Alder
Alder has long been known as nature’s perfect sauna companion, with natural water-repellent properties and balanced thermal conductivity that prevent overheating while keeping the room comfortable and balanced. The reddish tones, understated honey-like scent, and pleasant texture make it a safe choice with wide appeal. Alder works equally well for wall panels and bench boards, and our stock is milled with eased edges so it feels good against bare skin.
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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Prebuilt Sauna Bench Modules
$327.60Prebuilt sauna bench modules make it easier than ever to create a high-end DIY sauna in any space. Expandable to any size, and taking corners seamlessly with degree fan-modules that be nearly impossible to build on site.
5/4 x 4 SHP Alder Bench, Backrest, and Skirt Sauna Wood
Price range: $5.46 through $246.00Alder 1×4 SHP Bench material is the classic choice for a timeless sauna. With subtle yet appealing tone and aroma, Alder is the perfect natural sauna material with moisture wicking properties. Recommended Uses: Sauna benches, backrests, and skirting.
1×4 Bench Boards are an easy and low-cost way to build a premium sauna bench framed with standard 2x4s and decked with these .83″ thick boards horizontally or vertically. See below for our framing suggestion.
Thermory 1×4 SHP Alder Bench, Backrest, and Skirt Sauna Wood
Price range: $4.10 through $246.00Alder 1×4 SHP Bench material is the classic choice for a timeless sauna. With subtle yet appealing tone and aroma, Alder is the perfect natural sauna material with moisture wicking properties. Recommended Uses: Sauna benches, backrests, and skirting.
1×4 Bench Boards are an easy and low-cost way to build a premium sauna bench framed with standard 2x4s and decked with these .83″ thick boards horizontally or vertically. See below for our framing suggestion.
Alder Wall To Wall Flat T Transition Trim
$34.80Need longer wall cladding boards in alder than those available by Thermory? We make those transitions easy with this T moulding to avoid gaps with a professional look. Common on walls and ceilings in commercial saunas.
Note: These will arrive directly from Thermory USA in bundles of two in 7′ and 8′ lengths.
Alder Moulding 1×1 SI Sauna Ceiling Trim By Thermory
Price range: $2.00 through $64.00Alder 1×1 SI makes sauna building easier than ever. These 0.59″x 0.71″ are ideal for concealing the gap and giving a professional finish to any wall-to-ceiling transition. Make it easy, make it beautiful with Thermory 1×1 ceiling mouldings in Alder.
Note: These will arrive directly from Thermory USA in bundles of four in 7′ and 8′ lengths.
Alder Moulding 1×1 SHP Sauna Trim, Floor, and Bench Wood By Thermory
Price range: $2.00 through $160.00Alder 1×1 SHP is a versatile sauna material for trim, benches, internal corner molding, and sauna floors. Cover any inward-facing corners in your sauna with this elegant moulding profile in natural alder. Alder is a hardy and water-repellent wood that doesn’t overheat, with a beautiful reddish tone and a pleasant texture.
These 0.83″ thick boards are ideal for creative projects and making your sauna design truly unique. Note: These can only be purchased in bundles of 10 in 7′ and 8′ lengths.
Alder 5/4×3 STEP Wall Cladding – Sauna Wood by Thermory
Price range: $3.72 through $145.82Step up your game and build the sauna of your dreams with Alder STEP Cladding by Thermory. The broad, square grooves create a striking shadow effect, adding depth and intrigue to any space. It’s our go-to for vertical wall cladding in any high-end sauna build.
Alder is a popular and timeless sauna wood with natural water repelling properties. It’s a medium tone with reddish tints and a subtle honey-like aroma. At Sauna Marketplace, we make it easy to build an Alder sauna with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
The actual wall coverage is 2.2″, which completes the step.
1X5 Brushed Black Alder STS4 Wall Cladding – Sauna Wood by Thermory
Price range: $6.52 through $391.20Looking 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.
1X5 Alder STS4 Wall Cladding – Natural Sauna Wood by Thermory
Price range: $5.41 through $324.60Wide plank alder is a solid choice for any traditional Finnish sauna. Natural alder is naturally resistant to water and a favorite among sauna builders who prefer a timeless, classic look with mild aroma.
Actual wall coverage is 4.3″.
1X4 Alder STS4 T&G Wall Cladding – Sauna Wood by Thermory
Price range: $3.62 through $217.20Coveted in Finland and worldwide, European alder brings timeless elegence to your sauna with its distinctive reddish tone and inviting texture. This premium 1×4 natural profile offers excellent thermal properties (0.12 W/m·K) and sound absorption, creating the ideal surroundings and conditions for healing heat. Completely untreated and E1 certified for ultra-low emissions, this alder tongue and groove cladding maintains its warm, honey-like fragrance while providing the perfect balance of durability and comfort. Choose this medium-toned Estonian-crafted wood for an authentic sauna experience that harmonizes tradition with European quality standards.
1×4 STS4 By Thermory might just be nature’s perfect sauna companion.
Prebuilt Bench Skirt by Thermory
$275.00It’s easier than ever to complete your sauna with a prebuilt sauna bench skirt in thermally modified Aspen or Alder.
