I have a 100-year-old log 1½-story house with about +40m² on the ground floor with a kitchen and living room. There is a chimney in the middle of the house. I believe it's a very common house type (at least in the Mälaren Valley). We are going to replace part of the bottom sill as it is water-damaged. We plan to pour a concrete slab with underfloor heating, as we already need to remove the floor/insulation to access the sill. It would be great to have a single open space on the ground floor. So my question is whether I can remove the chimney and wall. How can I solve ventilation in the best way? To find out if the structure rests on the chimney, do I need to tear down the ceiling/floor (upstairs) or is it enough to open from one side, and which is preferable, or does it only depend on what I find most convenient? If there are parts resting on the chimney, can everything be resolved in another way, or are there certain constructions where it's not possible or worth attempting to resolve?
