Wood option: Nordic Spruce

FSC-certified Nordic Spruce, thermally modified for stability and rot resistance and carbonized to a deep charcoal through the full thickness, with a mild scent.

Nordic Spruce is sourced from Norway and certified by the Forest Stewardship Council (FSC). The wood is thermally modified, which means it's heat-treated at high temperatures to alter its physical properties without using chemicals.

Treatment process

Thermal modification heats the wood in a controlled chamber to temperatures around 392°F / 200°C. The high heat changes the cell structure, reducing the wood's tendency to absorb moisture, increasing its dimensional stability, and improving rot resistance. The process produces no chemical residues.

Color

Deep charcoal that runs through the full thickness of every board, not a surface stain. It holds its colour outdoors longer than stained dark wood; the matte finish softens slightly after years of sun, and a sauna-safe wood oil keeps it deep.

Aroma when heated

Mild, clean, slightly sweet. Milder than Japanese Cedar.

Thermal behavior

Low thermal conductivity, which keeps the wood surface comfortable to touch even at high cabin temperatures. The benches don't burn.

Durability

The thermal modification provides built-in rot resistance. The wood is dimensionally stable through repeated heat cycling, which is the primary stress on sauna timber.

Best for

Buyers who want a deep charcoal, architectural look. Suitable for all climates.