Thermowood saunas with Hot Tub

Why Thermally Modified Wood is a Good Choice for Sauna/Hot Tub Construction

1. Excellent Material Stability in Heat and Humidity

Thermally modified wood (often called “Thermowood”) undergoes a heat treatment process that alters its cell structure. For example, one supplier states that this wood is significantly more resistant to warping and therefore more durable than untreated wood in sauna/hot tub environments.

2. Reduced Moisture Absorption / Improved Resistance to Fungi/Mold

Thermally modified wood absorbs significantly less moisture than untreated softwood and is less susceptible to mold or rot. In a hotel setting, where saunas/hot tubs are used more intensively and humidity cycles are more frequent, this minimizes maintenance costs and downtime.

3. Aesthetics and Wellness Atmosphere

The heat treatment gives thermally modified wood a deeper, more uniform color, beautiful grain patterns, and a higher-quality appearance, which is highly valued in a wellness context. This plays a major role in the hotel spa area: guests associate it visually and haptically with quality and well-being.

4. More environmentally friendly and lower maintenance

The thermal modification process is generally carried out without chemical additives – making the material “greener.” In the long run, this means less replacement, less refurbishment – ​​and therefore lower life cycle costs.

5. Comfort and safety for guests

Wood, especially thermally modified wood, remains more pleasant to the touch in saunas or hot tubs – less “burning hot,” hardly any resin seepage (typical of softwoods), and a more comfortable surface for bare skin. In hotels, this is a plus for guest comfort and safety.

Fewer repairs, better ROI.