How do you solve this stair puzzle?

[justd3t]

We have just bought an apartment where there is currently a "less child-friendly" staircase. We will renovate the loft so that where the staircase currently connects, there will instead be a wall. The dream would be to install an L-shaped staircase (green). Now to the big problem, there is a substantial beam (pink) in the way that the "roof supports" rest on. My thought is to restore the "supports" to the ceiling to their origin and go up with a staircase between them. But will the rest of the loft have full load-bearing capacity in such a case? Who knows about such things?
Is there any other good suggestion on how to solve the staircase puzzle? A spiral staircase is currently the hottest option, but I would really love to have an L-shaped staircase.

The hole today is 1750×1400.
The staircase must connect at the top to the same wall the picture is on.

In the picture where I've marked in yellow is where I imagine opening up the beam.

 

[Åsa Lund]

I would have kept that staircase and partially closed the joist so that it is possible to place braces from the steps upwards with 100 mm spacing between them.

 

[4774]

Agree with Åsa. Don't really understand the problem.

 

[justd3t]

The stairs cannot connect where it connects today. It needs to be rotated 45 degrees, and then the entry into the stairs would be in the middle of the white post. So it is not a solution.

 

[4774]

The stairs cannot connect where they connect today. They need to be rotated 45 degrees and then the entry to the stairs would be right in the middle of the white post. So that's not a solution

Aha, that explains it 😀 but unfortunately, I'm not technically knowledgeable enough in construction to be able to answer. It feels like if it's a load-bearing matter, someone who can calculate loads, bearing capacity, usage, construction is needed.

 

[BirgitS]

. But will the rest of the loft have full load-bearing capacity in that case? Who knows such things?

A structural engineer

 

[Installation]

Aha, that explains it 😀 but unfortunately, I'm not technically skilled enough in construction to be able to answer. It feels like if it's a load-bearing issue, someone needs to calculate loads, bearing capacity, usage, construction.

The column supports the beam when the ceiling joists are being offset. It can be moved to the left in the picture, but it probably stands on a joist or possibly a support if it's between two joists. No idea how it's attached at the other end either.
Then, if you're going to angle the staircase, the beam supported by the columns is so low that I find it hard to see how you'll clear the headroom in the staircase.

 

[justd3t]

The column supports the beam at the conversion of the tie beams. It can be moved to the left in the image but is probably resting on a beam or possibly a support if it's between two beams. No idea how it is fixed at the other end either. Then, if you are going to angle the stairs, the beam supported by the columns is so low that I find it hard to see that you would clear the headroom in the stairwell.

The plan is to shorten the beam by about a meter and support the two tie beams in the same way as historically done. It should work, I'm mostly worried that the rest of the loft won't get the necessary support in the construction. Could there be a construction resembling a tuning fork to allow the stairs to pass through?

 

[4774]

A structural engineer

Exactly 😃. Had a brain freeze when I wrote it before.
In any case, the project seems difficult to manage unless ts is a structural engineer himself 👍

 

[Installation]

The idea is to cut the beam by about a meter and have the two joists supported in the same way as they were historically. It should work; I'm mostly worried that the rest of the loft won't get the support it needs in the construction. Could there be a construction that looks like a tuning fork to allow the stairs to pass through?

It also supports the outer corner of the loft.
An engineer could probably find a solution that works. But it will be expensive to arrange.