Home / Wood Compare / ThermoWood Pine Thermo-D vs Thermally Modified Larch
Professional Comparison · Source-attributed engineering data · Updated 19 July 2026
ThermoWood Pine Thermo-D VS Thermally Modified Larch
Which wood is better for your project? Scores are computed from the verified figures on each species page — how we score.
Verdict: near-tie. The right choice depends on the application — see winner by category below.
🥇
ThermoWood Pine Thermo-D
32/100 Library Score
🌲Softwood🌧Outdoor
- Leads on lightness, machining ease, hardness — a narrow but consistent edge
🥈
Thermally Modified Larch
31/100 Library Score
🌲Softwood🌧Outdoor
- Close second across most categories
- Solid choice where its profile fits the project
Visual comparison
ThermoWood Pine Thermo-DThermally Modified Larch
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 Pine Thermo-D |
| Strength (MOR) | Thermally Modified Larch |
| Stiffness (MOE) | Thermally Modified Larch |
| Flame spread | Tie |
| Machining ease | ThermoWood Pine Thermo-D |
| Lightness | ThermoWood Pine Thermo-D |
Engineering data
| Property | ThermoWood Pine Thermo-D | Thermally Modified Larch |
|---|---|---|
| Janka Hardness | 540UNV lbf | 530UNV lbf |
| Density | 0.42ITWA g/cm³ | 0.55ITWA g/cm³ |
| MOE | 9.3ITWA GPa | 11.0ITWA GPa |
| MOR | 38.1ITWA MPa | 75.0ITWA MPa |
| Durability | Class 2 Durable (treated) | Class 2 Durable (treated) |
| Stability | Moderate | Moderate |
| Fire (E84) | Not classified | Not classified |
| Radial Shrink | 1.2ITWA % | 1.3ITWA % |
| Tangential Shrink | 2.5ITWA % | 2.8ITWA % |
| T/R Ratio | 2.08 | 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 Pine Thermo-D | ★★★☆☆ |
| Exterior cladding | 🥇 ThermoWood Pine Thermo-D | ★★★☆☆ |
| Flooring / wear surfaces | 🥇 ThermoWood Pine Thermo-D | ★★☆☆☆ |
| Furniture / interior joinery | 🥇 ThermoWood Pine Thermo-D | ★★★☆☆ |
| Structural / load-bearing | 🥇 Thermally Modified Larch | ★★☆☆☆ |
Advantages & limitations
ThermoWood Pine Thermo-D
Advantages relative to Thermally Modified Larch
Limitations relative to Thermally Modified Larch
- MOR is 38.1 MPa vs 75 MPa, about 49% lower
- MOE is 9.3 GPa vs 11.0 GPa, about 15% lower
Thermally Modified Larch
Advantages relative to ThermoWood Pine Thermo-D
- MOR is 75 MPa vs 38.1 MPa, about 97% higher
- MOE is 11.0 GPa vs 9.3 GPa, about 18% higher
Limitations relative to ThermoWood Pine Thermo-D
Recommendation
Choose ThermoWood Pine Thermo-D if…
- Saunas (a signature use — low thermal conductivity and no resin bleed after modification) and rain screens where the modified profile matches the specification regardless of the strength gap
- Exterior cladding and garden structures where cost or the lighter softwood profile is acceptable and the piece will not see hard structural loading
Choose Thermally Modified Larch if…
- Exterior cladding and rain screens, decking, garden structures where the higher bending strength and stiffness matter in specification
- Interior panelling and flooring where the stiffer thermally modified profile is what the piece needs
Frequently asked questions
Which is more durable, ThermoWood Pine Thermo-D or Thermally Modified Larch?
Neither — both carry the same EN 350 rating (Class 2, Durable (treated)). Outdoors, movement will not separate them either — 2.5% against 2.8% tangential. The practical difference is weight: Thermally Modified Larch runs 0.55 g/cm³ against 0.42, so ThermoWood Pine Thermo-D is the easier fix overhead and the cheaper one to freight.
Which wood is better for outdoor use?
Both are EN 350 Class 2, and tangential movement runs 2.5% for ThermoWood Pine Thermo-D against 2.8% for Thermally Modified Larch — close enough that decay resistance will not choose between them, and ThermoWood Pine Thermo-D holds its dimension marginally better. Hardness is effectively level (540 vs 530 lbf), so choose on weight.
Is ThermoWood Pine Thermo-D harder than Thermally Modified Larch?
Yes — Janka 540 lbf vs 530 lbf.
How we score. The Library Scores are percentile ranks against the other 59 species we cover — durability and stability carry the most weight, and no price data enters the calculation. Full weighting and what it excludes.
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