Thermowood vs. Natural Wood: What's the Real Difference, and Which One Wins Where?

Many customers assume "thermowood" is a separate species, like oak or pine. In reality, thermowood is the same natural wood — simply remade through high heat. The real question isn't which one is better, but which one makes sense for a specific part of your project.

What exactly is the thermowood process?

In the "Thermal Modification" process, wood is heated in an oxygen-free environment to roughly 180-212°C (356-414°F) — with no chemicals involved. This heat changes the wood's cellular structure: the natural moisture-absorbing sugars break down, the wood's color shifts from core to surface into a uniform dark brown, and its capacity to absorb water drops sharply. The technology was originally developed for the cold, humid climate of Northern Europe, where the main goal is resisting decay caused by constant moisture.

The real difference from raw natural wood

• Moisture and decay resistance: thermowood holds up several times better against water and fungus
• Dimensional stability: less warping, less seasonal expansion and contraction
• A uniform dark brown color, unlike raw wood, whose color depends on the species
• Higher price due to the cost of the heat-treatment process
• Slightly lower bending strength — not suited for structural or load-bearing uses

Thermowood prepares wood for the outdoors; raw wood holds up better indoors.

Which one, and where in your project?

For deck flooring, exterior cladding, open roof terraces, and anywhere wood faces rain and ambient humidity directly, thermowood is the more logical choice — for the terrace application specifically, see our thermowood deck flooring guide. But for furniture, cabinets, doors, and anywhere the wood's natural color and structural strength matter, properly finished raw wood is still the better pick. If you're not sure which fits your project, get advice from Choobe Sabz workshop services.

Long-term care for each

Thermowood doesn't need periodic treatment against decay, but to keep its original brown color (and slow the natural graying that comes from sun exposure) it's worth applying a UV-protective oil every one to two years. Raw natural wood left outdoors unfinished both absorbs moisture and loses its color faster; that's also why the wood moisture standard matters before fabrication — we cover that standard and why it matters in our wood moisture article. At Choobe Sabz workshop, we walk customers through both options based on the end use and project budget, so the right choice gets made once, for good.