
| Structural / load-bearing | 🥇 Thermowood Siberian Larch ThermoD | ★★☆☆☆ |
Advantages & limitations
Thermowood Siberian Larch ThermoD
Advantages
- Rated for exterior exposure (EN 350 Class 2)
Limitations
- Noticeable seasonal movement — allow for it in design
Thermowood Larch ThermoD
Advantages
- Rated for exterior exposure (EN 350 Class 2)
- Easy to machine, glue and fasten
Limitations
- Noticeable seasonal movement — allow for it in design
- Soft surface — dents under point loads
Recommendation
Choose Thermowood Siberian Larch ThermoD if…
- The surface takes traffic or impact
Choose Thermowood Larch 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 Siberian Larch ThermoD or Thermowood Larch 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?
They are closely matched outdoors — durability and stability come out almost level. Let the application decide: harder surface for decking traffic, lighter weight for cladding.
Is Thermowood Siberian Larch ThermoD harder than Thermowood Larch ThermoD?
Yes — Janka 1100 lbf vs 530 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.