Sauna Timber Cladding & Walls

Transform your sauna with Finnmark’s premium collection of sauna claddings, thermally modified wood battens, wall timber, wood trims, and bench kits. Featuring sustainable, durable timber sourced from trusted Nordic and Baltic suppliers, our range offers everything you need to build your dream sauna, including cladding, mouldings, treatments, and feature wall panels. Perfect for DIY projects or bespoke sauna installations.

All Finnmark sauna timber is FSC®-certified and responsibly sourced, meticulously crafted to ensure exceptional quality. Our thermally modified timber undergoes a chemical-free heat treatment process that fundamentally transforms the wood's properties, enhancing dimensional stability, moisture resistance, and durability. This process creates a richer, deeper colour whilst reducing resin secretion, making these timbers perfect for both home and commercial sauna installations where longevity and low maintenance are paramount.

Looking to learn more about sauna wood? We've created a dedicated guide titled 'Best Wood for Saunas (& Why)'

Personalise Your Sauna with the Right Timber

Create your perfect sauna with Finnmark’ premium collection of sauna woods, thermally modified battens and trims. Our sauna wood types have been carefully selected from trusted Nordic and Baltic suppliers and are the ideal foundation for your dream sauna. From battens to sauna cladding, mouldings, bench timber, ventilation covers, and wooden feature wall panels, we offer a complete range of high-quality components to build your sauna from scratch. 

 

Everything You Need for Building a Sauna


Thermo Pine Sauna Battens: Ensure proper ventilation and moisture control in your sauna with high-quality thermo-treated sauna battens. Designed to create a crucial air gap between sauna cladding and insulation, these battens improve airflow, prevent moisture buildup, and enhance the longevity of your sauna structure.

Sustainable: FSC®-certified wood is responsibly sourced and meticulously crafted to ensure exceptional quality.

Versatile: We offer multiple sauna wood types and profiles in a range of dimensions to suit your sauna design. Finnmark’s collection of sauna woods is ideal for a DIY-sauna project or a bespoke home sauna installation.

Durable: We have carefully selected wood types that excel in the heat and humidity of a sauna environment. Finnmark’s collection includes naturally thermo- treated timber, where heat and steam are used to enhance the wood’s dimensional stability and resistance to moisture damage.

 

Grading Rules for Finnmark's Collection of Sauna Wood Types

Aspen & Thermo Aspen

Alder & Thermo Alder

Thermo Spruce

Thermo Pine

Thermo Radiata Pine

Thermo Magnolia

 

Choosing Your Sauna Cladding

Your choice of cladding depends on your personal preference, space, and desired visual impact. Whether you're looking to create a traditional or modern aesthetic, our sauna wood cladding is designed to meet all your interior and exterior needs.

Internal sauna cladding has a large impact on how your sauna room will look, smell and feel, while external cladding ensures a pleasant overall appearance along with resistance to outside influences including harsh weather and destructive wildlife. We offer various cladding widths which can be selected to perfectly fit the size and style of your sauna. Your cladding choice will depend on the sauna space, perspective and visual interest.


Choosing The Right Timber Species & Profile For Your Project

Choosing your panels is all about your personal preference. Finnmark provides a range of styles and sauna wood species to fit the atmosphere and interior you wish to create. When it comes to timber cladding thickness it is imperative to only use cladding boards that are at least 14mm thick. It’s the minimum thickness allowed by law in Finland, and for good reason: cladding thinner than this will invariably warp and become damaged within the sauna’s harsh environment.

The sauna bench wood must be resilient and approx. 28mm thick. Our sauna bench timber comes in SHP-profile.

As for the width of your sauna timber, Finnmark primarily supplies four sizes for the cladding: 90mm, 120mm, 140mm, and 160mm. The sauna bench wood is available in widths from 20mm up to 160mm.


Finnmark offers the following comprehensive range of sauna cladding options:

Kallio

STS4

STP

Finnmark exclusively offers the following specialised ranges of sauna cladding options:

STEP

VALEURA

KYTE

SRP

VIRE

ROMBTO

Select your cladding with the full room build in mind; combine it with sauna vapour barrier systems to control moisture and specify sauna airflow design so fresh-air intake and extract remain clear behind the lining. Align finishes by choosing bench timber for saunas that matches species and profile. 

Confirm the heat source early – electric sauna heaters or wood-fired sauna stoves – as clearances and vent layout differ. For added efficiency, install a digital sauna controller for precise temperature and scheduling. Finish your build with undercut sauna doors to support make-up air and specialist sauna lighting positioned away from airflow paths.

What types of wood are available for sauna cladding and trims?

Finnmark offers a variety of sauna woods, including Aspen, Thermo Aspen, Alder, Thermo Alder, Thermo Spruce, Thermo Pine, Thermo Radiata Pine, Dark Thermo Alder and Thermo Magnolia. Each wood type offers unique aesthetic and durability benefits.

What is the advantage of thermo-treated wood for saunas?

Thermo-treated wood is heat-treated to enhance its dimensional stability, durability, and resistance to moisture. This makes it perfect for sauna environments, where humidity and high temperatures can cause damage to certain timber species.

Can I use Finnmark’s sauna wood for DIY projects?

Yes, Finnmark’s sauna woods, trims, and bench kits are ideal for DIY sauna installations. Our collection offers a wide range of sizes and styles that can be easily adapted to your design needs.

How do I maintain my sauna wood?

Sauna wood can be easily maintained with regular cleaning and the use of specially designed sauna cleaning products. We recommend using sauna-safe paraffin oil and treatments to keep the wood looking its best.

Do you offer custom sauna wood options?

If you have a specific wood type or design in mind, our specialists can work with you to find the perfect match for your sauna.

How do I install my sauna wall cladding?

- Ensure the sauna framework is insulated and has proper vapour barriers.

- Attach ventilation battens – Fix them horizontally to create airflow behind the cladding.

- Install cladding panels – Start from the bottom, fixing each panel with hidden nails or clips. Stainless steel brad nails or staples are ideal as they provide the best durability in the extreme heat and humidity of the sauna environment.

- Allow for expansion – Leave small gaps to accommodate wood movement due to heat and humidity.

- Finish with sauna treatment – Use sauna-safe paraffin oil to enhance durability.

Do I need to use battens when building a sauna?

Yes, we would strongly recommend using specialist battens for the wall and ceiling build-up. Using battens is essential for proper ventilation and moisture control. High-quality thermo-treated sauna battens create a crucial air gap between the sauna cladding and insulation, allowing improved airflow and preventing moisture buildup. This helps protect the structure from damp-related damage, enhancing the longevity of your sauna. Proper ventilation also ensures a more efficient and comfortable sauna experience.

Everything You Need