PROSAUNAS Sauna Wood, 1x3 Thermo-Aspen Tongue & Groove, Fluted Slat

Thermo-Aspen Groove-S 1x3 T&G

Name: Thermo-Aspen Groove-S 1x3 T&G
Brand: Prosaunas
SKU: WOOD672-1
Price: 7.04 USD
Availability: InStock

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Refined Texture, Striking Contrast

The Thermo-Aspen Groove-S 1x3 brings a bold, design-forward edge to sauna walls and ceilings. Precision-milled fluted slats create a dramatic visual rhythm that stands beautifully on its own or pairs with other profiles and wood types for a layered, upscale finish.

Premium Thermo-Aspen, Thoughtfully Selected

Prosaunas sources straight-grained Thermo-Aspen with a uniform texture and warm, rich hue. Thermally modified through an organic process using heat, steam, and pressure, this wood is more dimensionally stable, more water-resistant, and far superior to untreated wood for resisting decay, pests, and harmful fungi — making it a natural choice for the sauna environment. It does not secrete resin, will not splinter, and remains comfortable to the touch even in high heat.

Crafted to Exacting Standards

Every piece is milled to 15 × 60 mm (actual dimensions) in a 292 mm length, offering clean, consistent sizing for your project. Prosaunas draws on more than 55 years of sauna-room craftsmanship and selects only the finest wood from Northern Europe and Canada — so what arrives at your door reflects the same stringent quality standards trusted across North America.

PRODUCT SHEET

PROSAUNAS Thermo-Aspen Sauna Wood Interior

Thermo-Aspen Groove-S 1x3 T&G

Length Per Piece: 1' 1' 5' 10'

Product variants

$7.04 USD

Freight added at checkout

Installation Required

These tongue-and-groove panels are installed by nailing or clipping each board into place on wall or ceiling framing. You will need basic woodworking tools to cut boards to length and fit around any vents or fixtures.

Description

Features

What's Included?

Size & Weight

Electrical Specs

Shipping & Delivery

Warranty

Documents

Description

Thermo-Aspen Groove-S tongue-and-groove panelling gives you a clean, consistent wall or ceiling finish sized at 1x3 (15mm × 60mm). The thermally modified aspen has been heat-treated to stabilize the wood against the moisture cycles of sauna use, reducing the warping and resin bleed that untreated softwoods can develop over time.

The Groove-S profile adds a subtle shadow line between boards, creating visual texture without breaking the smooth plane of the wall. Available in 1-foot, 5-foot, and 10-foot lengths, you can order the size that minimizes offcuts for your specific interior dimensions.

Key Features

Thermally modified aspen — heat treatment stabilizes the wood dimensionally, so boards resist warping and checking through repeated sauna humidity cycles
1x3 nominal profile (15mm × 60mm actual) — a narrower board width creates a tighter, more refined joint pattern on walls and ceilings
Tongue-and-groove milling — interlocking edges align boards during installation and hide fasteners for a clean finished surface
Groove-S profile — the shaped groove between boards introduces a shadow line that adds visual depth without relief carving or additional trim
Three length options (1 ft / 5 ft / 10 ft) — ordering the length closest to your wall or ceiling run keeps waste low and cuts manageable

1'

292mm length suits accent sections, small benches, or filling awkward gaps without excessive cutting

5'

Mid-length boards balance handling ease with fewer end joints across a typical sauna wall run

10'

Longer boards span most standard sauna wall heights in a single piece, reducing visible end joints and installation time

Size & Weight

Dimensions

15 × 60 mm

Product Width

2.36" (60mm)

Shipping Length

Up to 10'

SHIPPING & DELIVERY

Sauna wood is not free shipping. Length, piece count, profile, and weight set the rate. These are the Bathing Brands contiguous-US flat rates. Canada is the same table plus $100. Alaska, Hawaii, and remote addresses are quoted.

Checkout charges the 8' piece-count table (contiguous US). Canada is the same table plus $100. Boards over 8' use that same checkout rate; dock or liftgate extras are a follow-up. Alaska, Hawaii, and remote addresses are quoted.

BOARDS UP TO 8'

Under 40 pieces generally ships FedEx Ground in cardboard. Over 40 pieces generally ships LTL with a liftgate on a wood pallet. The longest board in the order sets the rate tier.

