European Thermo Aspen Cladding STP

Our Thermo Aspen interior cladding boards are premium European timber, thermally modified using only heat and steam—no chemicals—to enhance stability, durability, and appearance in sauna environments.

Featuring the STP profile, a specialised cladding system widely used in sauna walls and ceilings, it is defined by rounded edges and narrow V-shaped tongue-and-groove joints, creating a smooth, continuous surface with a subtle shadow-lined finish.

The thermal process permanently refines the wood’s cellular structure, improving dimensional stability and resistance to warping, twisting, and moisture movement, ensuring long-lasting performance in high heat and humidity.

Naturally pale in its original form, the aspen is transformed through heat treatment into a warm, golden-brown timber with soft tonal depth, adding warmth and a premium aesthetic to sauna interiors.