With this post I would like to document and share a very handy and useful woodworking technique that I had never seen applied before: I just figured it out on my own... solving the problem of working with a living element like wood that keeps always it's own Soul alive even if it is apparently perfectly machine-cut.
In order to complete the wooden floor that lays on top of those lovely logs that I levelled few months ago, I just applied and perfected the reverse concept of the method explained to handle (straightening and fixing) tapped boards... and using even thicker boards (32mm on top of those 20mm boards of the ceiling).
The top boards lay about 3 degrees off the alignment with the lower ones so that the two layers tighten each other up in groups of 4 or 5 boards across the whole length of the room.