I have a house built in 1904 that used to be a shop. In 1970, the heart wall was removed and a load-bearing structure was added in the attic. The house is 14x9 meters, so it's no small beam. Now the facade is starting to give way and the roof is beginning to sag. So it's time to put up a new load-bearing wall. The distance between both the floor and ceiling joists is about 1 meter; we were thinking of a center-to-center distance of 600. This means that the load-bearing beam will not rest on a joist. The question is, what dimensions are needed for the sill and the one in the ceiling? Is 2 pieces of 120x45 standing side by side and 90x45 as a load-bearing beam sufficient?
 
Wow, cool! :surprised: 9 m cantilever(?) beam!
Do you have any pictures? They usually help a lot so those who know can figure out where to start.
What is the height of the bearing wall? (floor to ceiling)
I further assume that the supports for the bearing wall under the floor (foundation/basement?) haven't been removed?
Pictures or drawings of how and where the roof and walls are starting to give in would also be informative.
 
The demolished heart wall was 14 meters long. The ceiling height is 2.70. The heart wall in the basement remains.
Wooden beam in an attic space, showing an incomplete support structure. There's clutter and cardboard boxes on the floor, indicating renovation work.
Picture of the beam. I think they were made earlier than 1970; then they should have used glulam.

Interior view of an attic with visible beams, insulation, and an exposed beam that has been altered, related to structural integrity concerns in a renovation.
The fool who previously owned the house cut the beam to build a bathroom. To replace it, he placed a batten next to it, but it's not resting on anything.
Interior view of an attic with visible beams, insulation, and an exposed beam that has been altered, related to structural integrity concerns in a renovation.

Last night the bathroom floor started to slope the other way. I've put in solid props today. A dimly lit basement showing a partially demolished wall and debris, with exposed beams and a person inspecting the area in orange work pants.
 
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It is almost hopeless to get a complete picture just by using different photos. Make a simple floor plan with main measurements and indicate where the different photographs were taken.
 
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