thermo alder

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Thermo alder is alder wood that has undergone thermal modification at high temperatures without the use of chemical additives. As a result, the wood gains a more stable structure, reduced moisture absorption, and a deep, rich tone.

Thermo alder combines the natural texture of alder with enhanced resistance to temperature and humidity fluctuations, making it a popular choice for modern sauna interiors.

The treatment is performed at temperatures up to 200–220 °C in a low-oxygen environment. As a result:

• Hygroscopicity is reduced
• Dimensional stability is increased
• Sensitivity to humidity fluctuations decreases
• Natural color and grain are intensified

The material remains eco-friendly — modification occurs through heat and steam only.

Enhanced Dimensional Stability

Less prone to warping and cracking.

Reduced Moisture Absorption

Better performance in humid sauna environments.

Low Thermal Conductivity

The surface remains comfortable even at high temperatures.

Deep Chocolate Tone

Color becomes darker and more uniform throughout the thickness.

Expressive Grain

The pronounced fiber pattern creates a premium interior appearance.

Thermo alder cladding is used for:

• Steam room wall and ceiling finishes
• Warm, contrast-rich interiors
• Spa zones and humid environments

We offer Grade A thermo alder — knot-free, with precise STS and STP profiles. STS creates a distinct shadow line and modern rhythm. STP forms a calmer and more classic visual effect.

Thermo alder benches are suitable for intensive use thanks to:

• Enhanced stability
• Resistance to temperature and humidity fluctuations
• Comfortable thermal conductivity
• Refined dark tone

Thick boards ensure structural strength and reliability for daily use.

• Steam room cladding
• Benches and loungers
• Contrast sauna interiors
• Modern spa environments