Thermo-Aspen
Thermo-aspen keeps everything people like about aspen, the resin-free surface, the cool touch, the smooth grain, and bakes it at high heat until it turns a warm honey-brown. That thermal modification drives out the moisture and sugars that cause movement, so the boards resist rot, cupping, and shrinkage far better than natural aspen and hold their shape through years of heat and humidity. The darker tone reads as finished without any stain. It is our most popular sauna wood, milled into tongue-and-groove wall cladding and S4SEE bench, backrest, and skirting stock with eased edges.
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.
Showing all 25 resultsSorted by price: low to high
PROSAUNAS Thermo-Aspen 1X2 SI Inside Corner Trim – Sauna Wood
Price range: $1.58 through $12.65Inside corners are where a finish job either looks done or looks almost done. The thermo-aspen SI inside corner trim, 0.55″ thick by 1.18″ wide, fits into the 90-degree seam where two cladded walls meet and gives you a clean, furniture-quality line instead of a butt joint. The thermal modification means the golden-brown color runs all the way through, so a cross-cut end won’t show pale raw wood. No resin, no splinters. Match it to your thermo-aspen walls and benches and the room reads as one continuous material. Sold by the linear foot.
Thermo-Aspen Moulding 1×1 SHP Sauna Trim, Floor, and Bench Wood By Thermory
Price range: $2.00 through $200.00Thermory Thermo-Aspen 1×1 SHP is a versatile sauna material meant for trim, benches, internal corner moulding, and sauna floors. Aspen is a smooth, cool timber to feel against bare skin. Because it doesn’t secrete resin, splinter or overheat, aspen makes for an ideal sauna material. The color of thermally modified aspen is an attractive golden brown. Thermally modified wood resists rotting, expansion, contraction, warping, and cupping.
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.
Thermo-Aspen Moulding 1×1 SI Sauna Ceiling Trim By Thermory
Price range: $2.00 through $92.40Thermory Thermo-Aspen 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 Thermo-Aspen.
Note: These will arrive directly from Thermory USA in bundles of four in 7′ and 8′ lengths.
Thermo-Aspen Moulding 1×2 Transition T by Thermory
Price range: $2.36 through $37.76Need longer boards than 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.
PROSAUNAS Thermo-Aspen 1X2 UK Door Trim – Sauna Wood
Price range: $3.15 through $25.23The detail that ties the room together. Thermo-aspen door trim in the UK profile finishes the gap between your cladding and the door frame with the same golden-brown wood you used on the walls. Thin at 0.47″, wide enough at 1.65″ to cover a clean reveal. No resin, no splinters, cool to the touch. Because it’s thermally modified, the color runs all the way through, so a mitered corner or an end cut won’t show pale raw wood. If you’ve gone with thermo-aspen walls and benches, this is the piece that makes it look intentional.
PROSAUNAS Thermo-Aspen 2X2 VA Outside Corner Trim – Sauna Wood
Price range: $3.15 through $25.23An outside corner with no raw edge showing. The thermo-aspen VA outside corner trim, 1.1″ on both faces, wraps the 90-degree exterior angle where two cladded walls meet and gives you a clean, mitered line in matching wood. Thermally modified aspen, so the golden-brown color runs all the way through, cut ends look the same as the face, and the piece won’t swell or bow in a wet sauna environment. No resin, no splinters. If you have a sauna room with an exterior corner (a bump-out, a partition, a two-room build), this is what goes there. Sold by the linear foot.
PROSAUNAS Thermo-Aspen 2X2 S4SEE SHP Moulding & Trim – Sauna Wood
Price range: $3.34 through $33.40Moulding that actually does something. The thermo-aspen 2×2 S4SEE SHP moulding at 1.1″ x 1.63″ is the piece you reach for when you need to cap a bench edge, cover a gap at the ceiling, frame a light channel, or add a clean horizontal break on a cladded wall. It’s the same thermal modification as the rest of our thermo-aspen line: heat and steam, no chemicals, golden-brown color all the way through, no warp, no resin, cool under bare skin. Available up to 10-foot lengths. Sold by the linear foot.
PROSAUNAS Thermo-Aspen 2X3 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $4.22 through $42.25Narrow bench board, long track record. Thermo-aspen at 2×3 is what most Scandinavian builders reach for when they want a clean, knot-free seat that won’t gap or warp over the years. The thermal modification (heat and steam, nothing else) turns plain aspen into a golden brown that reads as traditional to American eyes, then locks the wood so it can’t hold moisture and won’t move on you. No resin, no splinters, cool under bare skin. Thermo-aspen is the wood we reach for first, and we’d put this board in our own sauna without a second thought. Sold by the linear foot, free samples available. Questions?
