Mansard roof load-bearing interior wall?

[Topptur]

Hi everyone,
I'm going to knock down the wall against the attic space to get more area, but I'm a bit concerned whether the wall might be load-bearing. I'm attaching some pictures so maybe you can help me along the way.

thanks in advance // Felix

 

[SågspånPappspikEternit]

In my humble opinion (and experience), that attic wall is load-bearing, it clearly looks like it. I myself live in a house with a mansard roof.

 

[Topptur]

Okay, I understand.
I'm a bit puzzled as it doesn't seem like there's tension in the timret and it's not lying flush against the hammarbandet.

 

[SågspånPappspikEternit]

Now I'm being really annoying here, but considering that you call the standing 3-inch plank "timber" and also mention "hammarband" in connection with an interior wall, it makes me think there's some language confusion here.
If you doubt what I'm writing about the load-bearing function of the kattvind walls, it's best to contact a carpenter within your circle of acquaintances, who can come and take a look on-site and make an assessment.

 

[SågspånPappspikEternit]

Okay mister. An interior wall can still have a syll and a hammarband? How would you name them?

I am not usually addressed as mister .
"Väggband" I think sounds better.

 

[BirgitS]

If you doubt what I write about the load-bearing function of the attic walls, it's best to contact a carpenter you know, who can come and look at the site and make an assessment.

I recommend a structural engineer who is truly trained in strength and similar matters.

 

[Topptur]

Yes, it will probably have to be like that, two carpenters have not been able to determine, one didn't think it was load-bearing, the other thought it was.

 

[Johneyoo]

Yes, it will probably have to be like that; two carpenters haven't been able to determine whether one thought it wasn't load-bearing, the other thought it was.

Did you come up with anything sensible? Like the dimension of the bearing beam? I'm in the same position myself and want to open up towards the kattvind.

 

[Topptur]

Did you come to any sensible conclusion? Like the dimension of the beam? I'm in the same situation myself and am going to open towards the kattvind

Hi, sorry for the late response. I propped up with a 90x90 post on each side.

 

[BirgitS]

Did you come to any sensible conclusions? Like the dimension of the support beam? I'm in the same situation myself and need to open up towards the attic space.

The dimensions needed for a roof truss support beam depend on many factors such as snow load zone, roof pitch, roof weight, current dimensions, etc., so you can't just do what someone else has done without knowing everything is the same.

I suggest you start by understanding how a roof truss looks and functions: https://www.byggahus.se/sa-fungerar-en-takstol
"A common issue encountered in the Byggahus.se forum is the desire to move the support struts sideways (to create larger or smaller attic spaces) or remove them entirely. The simple answer is that this, in most cases, requires reinforcement of the upper chord. A fully possible measure but usually with extensive consequences, as large parts of the attic roof need to be removed."
The work requires a well-informed structural engineer and often an approved building permit.

 

[BirgitS]

Hi, sorry for the late reply. I propped up with a 90x90 post on each side.

Should I interpret that as you now have trusses without support posts and that haven't been reinforced to handle it either?

 

[Topptur]

Should I interpret that as you now having roof trusses without support legs and that haven't been reinforced to handle it either?

You can be at ease. I've had a structural engineer on site.