Thermo-Aspen 3x3 Shiplap Post

Name: Thermo-Aspen 3x3 Shiplap Post
Brand: Prosaunas
SKU: WOOD703-1
Price: 13.67 USD
Availability: InStock

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Scandinavian Sauna Tradition, Refined

Thermo-Aspen is the wood of choice in saunas across Scandinavia — and Prosaunas brings that heritage to you. Carefully selected for straight grain, uniform texture, and a warm, rich hue, this premium Thermo-Aspen delivers a sophisticated look and a comfortable feel where it matters most.

The Power of Thermal Modification

This wood has been thermally modified through an organic process using heat, steam, and pressure — making it more dimensionally stable, more water-resistant, and far superior to untreated wood for resisting decay, pests, and harmful fungi. Aspen's naturally resin-free character means no sticky surprises, and no splintering underfoot or against skin in high heat.

A Profile Built for Comfort

Cut to 68 × 68 mm (292 mm length), this 3×3 S4SEE profile features four smooth sides with softened eased edges — a finish that's as gentle on bare skin as it is easy on the eye. Ideal for sauna benches and floors, every piece is held to the stringent selection standards Prosaunas has refined over more than 55 years of crafting premium sauna rooms across North America.

PRODUCT SHEET

PROSAUNAS Thermo-Aspen Sauna Wood Interior

Thermo-Aspen 3x3 Shiplap Post

Length Per Piece: 1' 1' 8'

Product variants

$13.67 USD

Freight added at checkout

Installation Required

This is raw structural lumber intended to be cut, positioned, and fastened as part of a sauna build. You will need standard framing tools and fasteners appropriate for thermally modified wood.

Description

Features

What's Included?

Size & Weight

Electrical Specs

Shipping & Delivery

Warranty

Documents

Description

Thermo-Aspen 3x3 S4SEE SHP is a structural sauna lumber milled from thermally modified aspen to a 68 mm × 68 mm profile. Thermal modification drives out moisture and reduces the wood's ability to re-absorb it, which means the timber holds its shape and resists the repeated swelling and drying cycles that are normal inside a sauna.

The S4SEE (Smooth 4 Sides, Eased Edges) mill finish gives all four faces a consistent, splinter-free surface straight from the package — important anywhere the timber will be handled or left visible. We offer this profile in both 1-foot and 8-foot lengths so you can source the right cut for framing, blocking, or structural elements without generating unnecessary off-cut waste.

Key Features

68 mm × 68 mm (3×3) thermally modified aspen — thermal modification stabilizes the cellular structure so the timber resists the moisture cycling common in sauna environments
S4SEE mill finish (Smooth 4 Sides, Eased Edges) — all faces arrive ready to use without additional sanding, and eased edges reduce the risk of splinters during handling and installation
Structural profile suitable for framing, blocking, and load-bearing sauna applications where dimensional stability matters
Available in two lengths — 1 ft and 8 ft — letting you match material to your specific framing layout and minimize waste

1'

292 mm length — sized for blocking, short-span framing members, and detail work where a full-length board would require cutting

8'

8-foot length — suitable for primary framing runs and structural members that span a standard sauna wall or ceiling without a mid-span joint

Size & Weight

Dimensions

68 × 68 mm

Product Width

2.68" (68mm)

Shipping Length

Up to 8'

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

68 mm × 68 mm (3×3) thermally modified aspen — thermal modification stabilizes the cellular structure so the timber resists the moisture cycling common in sauna environments
S4SEE mill finish (Smooth 4 Sides, Eased Edges) — all faces arrive ready to use without additional sanding, and eased edges reduce the risk of splinters during handling and installation
Structural profile suitable for framing, blocking, and load-bearing sauna applications where dimensional stability matters
Available in two lengths — 1 ft and 8 ft — letting you match material to your specific framing layout and minimize waste

1'

292 mm length — sized for blocking, short-span framing members, and detail work where a full-length board would require cutting

8'

8-foot length — suitable for primary framing runs and structural members that span a standard sauna wall or ceiling without a mid-span joint

What's Included?

Size & Weight

Dimensions

68 × 68 mm

Product Width

2.68" (68mm)

Shipping Length

Up to 8'

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 3x3 Shiplap Post
Nominal size: 3x3 (68mm x 68mm)
Length per piece: 1', 8'
Weight: 1–8 lb (0.45–3.63 kg)

MATERIALS

Species: Aspen
Finish: Thermally Modified
Thickness: 2.68" (68mm)

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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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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IMPROVED SLEEP

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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HEART HEALTH