Picture the wall behind your heater going nearly black, so the stove and the flame are the first thing your eye lands on when you step in. That is what this wood is for. Brushed and waxed to a deep matte black, it turns an ordinary hot room into a smoke-sauna throwback, or a sharp modern contrast against pale thermo-aspen benches.

This is accent wood, not whole-room cladding. Most builds run one black feature wall, or black behind the heater, and let a lighter wood carry the rest. It comes as 1×4 and 1×5 STS4 tongue-and-groove wall cladding in brushed black alder and black thermo-spruce, factory-finished with a natural, sauna-safe wax. That saves you the messy job of blacking boards yourself and gives you an even finish that lasts.

Not sure how much you need, or how to mix it with a lighter wood? Send us your wall dimensions and we will tell you how many boards to order and what pairs well with it. Call or text the shop at (844) 565-1113.

*Free samples available! Select ‘sample’ and ‘free shipping for samples’ under any wood profile.
*Most wood orders qualify for free shipping with any heater purchase.

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    1X4 Black Thermo-Spruce STS4 T&G Wall Cladding – Brushed & Waxed Black Sauna Wood by Thermory

    Price range: $4.27 through $251.00

    The Bold New Statement in Sauna Design

    Introducing Black Thermo-Spruce – the dramatic, sophisticated sauna wood that’s revolutionizing modern sauna aesthetics. This isn’t paint or stain; it’s the natural beauty of spruce transformed through Thermory’s intensive thermal modification process, creating a rich, deep black that’s as durable as it is stunning.

    Wire-brushed to perfection, each board reveals the natural grain patterns that make every installation unique. The textured surface doesn’t just look incredible – it feels amazing under your fingertips, adding a tactile dimension to your sauna experience. Finally, a true black sauna wood at a price that makes sense.

    Select options This product has multiple variants. The options may be chosen on the product page

    1X5 Brushed Black Alder STS4 Wall Cladding – Sauna Wood by Thermory

    Price range: $6.52 through $391.20

    Looking for a smooth, black sauna wood with a professional finish?  The wire-brushed black wax alder by Thermory is a perfect choice for a durable finish.  Whether contrasting with woods like thermo-aspen or going all dark for the ancient ‘smoke sauna’ look this STS4 1×5 is an ideal choice for a wide plank wall and ceiling cladding.  Actual wall coverage is 4.4″.

    Note: Brushed black alder does NOT have the burnt Shou Sugi Ban (yakisugi) look as other websites incorrectly show.  Please ask us about ‘Thermory Ignite’ for that.

    Select options This product has multiple variants. The options may be chosen on the product page