Thermo-Aspen 1×4 VIRE Wall Cladding – Sauna Wood by Thermory
Price range: $4.31 through $258.60Add some life to your sauna with Thermory Vire 1×4, a unique contoured cladding for sauna walls and ceilings. This is also a favorite for adjascent walls the sauna, or for building a hidden door into a wood wall!
Thermo-Aspen is an elegant wall and ceiling cladding for saunas that has been meticulously processed using only heat and steam by Thermory, the global leader in Thermal Modification. The result is a darkened, smooth wood that won’t shrink, warp, cup, or rot when properly installed. Choose this profile for a warm, modern sauna that’s design forward.
At Sauna Marketplace, we make it easy with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
Actual wall coverage is 3.1″.
PROSAUNAS Thermo-Aspen 1X4 T&G STS4 Wall Cladding – Sauna Wood
Price range: $4.38 through $43.78A clean, classic sauna wall in the cladding width most builders start with. The 1×4 STS4 in thermo-aspen is a tongue-and-groove board, 0.59″ thick, milled 3.54″ wide for 3.1″ of coverage per row. The thermal modification takes it to a warm golden-brown that runs all the way through, so trimmed ends match the face and nothing reads as patchwork. Knot-free, no resin, stays cool against bare skin. Easy to run floor to ceiling and easy to pair with a contrasting bench or trim. Sold by the linear foot.
Thermo-Aspen 5/4×3 STEP Wall Cladding – Sauna Wood by Thermory
Price range: $4.48 through $179.20Step up your game and build the sauna of your dreams with 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.
Thermo-Aspen is an elegant wall and ceiling cladding for saunas that has been meticulously processed using only heat and steam by Thermory, the global leader in Thermal Modification. The result is a darkened, smooth wood that won’t shrink, warp, cup, or rot when properly installed. Choose this profile for a classic sauna look that’s more refined than typical North American saunas.
At Sauna Marketplace, we make it easy with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
Actual wall coverage is 2.2″ which completes the step.
1X4 Thermo-Aspen STS4 T&G Wall Cladding – Thermally Modified Sauna Wood by Thermory
Price range: $4.52 through $271.20Thermally Modified Aspen (TASP) is an elegant wall and ceiling cladding for saunas that has been meticulously processed using only heat and steam by Thermory, the global leader in Thermal Modification. The result is a darkened, smooth wood that won’t shrink, warp, cup, or rot when properly installed. Choose this profile for a classic sauna look that’s more refined than typical North American saunas.
Working with Tongue and Groove STS4 is a delight for contractors and DIY Sauna Builders alike. We’re not exagerating that every builder we work with has found the quality and consistency to be truly remarkable. At Sauna Marketplace, we make it easy with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
Actual wall coverage is 3.1″ to 3.2″ depending on installation.
PROSAUNAS Thermo-Aspen Grace™ 2X3 T&G Wall Cladding – Sauna Wood
Price range: $4.60 through $45.98Shadow grooves, thick boards, and a little architecture on your walls. The Grace 2×3 in thermo-aspen is a wide-reveal T&G wall cladding, 1.06″ thick with a 2.2″ coverage per board, designed to make a sauna wall look like a deliberate design choice instead of just paneling. The broad shadow groove between boards catches the light differently than a standard V-joint and gives the room depth. Thermal modification (heat and steam, no chemicals) locks in a warm golden-brown that won’t fade from humidity and won’t gap from moisture cycling. A real statement wall, without the pretension. Sold by the linear foot.
Thermo-Aspen 1×4 KYTE Wall Cladding – Motion Panels by Thermory
Price range: $4.62 through $277.20Step up your game and build the sauna of your dreams with Kyte Cladding by Thermory. The subtle bump out is easy to work with, but adds intrigue and a custom look to sauna walls and ceilings. It’s great look for public saunas, or anyone who wants to something a little different than standard tongue and groove.
Thermo-Aspen is an elegant wall and ceiling cladding for saunas that has been meticulously processed using only heat and steam by Thermory, the global leader in Thermal Modification. The result is a darkened, smooth wood that won’t shrink, warp, cup, or rot when properly installed. Choose this profile for a modern sauna that still feels traditional. Kyte walls can also be harnessed with basic lighting strips behind the benches to creat intrigue and shadow effects.
At Sauna Marketplace, we make it easy with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
Actual wall coverage is 3.1″.
Thermory 1×4 SHP Thermo-Aspen Bench, Backrest, and Skirt Sauna Wood
Price range: $5.09 through $254.50Thermory Thermo-Aspen 1×4 SHP Bench material is the perfect smooth, cool timber to feel against bare skin. Because it doesn’t secrete resin, splinter or overheat, aspen makes for an ideal sauna material. The color of thermally modified aspen is an attractive golden brown. Thermally modified wood resists rotting, expansion, contraction, warping, and cupping. 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 either horizontally or vertically. See below for our framing suggestion.
