Durable wood, "native" terrace decking

is the thermo-pine?

20 years is little once they're over ... :p
But normally one would probably have to reckon with an even shorter durability.

For oak - which is one of our most durable woods - I quickly found the following entry: lifespan: 10-15 years

.... what now (when researching) "bothers" me a bit is the lower stability of thermo-treated wood. The distance between support points should not be over 50 cm. (little is said about the thickness/strength of the wood regarding thermo-wood ...)

Has anyone already installed this "among us" and can report?

Thermo ash over almost 10 years. Apart from graying, no signs of failure. It was still like new when moving out. Super hard - please pre-drill, the wood is brittle. A 60mm spacing was sufficient for something around 25mm thickness as well.

The "Dauerholz" people seem to no longer exist ... the website is "temporarily unavailable" and a phone number I have is "unknown".

The "Dauerholz" people don't seem to exist anymore ... the website is "temporarily unavailable" and a phone number I have is "unknown".

I had noticed that too, which is not exactly a good sign.
Why don't you just use the raw wood as a surface, like they do in Scandinavia, the Alps, or elsewhere. Anything you do to it would not be ecologically sensible per se, whether oil, wax, or any other treatment.

Wax is less ecological than no wax. You are (unfortunately) probably right about that.

For me, a crucial criterion is whether materials remain in the "natural cycle" (unlike plastics).
Wiki says: Stearin (which is in Dauerholz) is made 100% from plant-based or animal-based, and thus renewable raw materials and can – unlike paraffin from petroleum – ideally be considered CO2-neutral.
However, they then limit this because stearin can be produced either from plants or from petroleum ...
Whether it is "toxic" to the environment is not clear to me, but it does not sound like it.

An alternative to wood is a material that is supposedly "wood-concrete," which is made waterproof on the top side with plastic. With that, I might (perhaps) never have repair work again in my life ...
But I only like that out of laziness ... visually and in terms of feel only very limited.

... and: yes, you are also right that it makes sense to look around at how other people in the world solve the problem ... :cool: