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Authorized Retailer
Full-Value Freight Protection
Lifetime Expert Support
4.9/5 from 464+ Customer Reviews
Thermo-Aspen tongue-and-groove paneling board, angled view showing four raised ribs and grooves along its length
ProSaunas

ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S

Thermo-Aspen tongue-and-groove paneling for sauna walls and ceilings, Groove-S profile. Sold by the piece in 1 ft, 5 ft and 10 ft lengths.

$5.98
+Shipping

In stock

Estimated delivery

7–12 days after you order

  • Thermally modified aspen: heat, steam and pressure, no chemicals
  • Groove-S profile, covers 2.1 in of wall per board
  • Sold by the piece in 1 ft, 5 ft and 10 ft lengths
Length: 1'

Flat-rate freight from $195 to the contiguous US, set by board count and the longest board. Your rate shows at checkout; boards over 10 ft are quoted after you order.

  • Covered by the manufacturer's warranty

    Products are sourced through authorized channels and include the applicable manufacturer warranty, subject to the manufacturer's terms. Terms vary by brand and model, and we'll send you the exact warranty document on request.

    If something goes wrong, contact us first: we help troubleshoot and coordinate the claim with the manufacturer.

    Contact our team

  • Full-Value Freight Protection

    Large orders ship fully insured. If freight arrives damaged, Topture helps coordinate the claim and replacement process with the carrier and manufacturer.

    At delivery, note any damage on the delivery receipt and take photos before the driver leaves, then report it to us within 24 hours.

    How freight delivery works Shipping policy

  • We're here after your purchase, too.

    Need help with delivery, installation documentation, heater questions or a warranty issue? Our team can help you find answers and coordinate with the manufacturer when needed.

    Contact our team

Description

ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S is a thermally modified aspen board for lining sauna walls and ceilings. Each board is 0.59 in thick and 2.36 in wide, covers 2.1 in of wall once fitted, and is sold by the piece in 1 ft, 5 ft and 10 ft lengths.

What is thermally modified aspen?

Thermo-Aspen is aspen treated with heat, steam and pressure. ProSaunas describes the process as chemical-free and says it leaves the wood less prone to warping, twisting and shrinking, less absorbent of moisture and quicker to dry, and less susceptible to fungal decay and rot. The treatment often gives the wood a richer, darker color.

ProSaunas selects straight-grained Thermo-Aspen with a uniform texture and describes its color as golden brown; it does not secrete resin, splinter or overheat.

The Groove-S profile

ProSaunas mills this Groove-S board's face into fluted slats, and notes it gives a striking contrast beside other profiles and wood types. Each board's tongue fits into the groove of the next, so the boards lock together into one continuous surface.

Nominal 1x3 vs. actual size

"1x3" is the nominal size: the board's size when it is cut from the log, before drying and surfacing. The finished board is 0.59 in thick and 2.36 in wide. Its tongue sits in the groove of the next board, so each board covers 2.1 in of wall rather than its full width.

How many boards do you need?

One linear foot of this board covers about 0.18 sq ft of wall (2.1 in of coverage × 12 in). To estimate an order, multiply the wall and ceiling area in square feet by 5.71 to get linear feet, then divide by the board length you choose. For example, 100 sq ft in 10-ft boards is about 571 linear ft, or 58 boards, before an allowance for cuts. The number of boards also sets the freight rate shown under Shipping.

Matching paneling, bench wood and trim

Most saunas are built in one wood. Thermo-Aspen Sauna Wood collects every Thermo-Aspen paneling profile, bench size and trim piece, so the bench wood and trim can be matched to this paneling. Sauna Paneling lists every paneling profile in all species.

Cleaning and care

ProSaunas recommends wiping benches, walls and floors with a mild detergent solution to remove sweat, oils and dirt, and ventilating the sauna after each use so moisture does not build up and lead to mold or mildew.

Features
  • Thermally modified aspen: heat, steam and pressure, no chemicals
  • Groove-S tongue and groove
  • For sauna walls and ceilings
  • Covers 2.1 in of wall per board
  • Sold by the piece in 1 ft, 5 ft and 10 ft lengths
Specifications
ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S: specifications
Species Thermo-Aspen, thermally modified
Finish Thermally modified, unfinished
Profile Groove-S tongue and groove
Nominal size 1x3
Actual thickness 0.59 in
Actual width 2.36 in
Wall coverage per board 2.1 in
Lengths 1, 5 and 10 ft
Sold by The piece: one board per unit, in the length you choose
Use Sauna walls and ceilings
Shipping

ProSaunas sauna wood from Topture ships to the 48 contiguous US states at a flat freight rate. Checkout calculates it from two things: how many boards are in the order, counted across all sauna wood in the cart, and the length of the longest board. It appears at checkout as "Insured Shipping": every Topture shipment is insured.

