Rugged yet refined spruce cladding

Thermory’s Kodiak cladding range can be used to create a particularly rugged and natural atmosphere. Its sturdy boards, with their brushed texture, are inspired by the majestic Kodiak brown bear and represent the harsh, wild charm of the Alaskan forests, its natural habitat.

The Kodiak range is made with spruce that has been thermally modified using only heat and steam. Modified right through to the core, the boards are dimensionally stable and offer rot resistance for at least 25 years if correctly installed. Kodiak boards provide a natural and rustic feel alongside the first-class qualities that come with thermally modified wood.

Application: Cladding
Species: Thermally modified spruce
Modification level: Intense
Use: Exterior, interior
Durability class: 1 (25+ years’ protection against wood decay)
Finish: Unoiled
Texture: Brushed
Installation types: Visible, hidden
Installation methods: Screws

Highly durable cladding with beautiful knots



A clean, stylish look with easy installation

Thermory wood distinctive_knots


Showcasing the natural beauty of spruce

Thermory brushed wood


Highlights the wood’s natural grain



Thermally modified wood is more durable with a lower moisture content

Thermory cladding durability


Thermory’s thermo-spruce cladding has the highest available durability class



Wood sourced from sustainable forests with chemical-free modification

Why choose Kodiak thermo-spruce cladding?

If you prefer rustic, natural-looking wood but you need premium durability, Thermory Kodiak thermo-spruce is the perfect material for your façade.

Extra-wide boards ensure fast installation with fewer seams, creating a stylish and modern look and feel.

The brushed visible surface accentuates the natural appeal of the wood grain.

Thermal modification gives spruce the highest durability rating (class 1, 25+ years) so your façade will look great for decades.

The wood’s reduced moisture absorption capability and rate from thermal modification results in less moisture-induced deformation.

Because they are so stable, we recommend installing Kodiak boards with PC clips.

We offer thermally modified spruce with the Nordic Swan Ecolabel, which certifies that the wood originates from responsibly managed forests, is free of chemicals and is extremely durable when used outdoors.


Additional options for easy installation and a flawless finish



An attractive finish with no visible screws

Thermory endmatching


Reduces waste, saves expenses

Thermory easy installation


Ingeniously simple fixing methods


Spruce produces less resin

Norway spruce (Picea abies) is a coniferous tree of the pine family in the genus Picea, that is widespread in Europe.
Without any treatment, spruce wood is lightweight, soft and almost white in color with medium mechanical properties. Spruce splits more easily than pine but it is less resinous. The wood is very well suited for thermal modification, which makes it significantly more durable and stable while also giving it a beautiful golden-brown tone.


The tone of the wood changes over the course of time.

Thermal modification makes the tone of spruce wood a beautiful golden brown. A brushed finish will further highlight the depth and pattern of the wood.

As with any other wood, the surface of thermally modified spruce will acquire a natural silver grey colour over time. This process starts immediately after the products are installed and can take a few months to several years depending on how much UV light they are exposed to. The durability of the boards is not affected.


Wall cladding maintenance To oil or not to oil?

Thermally modified wall cladding does not necessarily require surface treatment. However, if you would like to preserve or change the tone of thermally modified wood, we recommend oiling the boards before installation using UV-resistant oil and repeating the oiling process every 3 years. The oil should be applied only to clean, level, dust-free surfaces. Before applying oil to the whole cladding, test it on a small piece of wood using a small quantity of oil. Observe the oil manufacturer’s instructions.

Three recommendations for installing Kodiak Thermo-Spruce wall cladding

For the substructure, we recommend using joists of thermally modified spruce of durability class 1. This way the substructure will endure just as long as the panelling itself.

By choosing wall cladding with matching tongue-and-groove ends, you can install boards of different lengths with the least possible time, material costs and labour input. Any two boards do not necessarily have to meet directly over a joist.

When using screws for installation, screw heads must not be forced too deeply into the wood. The screw heads must be almost flush with the wood surface to avoid water penetration.

Download cladding installation guide

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