The four walls that extend from the chimney in the floor plans I would assume are load-bearing until proven otherwise. That's often how they built in the past. Perhaps all or some of them are built a meter out from the chimney, as in my house, so that heat from the chimney stack would warm the rooms.
In the basement, it looks a bit different, but the two walls that run all the way from left to right in the basement seem sturdier, and I assume they are built like the one that connects both in the middle, by the chimney.
In the basement, it looks a bit different, but the two walls that run all the way from left to right in the basement seem sturdier, and I assume they are built like the one that connects both in the middle, by the chimney.
If you follow the drawing, especially section A-A, all walls running from left to right on the drawing are load-bearing. Houses with plank frames were often built somewhat haphazardly, so you can't rely on such information. One way to check is to study the direction of the floor joists. Either with the help of a stud finder or by looking at how the floorboards are laid. In a plank house, non-load-bearing walls are often stabilizing, so you can't just remove them randomly. Often, certain pieces need to be left in place.
Then what I wrote in post #3 applies.
The bracing of the outer wall is sensitive. Similar to log houses, the partition wall can also be integrated into the outer wall. If you remove a non-load-bearing partition wall, there might be a missing floor joist where the wall is situated. You should not entrust carpenters without experience in plank frames to work on the house.
