Thermally modified oak – exclusive hardwood with inherent beauty and sophistication

Thermally modified oak is a premium hardwood species that is part of our Benchmark series. Attractive brown cladding is designed for those seeking nothing less than the best in quality and style.

Thermo-oak features the same superior durability as thermo-ash. Distinctive, delicate rays on the wood’s surface create a unique and characteristic look, delivering real wood aesthetics and unrivalled charm that no other material can match. The oak cladding gives the walls an elegant and timeless finish that will retain their noble appearance as the wood ages gracefully.

Thermory Red oak cladding
Application: Cladding
Species: Thermally modified oak
Modification level: Intense
Use: Exterior, interior
Durability class: 1 (25+ years’ protection against wood decay)
Finish: Unoiled
Texture: Smooth
Installation types: Visible, hidden
Installation methods: Screws, clips, PaCS Clad

Knot-free cladding with the highest available durability class

knot_free wood


An even, aesthetically pleasing look and feel


Thermally modified wood is more durable with a lower moisture content


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


Wood sourced from sustainable forests with chemical-free modification

red oak interior cladding

Why choose Benchmark thermally modified oak cladding?

Our Benchmark thermo-wood cladding board series stands for simplicity and natural wood aesthetics. Heat-treated oak is a unique and innovative addition to complement this product range.

Oak is a high-quality hardwood valued for its exceptional properties. Our thermal treatment enhances these qualities even more, assuring the first-class durability and dimensional stability of Thermory cladding and decking boards—the properties that are crucial in outdoor applications.

The attractive reddish-brown tint and natural surface checks make thermally modified oak an appealing cladding and decking solution for those who cherish the inherent beauty of natural wood. Oak cladding gives an exquisite and timeless finish to exterior walls, retaining the elegant look even as the wood ages. Exceptionally weather-resistant and durable, oak decking boards are built to last

Thermory heat-treated oak has the highest durability class and rot resistance for 25+ years.

Oak ages beautifully. If left untreated, oak will eventually take on a silver-grey tone without losing its durability. Maintenance of your deck or cladding has never been easier.

Thermally modified oak is suitable for both exterior and interior use.

Read more about thermal modification

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

Oak is characterised by beautiful, clear wood grain

Oak (Quercus rubra) is native to North America. This abundant species is characterised by beautiful, clear wood grain and a slightly pink undertone. Distinctive and delicate open rays on the wood’s surface enhance its natural beauty and create a unique and characteristic look that no other material can match.

Because of its density, strength and durability, red oak is widely used timber in North America. The tree has a straight trunk, fewer branches and low internal stress. The latter is particularly important since it ensures that even the long decking and cladding boards remain dimensionally stable and resistant to warping and cupping throughout the products’ lifespan.

The color of the wood changes over time

Thermal modification gives oak an exotic deep brown color. As with any wood, the surface of thermally modified oak will fade to a natural silver-gray color 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’re exposed to. The durability of the boards is not affected.

Thermory Red oak cladding

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. 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.

Four recommendations for installing Benchmark cladding

To make your paneling last as long as possible, it’s extremely important to use the correct installation techniques.

Choose PaCS Clad, B1-1, T6, Tiga or Dekora clip fastenings to create a façade without any visible screw holes or screws.

If you decide to use screws when fixing the cladding, we recommend pre-drilling the screw holes in the boards to avoid splitting the wood with the screws.

By choosing cladding boards with end-matching, you can minimize time, labor and material costs when installing boards of different lengths. With end-matching, the boards don’t necessarily need to meet directly over a joist.

Download cladding installation guide

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