Thermo Wood • 2026 Sauna Trend

With all these benefits, it’s clear why more builders are turning to thermo wood as their material of choice for sauna construction.

The Sauna Material Trend Taking Over in 2026

For decades, sauna builders relied on the same familiar woods because that’s what was available and affordable. But in 2026, a clear shift is happening—builders, designers, and serious DIYers are moving toward thermo wood because it performs better, lasts longer, and creates a cleaner sauna experience.

If you’ve found yourself searching “what is thermo wood?” you’re not alone. It’s one of the most common questions we’re getting right now from people planning new sauna builds.

What is thermo wood?

Thermo wood is real wood that has been upgraded using a natural thermal modification process. Instead of chemicals or pressure treatments, the wood is exposed to high heat and steam in a controlled environment. This permanently improves how the wood handles heat and humidity—making it more stable and better suited for sauna conditions.