Dark thermo-alder is alder taken to a deeper stage of thermal modification, which pushes the color to a rich chocolate-brown with no stain or paint. It carries the same strengths as standard thermo-alder, strong resistance to rot, cupping, and shrinkage, plus the warm fragrance alder gives off in the heat, with a darker, more dramatic look for accent walls or a fully dark-toned interior. Milled into tongue-and-groove wall cladding and eased-edge bench stock.

Not sure how much you need? Send us your wall and ceiling dimensions and we will work up an exact board count and one delivered price, so you can order once and clad it clean. 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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    Dark Thermo-Alder Wall Paneling 1×4 STS4 – Intense Thermal Modification Sauna Wood by Thermory

    Thermory
    Price range: $4.25 through $249.90

    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, seamless transitions without molding.

    Select options This product has multiple variants. The options may be chosen on the product page
    Dark Thermo-Alder Thermory 54x4 SHP Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood on Sauna Marketplace
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    Dark Thermo-Alder 5/4×4 SHP Bench, Backrest, and Skirt Sauna Wood – Intense Modification by Thermory

    Thermory
    Price range: $5.88 through $235.00

    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 cabin-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.

    Select options This product has multiple variants. The options may be chosen on the product page
    Dark Thermo-Alder Thermory 1x5 STS4 Wall and Ceiling Cladding Sauna Wood on Sauna Marketplace
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    Dark Thermo-Alder Wall Paneling 1×5 STS4 – Intense Thermal Modification Sauna Wood by Thermory

    Thermory
    Price range: $6.87 through $412.20

    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, seamless transitions without molding.

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