Roof construction, load-bearing walls - help

[Diman]

Hello

I have bought a single-story house on a slab with a flat roof. The house is from '68 and has a wooden frame with a brick facade.

I have tried to get hold of plans without success, the municipality has none, after neighbors' tips about it "maybe being HSB that built it" and a call to HSB which had nothing, I'm left without plans.

So I tried to measure between walls etc., and draw the house myself, this is how it looks today.



I want to remove all interior walls and create a completely new layout.

There is no hatch for the roof space, so I tore down part of the ceiling - ugh treetex...
160mm beams, mineral wool, and some form of board on top, no vapor barrier.
So I sawed through it to stick up my head and check, this is how it looks (bad pictures, but I'll bring a lamp tomorrow and take more)

I don't see any roof truss-like structures, the thin vertical grids, I have no idea what their purpose is.




A double beam here with something that looks like filler




I have read that you should bring in a structural engineer to definitively say which walls are load-bearing, but I thought to check with you first just in case it's obvious.

Or are the beams between which the insulation sits what supports the whole roof?
And what is the board lying there, how is the insulation ventilated?
Many questions here

Dim

 

[justusandersson]

The roof construction suggests that the heart wall-like walls are load-bearing (horizontal in the drawing). The best would have been if you had drawn a section as well, so you could see the roof construction and walls simultaneously. If you want complete freedom in the floor plan, a system of columns and beams is required to take responsibility for the load-bearing.