Thermory 5/4 SHP Thermo-Aspen Sauna Bench and Floor Wood
Price range: $5.70 through $228.00Thermory Thermo-Aspen 5/4 (previously called 2×4) SHP Bench material is the perfect smooth, cool timber to feel against bare skin. Because it doesn’t secrete resin, splinter or overheat, aspen makes for an ideal sauna material. The color of thermally modified aspen is an attractive golden brown. Thermally modified wood resists rotting, expansion, contraction, warping, and cupping. Recommended Uses: Sauna benches, backrests, flooring, and skirting.
These 1.1″ thick sauna bench boards are thick enough to build the frame, but we recommend using standard 2x4s for that. See detail below.
PROSAUNAS Thermo-Aspen Groove-S 1X3 T&G Wall Cladding – Sauna Wood
Price range: $5.98 through $59.84Narrow boards, strong lines, a wall that looks expensive. The Groove-S in thermo-aspen is a precision-milled 1×3 T&G cladding, 0.59″ thick, with a tight shadow groove that turns an ordinary sauna wall into something with real visual snap. At 2.1″ coverage per board, you get a lot of linear rhythm per square foot. The thermo-aspen color, warm golden-brown, runs all the way through, so trimmed ends match the face and nothing reads as patchwork. Knot-free, no resin, stays cool. Pairs well with thicker profiles as a contrast element. Sold by the linear foot.
PROSAUNAS Thermo-Aspen 2X4 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $6.15 through $61.45A clean, comfortable bench board in the everyday width. Thermo-aspen milled at 2×4, surfaced on all four sides with eased edges so there is nothing sharp where you sit, 3.54″ wide and 1.1″ thick. Aspen does not bleed resin, does not splinter, and sits cool under bare skin even when the room is hot. The thermal modification, heat and steam and nothing else, takes it to a golden brown and stops the movement that opens gaps over the years. Aspen is the bench wood we sell more of than any other. Sold by the linear foot.
1X5 Thermo-Aspen STS4 Wall Cladding – Thermally Modified Sauna Wood by Thermory
Price range: $6.18 through $370.80Wide plank Thermally Modified Aspen (TASP) is an elegant wall and ceiling cladding for saunas that has been meticulously processed using only heat and steam by Thermory, the global leader in Thermal Modification. The result is a darkened, smooth wood that won’t shrink, warp, cup, or rot when properly installed. Choose this profile for a classic sauna look that’s more refined than typical North American saunas.
Working with Tongue and Groove STS4 is a delight for contractors and DIY Sauna Builders alike. We’re not exagerating that every builder we work with has found the quality and consistency to be truly remarkable. At Sauna Marketplace, we make it easy with matching benches, backrests, bench skirts, vent hatches, floor grids, and more.
Actual wall coverage is 4.3″.
PROSAUNAS Thermo-Aspen 1X5 T&G STS4 Wall Cladding – Sauna Wood
Price range: $6.76 through $67.58A little more width, a little more calm. The 1×5 STS4 in thermo-aspen is a tongue-and-groove board, 0.59″ thick, milled 4.72″ wide for 4.3″ of coverage per row, so the wall reads with fewer seams across a given run. The thermal modification gives it a warm golden-brown tone all the way through, so cut ends match the face. Knot-free, no resin, stays cool to the touch. A clean choice when you want a broad, quiet wall. Sold by the linear foot.
PROSAUNAS Thermo-Aspen 3X3 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $11.62 through $92.96Bench legs that don’t need to be babied. The 3×3 thermo-aspen is a glulam engineered bench support, 2.68″ square on both faces, built to carry weight in a wet, hot room for years without moving. Same thermal modification as everything else in our thermo line: heat and steam, no chemicals, golden-brown color that runs all the way through the wood. Strong, stable, and cool to the touch. Order your bench boards and these together and the whole system ships as one delivery. Sold by the linear foot, free samples available.
PROSAUNAS Thermo-Aspen 2X6 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood
Price range: $11.89 through $118.92The bench wood we have the most opinions about. Thermally modified aspen, milled wide at 2×6 so a bench or backrest reads as one clean surface. Aspen doesn’t bleed resin, doesn’t splinter, and sits cool under bare skin even when the room is ripping. The thermal modification (heat and steam, nothing else) takes it to a golden brown and stops the expansion that opens gaps over the years. Aspen is the wood we sell more of than any other, season after season. Pair it with thermo-aspen or thermo-spruce walls for the matched look.
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.
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.
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.
Prebuilt
Sauna Brushes
Vents