I have a Myresjöhus model with a split-level plan and I'm planning to install a wood-burning stove (175kg). I also need to build up the chimney on the ground floor for aesthetic purposes. I'm considering using lightweight concrete blocks, which will increase the floor joist load by approximately 200 kg. It should be fine, but I wonder if anyone has experience with load values for floor joists? 
cool: The lightweight concrete blocks will also be fastened to the chimney, which should provide some relief from the floor joist load.)
cool: The lightweight concrete blocks will also be fastened to the chimney, which should provide some relief from the floor joist load.)