Removing interior wall under mansard trusses, load-bearing?

[DaHooF]

I am renovating an old house built in 1940. After some brainstorming, we decided to remove an interior wall between 2 rooms on the upper floor. The question now is whether this can be done. The roof trusses are what is called a mansard or broken truss. As far as I understand, these trusses should essentially be self-supporting, have I misunderstood? The wall we plan to remove is made of standing heavy timber, I guess about 100mm thick and positioned 90° angled to the trusses. We are planning to make an opening of about 2400mm. So the door on the right in the picture will be removed and all "logs" up to the last 2 on the left. We will not tear down the entire wall, just make a larger opening. Do you think this can be done without reinforcement? I should also add that the rest of the house's inner and outer walls consist of the same type of timber logs, so it is quite solidly built.

 

[noone70]

Do the rafters rest directly on the wall or is there roof decking in between? If the roof decking goes between the wall and the rafter, it's most likely not load-bearing. I would probably get a structural engineer to look at it in any case. Additionally, a building permit is required if you intend to alter load-bearing parts.

 

[DaHooF]

The roof trusses, or rather the collar beam in the trusses, rest on the longitudinal horizontal beam at the top of the image. The roof boards do not continue to the other room.

 

[mulpac]

The wall we plan to remove is made of standing heavy timber, estimating about 100mm thick and is positioned at a 90° angle to the roof trusses. The roof trusses or rather the collar beam in the roof trusses rest on the longitudinal lying beam at the top of the image. The roof boards do not continue to the other room.

Quite a lot suggests that this may be a so-called "hjärtvägg" and that in such cases some form of load support is required, such as a beam underneath or more rafters in the truss if the wall is to be removed.

 

[DaHooF]

Thanks for the quick reply! It will probably be the case that we leave the wall intact and maybe widen the doorway by 10-20 cm and increase the height so I don't constantly bump my head on the frame.