Going home after work to do some more measuring, but I think the post might fit without being in the way, so I can avoid tearing up the whole roof.

Thanks for the help!!!
 
What will the pillar stand on the floor below? Could it be worth tearing down a bit more ceiling to avoid the post?
 
It will go almost right up against the pillar of the staircase. So it will look like the staircase has two pillars instead of one. And the staircase is at the end of a hallway, so you will never walk past the pillar.
Updated the picture a bit.
Blue lines are interior walls in the basement.

It will be a bit cramped if you need to crawl under the staircase, but the space is so small that it’s not a problem.
 
  • Diagram of basement staircase with blue lines indicating inner walls, a post near the stairs, and notes about limited space under the staircase.
What is the steghöjd?
 
The step height will be 2380mm, max for the chosen staircase,
There is a ceiling height of 2 m in the basement and 39cm floor structure including flooring. So, 10 steps. The first step will be one extra cm.
 
Then you have to turn the stairs slightly in relation to your sketch. About a 180-degree opening is sufficient.
 
Have started cutting now.. the rule is a bit brittle the bottom 25%. Should I stabilize it on top of the post?
 
  • A brittle wooden beam partially cut, resting atop a wooden post with a metal bracket; showing wear and needing stabilization.
I wouldn't say it's brittle, it's affected in some way. It looks like an old rot damage, but it could also be something else. It won't work to place it on a post as it is. The damaged part needs to be replaced, which is not entirely straightforward when it comes to a loaded beam. I tend to think it's better to hang the beam on a supporting beam using proper metal fittings.
 
A bit of a late response. The post is in place and nothing has collapsed so far.
Carved away the damaged section which was about 3-4cm at the bottom of the beam and placed the post there on stable wood, then reinforced with solid flat iron and angle iron on them. Let's hope it holds. :)

In connection with this, I tried to lift the beam with a jack and it required about 500-800kg, so there isn't a great deal of weight on it.
 
I estimated 500 kg, which was therefore on the low side.
 
It's a bit difficult to say exactly, there's nailed plank flooring and then chipboard and on top of that parquet. Additionally, there's a screwed plank ceiling underneath. So when I lifted, I was also pulling along the surrounding construction. So 500kg is probably a maximum since I lifted it over the existing position. But there's a relatively large contact area (95x95 plus angle iron) so it would be a maximum of 5kg/cm2, probably down to 3kg/cm2.

I'll check back when the kids have had their first party at home and see if the joists have started sagging then :rofl:
 
What is the pillar standing on at the bottom?
 
Concrete floor in the basement.
Drilling samples show approximately 15cm thick. Surface area approximately 20x20cm
 
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