Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
Bench-Board_Shp_27X85_Dark-Thermo-Alder_Thermory_2-Scaled Dark-Thermo Alder Sauna Wood
Dark Thermo-Alder 5/4X4 Shp Bench, Backrest, And Skirt Sauna Wood - Intense Modification By Thermory - Image 4
Thermo-Alder 1X4 Shp Sauna Bench Skirt And Backrest Wood By Thermory
Expert help that stays with you

Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Open the 3D planner.

Specs
Made in
Size5.9 Linear Feet – Bundle of 4, 6.8 Linear Feet – Bundle of 4, 7.8 Linear Feet – Bundle of 4, 8.8 Linear Feet – Bundle of 4, 9.8 Linear Feet – Bundle of 4, Free Sample
Model5/4 SHP Bench
ProfileSHP
Coverage3.3″
Actual Dimensions1.1in x 3.3in
Boards per Bundle4
Stock Lengths5′-10′
Attachments
Gallery
Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
Bench-Board_Shp_27X85_Dark-Thermo-Alder_Thermory_2-Scaled Dark-Thermo Alder Sauna Wood
Dark Thermo-Alder 5/4X4 Shp Bench, Backrest, And Skirt Sauna Wood - Intense Modification By Thermory - Image 4
Thermo-Alder 1X4 Shp Sauna Bench Skirt And Backrest Wood By Thermory

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

    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.

    Build Your Quote:

    $5.88 per linear footFree samples available

    Get a free sample

    Free sample · Free shipping · No payment needed

    One per wood. Ships within the continental US (lower 48 and DC).

    Shipping Unloading Notice
    Shipping

    Important: Only select ‘Flat Rate Shipping – $795’ once per order. For all other wood items you add, choose ‘Part of existing shipment’

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    Thermory

    Dark Thermo-Alder 5/4×4 SHP Boards — Benches, Backrests & Skirts

    Using a standard 2×4 frame with cross-bracing every 12–16″, this planner estimates how many Thermory dark thermo-alder 5/4×4 SHP boards you need for benches, wall backrests, and under-bench skirts.

    Finished board size ≈ 3.5″ × 1″. Each board shows 3.5″ of face. Boards come in bundles of 4 in these stock lengths (LF): 5.9, 6.8, 7.8, 8.8, 9.8. Price is per linear foot. Free samples available.

    Bench Planner

    Set bench width (left-to-right) and depth (front-to-back), choose your preferred gap, and the calculator will auto-tune the actual gap so you don’t have to rip boards. Includes bench top + one front fascia board.
    6′0″ (72″)
    3′6′10′
    1′8″ (20″)
    16″24″36″
    0.50″ actual (target 0.50″)
    0.10″3/8–5/8″ sweet spot0.75″

    The calculator adjusts the actual gap to fill the depth with full boards (no ripping), while staying between 0.10″ and 0.75″. Most benches feel best with gaps around 3/8″–5/8″.

    Extra covers waste, trimming, and imperfect pieces.

    Per Bench — —

    Includes seat boards + one fascia board along the front. Gaps are auto-optimized for full boards and efficient use of material.

    Backrest & Skirt Planner

    Plan wall backrests or under-bench skirts using Thermory dark thermo-alder 5/4×4 SHP boards. Boards run along the length; we calculate how many boards you need across the height.
    8′0″ (96″)
    4′10′16′
    8′0″ (96″)
    4′10′16′
    0.50″ actual (target 0.50″)
    0.10″3/8–5/8″ sweet spot0.75″

    The calculator adjusts the actual gap to fill the height with full boards (no ripping), while staying between 0.10″ and 0.75″.

    Extra covers waste, trimming, and imperfect pieces.

    Per Backrest / Skirt — —

    Boards run along the length. Gaps are auto-optimized so you can use full boards across the height without ripping.

    Surfaces (Benches, Backrests & Skirts)

    Surface Dimensions Board length Bundles (raw)
    Add benches, backrests, or skirts to list them here.

    Bundles to Order by Stock Length (rounded per length)

    Stock length (LF, bundle of 4) Bundles to order Raw bundles
    Add benches, backrests, or skirts to see the breakdown.

