Spiral staircases (large radius without central upright) and spiral staircases (small radius attached to central upright) are complex custom-made products from carpentry, joinery or carpenter’s workshops that require a lot of expertise.
Spiral staircases made from “one cast” are either bent or assembled from numerous individual parts.
The stair construction should be as self-sufficient as possible from the tree and only be supported by the tree at a few points (with wooden struts).
We advise against the method of screwing each individual step into the living tree!
this technique is no longer professional: “professional tree house construction” means as few injuries as possible. This is the general opinion of professional treehouse builders worldwide (see “World Treehouse Conference”).
Screwing step by step one by one into the tree is what we did as ignorant children
many small injuries and many individual pressure points mean stress for the tree
Each of these steps can deform individually, making stair climbing unpleasant and dangerous.
For do-it-yourselfers, the construction of a spiral staircase is suitable – as always, you can find instructions on YouTube.