Bearing question

[vix79]

Hello!

I'm pondering about the walls.
The house is a split-level house built in 1970.
Concrete slab, raised floors and the walls on the upper floor are about 10 cm empty and weak, it might be necessary to lift up the entire floor and then the walls go, could the longitudinal ones be load-bearing…? I believe it’s a self-supporting roof, what do you think?

Same question for the lower floor, the wall in the middle is seen on the section drawing as load-bearing, these walls that I am pointing to are made of blue concrete 8 cm and the intention is to demolish and replace them with lightweight concrete or steel profiles + plasterboard.
They aren’t load-bearing, are they?

Grateful for an answer!!

 

[BirgitS]

Concrete floor slabs, raised floors, and the roads on the upper floor are about 10cm empty and weak, might need to lift up the whole floor and then the walls may need to go, could the longitudinal ones be load-bearing...? I believe it's a self-supporting roof, what do you think?

Probably the roof is self-supporting because it states it's trussed rafters. However, there was a period when the dimensions were a bit too weak, causing some roofs to collapse when heavy wet snow came. After that, the calculation norm changed, but I don't know when this happened. A structural engineer can check the trusses' dimensions based on the roof weight, snow zone, house width, etc. Then, a few decades have passed and the house may have settled, which could have resulted in a load on the interior wall under the roof ridge. If such an interior wall is removed, the ceiling will bend downwards. The same applies to the basement level. There, it's also true that interior walls that run 90 degrees against an exterior wall, which is against soil, prevent the soil masses from pushing the exterior wall inward.