Thermo Ash Decking

Do you prefer wood from local forests to hardwoods? And at the same time, you have high requirements for the durability? Thermowood is produced through a modern process, which makes the wood even more durable and dimensionally stable without the use of chemical additives. Under the influence of steam and temperatures of over 170 degrees Celsius, the cell walls of the wood are changed so that they can hardly absorb any more water. Another advantage: through this process, the wood obtains a beautiful, dark brown colour.


  • Durability class 1-2 (very durable)
  • Thanks to thermal treatment, resistant to mould and fungal attack
  • Fine cracks possible in the surface
  • Practically knot-free
  • Differences in colour emphasize the natural character.

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For our Thermo Ash timber decking, you can choose from various surfaces.


Osmo T+G decking is available in all wood species. An especially designed tongue and groove connection allows a continuous installation of boards.

  • Quick and easy
  • Less scrap
  • Random laying patterns possible
  •  High stability

Smooth surfaces are currently in fashion. So those distrubing screw heads do not stand in the way of the calming appearance, Osmo has the right solution:

  • Decking clipper for softwoods
  • TeNi Clip/ SenoFix for Thermo Ash
  • Specialized fixing system for Multi-Deck 

Here you can find our accessories developed specifically for Thermowood.

Thermowood Decking Accessories



The lifetime of a deck depends significantly on the correct installation and whether it is suitable for wood. With accessories from Osmo, you are always on the safe side. All accessories are perfectly geared to each other so that your new decking seems to install itself.

Timber Decking Accessories


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