    Grand total: 0 bundles · 0.0 raw bundles before rounding.

    Order Line Items (Title / Description / Quantity)

    Title Description Quantity (bundles)
    Add benches, backrests, or skirts to see line items.

    Specifications

    Application: Interior, Sauna Materials
    Use: Interior Only
    Type: Standard Stock, Bench Board, Backrest, skirt, floor
    Species: Alder (Modified)
    Color: Light Brown
    Authorized Dealer: Sauna Marketplace
    Finish: Unoiled, Unwaxed
    Installation type: Hidden
    Profile: No Groove
    Installation methods: Screw
    Modification Strength: Intense

    5/4x4 Dark Thermo-Alder SHP

    Thickness: 1.1"
    Width: 3.5
    Coverage: 3.5

    Testing

    • Safety & Compliance
      • Conforms with EC Regulation No 305/2011
      • Meets EN 14915:2013 standards for solid wood paneling
      • E1 formaldehyde emission class (low emissions)
      • Fire reaction class D-s2, d0 (moderate fire resistance)
    • Natural Material Benefits
      • 100% natural solid wood (Common alder/Alnus glutinosa)
      • No surface coating - authentic, chemical-free finish
      • Interior use specification - perfect for sauna walls
    • Technical Advantages
      • Thermal conductivity of 0.12 W/(m·K) - excellent insulation properties
      • Density range of 31 to 33 lb/ft³ - solid but not overly heavy
      • Sound absorption coefficient of 0.1/0.3 - helps create a quieter space
    • Estonian Craftsmanship
      • Manufactured by Thermory AS in Estonia
      • European quality standards and manufacturing processes
    • Durability
      • Biological durability Class 5 according to EN 350:2016

    One Stop Sauna Shop

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      Building Benches Using Standard 2x4s

      This sauna wood is fairly thin and requires dimensional 2x4's to build the frame underneath.  That makes it cheaper, more sturdy, and you can construct it in a way that you won't see the wood. 

      We also like this method becuase there's no tablesaw involved.  

      If you are concerned about light wood showing through, you can use Western Red Cedar 2x4's or paint the 2x4s black using Supi sauna wax or SaunaLife Sauna Wax.

      Include cross bracing every 16" on center.  For extra long spans, consider using 2x6 material for the frame or bracing it from underneath with metal running the full length.

      The recommended gap is at least 1/4" to allow airflow and drainage. It's important to note that wider gaps, up to 3/4" is best for airflow and heat distribution. This is where you'll have to weigh aestetics vs performance.

      Picture showing detail on How to build sauna benches using standard 2x4 frame and sauna marketplace bench boards shown in thermo-aspen 1x4 or 54 SHP

      Thermory's Process

      Need a Quick And Easy Materials Quote?

      Just bring your dimensions, choose your style, and we'll take it from there.
      Click Here
      thermory alder compare different thermal modification tones

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      Planning guides: Choosing sauna woodSauna vapor barrier guide

      Expert help that stays with you

      Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

      Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

      We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

      Sauna and heater customers also receive free shipping on sauna accessories for life.

      Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Open the 3D planner.

      Specs
      Made in
      Size5.9 Linear Feet – Bundle of 4, 6.8 Linear Feet – Bundle of 4, 7.8 Linear Feet – Bundle of 4, 8.8 Linear Feet – Bundle of 4, 9.8 Linear Feet – Bundle of 4, Free Sample
      Model5/4 SHP Bench
      ProfileSHP
      Coverage3.3″
      Actual Dimensions1.1in x 3.3in
      Boards per Bundle4
      Stock Lengths5′-10′
      Attachments
      Gallery
      Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
      Dark Thermo-Alder Thermory 54X4 Shp Bench, Backrest, Skirt, Floor Thermally Modified Sauna Wood On Sauna Marketplace
      Bench-Board_Shp_27X85_Dark-Thermo-Alder_Thermory_2-Scaled Dark-Thermo Alder Sauna Wood
      Dark Thermo-Alder 5/4X4 Shp Bench, Backrest, And Skirt Sauna Wood - Intense Modification By Thermory - Image 4
      Thermo-Alder 1X4 Shp Sauna Bench Skirt And Backrest Wood By Thermory