Choice of beam size for custom-built house

[Cson]

According to information I received from my truss manufacturer, 45x70 cannot be used in load-bearing wall constructions, but at least 45x95 is required. However, maybe that's wrong?

Yes, that's wrong :

 

[Tommy_S]

It depends on the loads present, how closely you set the studs, wall height, etc.

There is no general prohibition against 70mm load-bearing walls. However, I have never built one.

 

[Torparkungen]

Hello!
I listen and observe...
I will have 45x95 in my walls myself. All on the ground floor, to get as solid a feel as possible without overdoing it. By the way, I've also heard that 45x95 studs at c-c 600 should be suitable for load-bearing interior walls in a 2-story house.
I will also nail raw cladding inside the plasterboard on certain walls. I can hardly wait!