Dark thermo-alder is alder taken deeper into the kiln: chocolate brown with no stain. Same stability and warm scent as thermo-alder. Use it behind the heater, on one wall, or for the whole interior. Tongue and groove wall boards and eased-edge bench boards from Thermory.

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    Dark Thermo-Alder Wall Paneling 1×5 STS4 – Intense Thermal Modification Sauna Wood by Thermory

    $6.87 per linear footFree samples available

    Thermal modification darkens wood, and intense thermal modification darkens wood even more. It also takes the benefits of thermal modification to the next level.

    Wide plank 1×5 thermo-alder is an exceptional sauna wall material that can be installed vertically or horizontally. The natural brown tone provides a classic, upscale sauna look. Thermally modified alder is one of the best-performing sauna woods, with a warm tone, unbeatable performance, and timeless appeal. The minimal expansion and contraction of Dark Thermo-Alder allows for tight transitions without molding.

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

    Dark Thermo-Alder 5/4×4 SHP Bench, Backrest, and Skirt Sauna Wood – Intense Modification by Thermory

    $5.88 per linear footFree samples available

    Dark Thermo-Alder 5/4 SHP Bench material is a perfect choice for sturdy, warm-tone benches that are smooth to the touch. This dark-tone thermo-aspen is more brown and woodsy looking than thermo-aspen. Ideal for a more traditional sauna or cottage feel.

    5/4×4 Bench Boards are an easy and low-cost way to build a premium sauna bench framed with standard 2x4s and decked with these 1.1″ thick boards horizontally or vertically. See below for our framing suggestion.

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

    Dark Thermo-Alder Wall Paneling 1×4 STS4 – Intense Thermal Modification Sauna Wood by Thermory

    $4.25 per linear footFree samples available

    Thermal modification darkens wood, and intense thermal modification darkens wood even more. It also takes the benefits of thermal modification to the next level.

    1×4 Dark Thermo-Alder is an exceptional sauna wall material that can be installed vertically or horizontally. The natural brown tone provides a classic, upscale sauna look. Thermally modified alder is one of the best-performing sauna woods, with a warm tone, unbeatable performance, and timeless appeal. The minimal expansion and contraction of Dark Thermo-Alder allows for tight transitions without molding.

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