sauna wood panels (sauna wood boards).
They are tongue-and-groove wooden boards specially made for building sauna or steam room walls and ceilings.
What it’s used for:
Lining sauna rooms
Interior walls & ceiling of steam/sauna cabins
Sauna benches and interiors
Why this wood is special:
Withstands high heat and humidity
Does not overheat easily (safe for skin)
Resistant to warping and cracking
Usually made from spruce, pine, cedar, or hemlock