Kodiak Thermo-Spruce deck


Use Thermory’s Kodiak range to create a particularly rugged and natural atmosphere. Its sturdy boards with their brushed texture were inspired by the Kodiak brown bear, ruler of the Alaskan forests, representing the harsh and wild charm of the local nature.

Like all Thermory products, the Kodiak range is also thermally modified using only heat and steam. Modified to the core, the boards are dimensionally stable and offer rot resistance for at least 25 years if correctly installed. Kodiak boards will grant you a natural and rustic feel and the first-class qualities of thermally modified wood.

Very good durability, beautiful knots and comfortable for your feet

Stylish and clean overall impression, easier to install

Spruce at its best

Accentuates the grain pattern of the wood

The wood becomes more durable and its moisture content decreases

Resistance to rot 25+ years

Wood from sustainable forests with chemical-free modification

Why choose our Kodiak decking boards?

  • If you prefer wood with a rustic and natural look but want premium durability at the same time, terrace decking made of Thermory Kodiak Thermo-Spruce is just right for you.
  • Wider-than-usual boards ensure extra fast installation with fewer seams, creating a stylish and modern feel.
  • The brushed top surface brings out the natural structure of the wood.
  • Unlike other softwood boards, Kodiak spruce boards show no visible sapwood thanks to the thermal modification process – just the consistent colour of heartwood from edge to edge.
  • Kodiak boards are so stable that we recommend installing them with PC clips.
  • Thermal modification makes spruce wood a wooden material of the highest durability class (class 1, 25+ years) that will adorn your terrace for decades to come.
  • Our thermally modified spruce is an environmentally friendly construction material as thermal modification uses no chemicals and creates no waste.
  • We offer thermally modified spruce that bears the NORDIC SWAN ECOLABEL. This means that the wood originates from responsibly managed forests, is free of chemicals and is extremely durable when used outdoors.


backwood kodiak

Additional options for flawless finish and easy installation

Flawless finish,
hidden fixings

Reduces waste,
saves expenses

Innovative and simple
fixing methods

Standard selection of decking boards made of Kodiak Thermo-Spruce:


Our standard products offer more flexible purchase volumes and shorter delivery times. The rest of our products are made to order. Request additional information on minimum quantities and delivery terms.

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Spruce is less resinous

Spruce (Picea abies or Nordic spruce) is a coniferous tree of the pine family in the genus Picea, widespread in Europe.
Without any treatment, spruce has almost white wood, is lightweight and soft and has medium mechanical properties. Spruce splits more easily than pine but it is less resinous. Spruce is very well-suited for thermal modification, becoming significantly more durable and stable thanks to this process and acquiring a beautiful golden brown tone.

  • Decking
  • Cladding

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.

Thermory Benchmark termokuusk


Deck maintenance To oil or not to oil?

Thermally modified decking boards do not necessarily require surface treatment, but regular maintenance and oiling will refresh the appearance of your deck and make it easier to clean.

  • We recommend cleaning and maintaining the deck before the start of the summer season.
  • Lightly sanding faded boards will remove the silvery surface colour and restore the wood’s original appearance.
  • If you would like to preserve or change the tone of thermally modified wood, apply UV-resistant oil to the boards once a year.
  • If you would like to preserve the tone of boards that have turned grey over time, use colourless oil without a UV filter on the boards.
  • The oil should be applied only to clean, level, dust-free surfaces.


Five recommendations for installing decking made of Kodiak Thermo-Spruce

The right installation techniques are extremely important to make your deck last a long time.

  • We recommend using joists of thermally modified ash or spruce of durability class 1 for the substructure. This way, the substructure will endure as long as the decking.
  • When installing thermally modified spruce decking, make sure that the heartwood side of the board faces down.
  • Choose the PC clip fixing to get a deck surface without screw holes and visible screws. View installation video (ENG)
  • By choosing decking boards with matching tongue-and-groove ends you can install boards of different lengths with the least possible time, material costs and labour input. The load-bearing capacity of the tongue on end-matched tongue-and-groove decking is verified and you do not have to join the boards directly over a joist.
  • Apply end wax to all ends of the decking boards before installation to ensure longer service life.

Follow the decking installation guide for correct installation.