Thermory Prebuilt Sauna Backrest
$330.00Ready-to-install sauna backrests from Thermory – the quick and easy solution in good taste. Pairs perfectly with our prebuilt bench modules to make the DIY sauna easier with a more professional result.
PROSAUNAS Alder 2X4 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $5.24 through $52.36
PROSAUNAS Alder 1X5 T&G STS4 Wall Cladding – Sauna Wood
Price range: $6.54 through $65.45
PROSAUNAS Alder 1X4 T&G STS4 Wall Cladding – Sauna Wood
Price range: $4.00 through $40.03
PROSAUNAS Alder Grace™ 2X3 T&G Wall Cladding – Sauna Wood
Price range: $4.81 through $38.47The wall profile that makes people stop and ask what species that is. Grace is a wide tongue-and-groove with a precision shadow reveal, and in natural alder the warm reddish-brown tone makes those grooves pop. Each board is 2.52" wide with 2.2" net coverage, milled in Estonia to 1.06" thick. Dramatic for a wall, clean for a ceiling, honestly different from the usual sauna paneling. Pairs with any alder bench board for a matched room. Sold by the linear foot in 1 and 8 ft lengths.
PROSAUNAS Alder 3X3 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $11.62 through $92.96The leg of the operation. This is the 3×3 glulam alder bench support, 2.68" square, engineered from natural alder for the structural parts of a sauna bench. Not a finish piece: it’s what holds everything up. Same warm reddish-brown alder, same E1 certification, milled in Estonia. At 2.68" x 2.68" (68mm x 68mm), it’s got the cross-section to handle bench loads without flex. Matches the alder bench board family if you want the whole structure in one species. Sold by the linear foot in 1 and 8 ft lengths.
PROSAUNAS Alder 2X6 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $10.68 through $106.85Wide-board alder bench material, and it reads completely differently than the 2×3. At 5.51" wide (140mm), each board is a statement. Same natural alder warmth: reddish-brown, fine grain, a soft honey scent when steam hits it. Milled in Estonia to S4SEE spec, 1.1" thick, eased edges on all four sides. Water-repellent, stays cool under bare skin, E1 certified. If you want a bench or backrest that reads as one clean, warm surface rather than a field of narrow slats, this is your board. Sold by the linear foot in 1, 9, and 10 ft lengths.
PROSAUNAS Alder 2X3 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $4.00 through $40.07Sit on it for five minutes and you’ll understand why Finland has been using alder on benches for a hundred years. This is the 2×3 S4SEE bench board in natural alder, milled in Estonia to 1.1" thick by 2.56" wide, surfaced four sides with eased edges. Warm reddish-brown tone, fine grain, a faint honey scent when the room heats up. Water-repellent and stays cool against bare skin. Good clear cedar now runs nearly three times the price; alder is the honest alternative for a timeless Finnish room. Sold by the linear foot in lengths from 1 to 10 ft.
PROSAUNAS Alder 2X2 S4SEE SHP Moulding & Trim – Sauna Wood
Price range: $3.48 through $34.73The trim piece that pulls a room together. This is the alder 2×2 S4SEE moulding: 1.1" square (28mm x 28mm), surfaced four sides with eased edges, milled in Estonia from natural alder. Use it to cap bench edges, frame out a heater enclosure, or add a furniture-quality line wherever you need one. Warm reddish-brown tone matches the alder bench and cladding family exactly. At $3.48 per linear foot it’s the least glamorous piece in the room, but the room looks noticeably better with it. Sold by the linear foot in 1, 8, 9, and 10 ft lengths.
PROSAUNAS Alder 2X2 VA Outside Corner Trim – Sauna Wood
Price range: $3.07 through $24.57Outside corners are the exposed edges, which means they’re what people see and touch first. This is the alder VA outside corner trim: 1.1" square (28mm x 28mm), angle-moulded to wrap outside corners cleanly in natural alder. Same warm reddish-brown tone as the rest of the ProSaunas alder family, milled in Estonia, E1 certified. Beefier than the inside corner piece at the same 1.1" section, which makes sense: outside corners take contact. At $3.07 per linear foot it finishes the room where the finish matters most. Sold by the linear foot in 1 and 8 ft lengths.
PROSAUNAS Alder 1X2 SI Inside Corner Trim – Sauna Wood
Price range: $1.36 through $10.90Corners make or break a cladded room. This is the alder SI inside corner trim: 0.55" thick by 1.18" wide (14mm x 30mm), milled in Estonia to close out the inside corners where two cladded walls meet. Without it, the cladding ends look ragged. With it, the room reads furniture-quality. Natural alder, warm reddish-brown, E1 certified, and at $1.36 per linear foot it’s the lowest-cost piece in the alder family. Sold by the linear foot in 1 and 8 ft lengths.
PROSAUNAS Alder 1X2 UK Door Trim – Sauna Wood
Price range: $3.07 through $24.57Every sauna door looks better with this on it. The alder 1×2 UK door trim, 0.47" thick by 1.65" wide (12mm x 42mm), milled in Estonia from natural alder for clean, finished doorway edges. This is the piece that makes the transition from framing to cladding look intentional. Warm reddish-brown alder tone, fine grain, E1 certified. Water-repellent and cool to the touch. It’s a finishing detail, not a structural piece, but a sauna doorway without it reads unfinished. Sold by the linear foot in 1 and 8 ft lengths.
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