How much does shipping cost for sauna wood?

Freight per order to the contiguous US, by number of boards (rows) and longest board (columns)
Boards Up to 8 ft Over 8 ft, up to 10 ft
1–19 $195 $295
20–39 $395 $495
40–99 $495 $595
100–299 $695 $795
300–499 $895 $995
500–799 $995 $1,095
800–999 $1,295 $1,395

The rate is for the whole order, not per board: 30 boards of up to 8 ft ship for $395 in total. One board longer than 8 ft moves the whole order to the right-hand column, so 30 boards of 8 ft plus one 10 ft board ship for $495. If the order also contains other products, their shipping is calculated separately and added at checkout.

Which sauna wood orders are quoted after checkout?

Boards longer than 10 ft, orders of 1,000 boards or more, and deliveries to Alaska, Hawaii, US territories or Canada ship by freight quoted for the delivery address. Topture sends the quote after you order, and it is paid separately.

How is sauna wood delivered?

  • Boards up to 8 ft: smaller orders usually ship by parcel in cardboard, and larger orders on a pallet by LTL freight with a liftgate.
  • Boards over 8 ft: on a pallet by LTL freight without a liftgate, so unloading needs a dock or hand offloading at the delivery address. The carrier allows one hour before extra charges apply.
  • Freight is delivered curbside by appointment.
  • Some remote addresses don't qualify for the flat rate; Topture confirms any extra charge with you before the order ships.

REAL HOMES. REAL REVIEWS.

What Topture Customers Say

Topture is rated 4.9/5 across 464 customer reviews

We thought about buying a sauna for years and finally did. We absolutely love it, especially in the winter. It’s incredibly easy to assemble with two people the whole family uses it.

Verified buyer

Ordered this sauna fall 2024 and we love it. No better feeling during a Minnesota winter. Lastly, I have to mention the customer service for this purchase has been like no other. Any questions or requests I had were addressed immediately by Topture. I got more than I expected from them and have already recommended them to several people looking for saunas. SO if you're thinking about it, JUST DO IT already..

Verified buyer

Thanks for the great service - greatly appreciated.

Verified buyer
464 Customer Reviews

Product and store reviews from Topture customers, collected by Judge.me.

Lifetime Expert Support

Same team before and after the sale, from sizing to warranty support.

Authorized ProSaunas Retailer

Sold by Topture, with the applicable manufacturer warranty.

Full-Value Freight Protection

Freight damage? We help coordinate the claim and replacement process.

STILL UNSURE?

Frequently Asked Questions

What is the ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S used for?
The ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S is tongue-and-groove paneling in thermally modified aspen for lining the walls and ceilings of a sauna, which is where ProSaunas recommends it. ProSaunas mills this Groove-S board's face into fluted slats, and notes it gives a striking contrast beside other profiles and wood types. Each board is 0.59 in thick and 2.36 in wide and covers 2.1 in of wall once fitted.
How many Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S boards do I need?
Each ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S board covers 2.1 in of wall, so one linear foot of board covers about 0.18 sq ft. Multiply the wall and ceiling area in square feet by 5.71 to get linear feet, then divide by the board length: 100 sq ft in 10-ft boards is about 58 boards, before an allowance for cuts. The board count and the longest board also set the freight rate.
What are the actual dimensions of the Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S?
The ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S is a nominal 1x3: the size when the board is cut from the log, before drying and surfacing. The finished board is 0.59 in thick and 2.36 in wide, and each board covers 2.1 in of wall once its tongue sits in the next board's groove. It is sold by the piece in 1 ft, 5 ft and 10 ft lengths.
What is Thermo-Aspen and why use it in a sauna?
The ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S is made from Thermo-Aspen, which is aspen treated with heat, steam and pressure. ProSaunas describes the process as chemical-free and says it leaves the wood less prone to warping, twisting and shrinking, less absorbent of moisture and quicker to dry, and less susceptible to fungal decay and rot. The treatment often gives the wood a richer, darker color. ProSaunas selects straight-grained Thermo-Aspen with a uniform texture and describes its color as golden brown; it does not secrete resin, splinter or overheat.
How do you clean and care for the Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S?
The ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S is supplied thermally modified and otherwise unfinished. ProSaunas recommends wiping benches, walls and floors with a mild detergent solution to remove sweat, oils and dirt, and ventilating the sauna after each use so moisture does not build up and lead to mold or mildew.
How is the Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S shipped, and what does shipping cost?
The ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S ships to the contiguous US at a flat freight rate that checkout calculates from the number of boards and the length of the longest board: 1–19 boards up to 8 ft ship for $195, 20–39 boards for $395 and 40–99 boards for $495, with higher tiers up to 999 boards. Boards over 10 ft, orders of 1,000 boards or more, and deliveries to Alaska, Hawaii, US territories or Canada are quoted after the order. Every Topture shipment is insured.
Where can I buy ProSaunas Thermo-Aspen paneling?
Topture is an authorized ProSaunas retailer and sells the ProSaunas Thermo-Aspen 1x3 Tongue & Groove Sauna Paneling, Groove-S by the piece in 1 ft, 5 ft and 10 ft lengths, alongside matching ProSaunas paneling, bench wood and trim in Thermo-Aspen. Every order ships insured, and Topture offers Lifetime Expert Support for planning a sauna build.