Under 19 boards — $195
20–39 boards — $395
40–99 boards — $495
100–299 boards — $695
300–499 boards — $895
500–799 boards — $995
800–999 boards — $1,295

BOARDS OVER 8' UP TO 10'

These lengths ship LTL on a wood pallet. They do not qualify for a liftgate — you need a dock, machinery, or hand offload on site. Carriers allow about one hour to unload before extra fees.

Under 19 boards — $295
20–39 boards — $495
40–99 boards — $595
100–299 boards — $795
300–499 boards — $995
500–799 boards — $1,095
800–999 boards — $1,395

HOW THIS SHIPS

We pack for a safe arrival at the lowest rate that fits the order.
Boards over 8' carry a surcharge because long crates cost more to move than a standard skid.
Heaters, doors, or accessories on the same order can offset some of that freight.

Description

Features

Key Features

Thermally modified aspen — heat treatment stabilizes the wood dimensionally, so boards resist warping and checking through repeated sauna humidity cycles
1x3 nominal profile (15mm × 60mm actual) — a narrower board width creates a tighter, more refined joint pattern on walls and ceilings
Tongue-and-groove milling — interlocking edges align boards during installation and hide fasteners for a clean finished surface
Groove-S profile — the shaped groove between boards introduces a shadow line that adds visual depth without relief carving or additional trim
Three length options (1 ft / 5 ft / 10 ft) — ordering the length closest to your wall or ceiling run keeps waste low and cuts manageable

1'

292mm length suits accent sections, small benches, or filling awkward gaps without excessive cutting

5'

Mid-length boards balance handling ease with fewer end joints across a typical sauna wall run

10'

Longer boards span most standard sauna wall heights in a single piece, reducing visible end joints and installation time

What's Included?

Size & Weight

Dimensions

15 × 60 mm

Product Width

2.36" (60mm)

Shipping Length

Up to 10'

Electrical Specs

Shipping & Delivery

SHIPPING & DELIVERY

BOARDS UP TO 8'

Under 40 pieces generally ships FedEx Ground in cardboard. Over 40 pieces generally ships LTL with a liftgate on a wood pallet. The longest board in the order sets the rate tier.

Under 19 boards — $195
20–39 boards — $395
40–99 boards — $495
100–299 boards — $695
300–499 boards — $895
500–799 boards — $995
800–999 boards — $1,295

BOARDS OVER 8' UP TO 10'

These lengths ship LTL on a wood pallet. They do not qualify for a liftgate — you need a dock, machinery, or hand offload on site. Carriers allow about one hour to unload before extra fees.

Under 19 boards — $295
20–39 boards — $495
40–99 boards — $595
100–299 boards — $795
300–499 boards — $995
500–799 boards — $1,095
800–999 boards — $1,395

HOW THIS SHIPS

We pack for a safe arrival at the lowest rate that fits the order.
Boards over 8' carry a surcharge because long crates cost more to move than a standard skid.
Heaters, doors, or accessories on the same order can offset some of that freight.

Warranty

Documents

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Design

DIMENSIONS

Model: Thermo-Aspen Groove-S 1x3 T&G
Nominal size: 1x3 (15mm x 60mm)
Length per piece: 1', 5', 10'
Weight: 1–10 lb (0.45–4.54 kg)

MATERIALS

Species: Aspen
Finish: Thermally Modified
Thickness: 0.59" (15mm)

Brand Spotlight

Prosaunas

Built by Sauna Artisans

From Western Red Cedar to Himalayan salt, every material is chosen by our team of sauna artisans — because "Perfection in Sauna" is the standard we build to, not just a tagline.

Prosaunas

Everything Your Sauna Needs, One Source

Wood, doors, windows, lighting, salt, care products — Prosaunas outfits every detail of your build, backed by a nationwide dealer network.

Prosaunas

Real Experts, Real Answers

Questions about materials or installation? Our Wheeling, Illinois-based team is here Monday–Friday, and every build is backed by our workmanship warranty.

DELIVERY & INSTALL

Delivery

Assembly

Install

Delivery

Assembly

Install

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DETOXIFICATION

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Sweat is the safest and most natural way to expel the body's toxins. Practiced for thousands of years, sauna is still one of the most efficient ways to sweat on earth today.

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Extensive research has shown that exposure to cold and heat can effectively reduce inflammation, accelerating the recovery process and providing relief from pain.

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MENTAL HEALTH

Through breathing techniques you can learn to calm your nervous system in intense heat and cold. Breathing is the key to a racing heart and a racing mind.

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Whoop™ posted a study that showed a 2.5x increase in sleep consistency on days when people practice cold exposure. Learn how heat & cold to create better habits and deeper sleep.

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