General Topture Questions

Where are you located, and where do you ship from?

Topture is an online retailer serving customers in the contiguous United States. The company is Topture LLC, a Wyoming limited liability company, and its registered business address is 30 N Gould St, Ste N, Sheridan, WY 82801.

Orders ship from manufacturer and distributor warehouses in the U.S. and Canada, and some products ship directly from the manufacturer in Europe. Each product page shows its estimated delivery time.

How much is shipping?

Orders over $200 ship free within the contiguous United States. Orders under $200 carry a small shipping fee.

Four exceptions: SaunaLife and ThermaSol products carry a freight charge at any order value, ProSaunas sauna wood ships at a flat freight rate set by the number of boards and the longest board, ProSaunas sauna doors and windows ship at a flat rate per order shown on their product page, and sauna stones ordered without a heater ship at $60 per box because of their weight.

Every charge is shown at checkout before you pay.

Do you provide financing?

Absolutely! To view your financing offer, simply select Shop Pay Installments as your payment method at Step 3 of checkout.

You'll need to enter a debit card to receive your offer, but don’t worry—you can still back out before completing the purchase.

How long will it take for my items to arrive?

If your order is in stock, most orders ship within 2–7 business days of purchase. Transit time then depends on the distance from the warehouse and, for freight, on booking a delivery appointment.

For custom, pre-order or made-to-order items, the estimated delivery time frame is listed on the product page. Delivery dates are estimates, so please don't book installation labor until your order has arrived and been inspected.

What happens after I place my order?

As soon as you place your order, you'll receive a confirmation email with your order details—be sure to keep it for your records. Once your order ships, you'll receive another email with tracking information.

For freight deliveries, the carrier will call or text you to schedule an appointment once the shipment reaches their local terminal. Someone needs to be there to inspect the shipment and sign for it. Smaller parcels arrive by UPS or FedEx without an appointment.

Is there a warranty?

Yes. Products purchased through Topture include the applicable manufacturer’s warranty, subject to the manufacturer’s terms. You’ll find the warranty details for each product under the "Warranty" tab on its product page, and we help with troubleshooting and warranty coordination if an issue comes up.

Do you have a showroom?

We don’t have a showroom — we sell online. Our team is available by phone, email and chat to help you compare models, sizes and heaters, and we can send dimensions, installation manuals and electrical requirements before you buy.

Where do you deliver to?

We deliver throughout the 48 contiguous states, with curbside freight delivery for large items. Free shipping and standard rates apply there only. Alaska, Hawaii, Puerto Rico, other U.S. islands and Canada are quoted separately, depending on the brand and model. We can't ship freight or oversized items to P.O. boxes.

Do you ship internationally?

International Shipping

For many products, yes, including to Canada, by custom quote. Email contact@topture.com with the product and your address before you order; availability and cost depend on the brand and model. Any duties, taxes and customs fees are your responsibility.

Shipping to Hawaii, Alaska, and Puerto Rico

Free shipping applies to the contiguous United States only. Shipping to Alaska, Hawaii, Puerto Rico and other U.S. islands is quoted separately and depends on the brand and model. Email contact@topture.com for a quote before you order.

Thermo-Aspen tongue-and-groove paneling board, angled view showing four raised ribs and grooves along its length

Your sauna wall cladding, done the right way.

  • Thermally modified aspen: heat, steam and pressure, no chemicals
  • Groove-S profile, covers 2.1 in of wall per board
  • Sold by the piece in 1 ft, 5 ft and 10 ft lengths

  • Covered by the manufacturer's warranty

    Products are sourced through authorized channels and include the applicable manufacturer warranty, subject to the manufacturer's terms. Terms vary by brand and model, and we'll send you the exact warranty document on request.

    If something goes wrong, contact us first: we help troubleshoot and coordinate the claim with the manufacturer.

    Contact our team

  • Full-Value Freight Protection

    Large orders ship fully insured. If freight arrives damaged, Topture helps coordinate the claim and replacement process with the carrier and manufacturer.

    At delivery, note any damage on the delivery receipt and take photos before the driver leaves, then report it to us within 24 hours.

    How freight delivery works Shipping policy

  • We're here after your purchase, too.

    Need help with delivery, installation documentation, heater questions or a warranty issue? Our team can help you find answers and coordinate with the manufacturer when needed.

    Contact our team