ᐅ Reopen the floor slab to install a new staircase. Should the ceiling be temporarily supported in the middle?

Hello everyone.
I have a question regarding the installation of a staircase that was blocked off by the previous owners of our house using OSB boards and drywall panels. We are now converting the attic and want to have a new staircase installed. According to the previous owner, they didn’t install any additional supports or beams. The wall where the last tread meets is not load-bearing.

Hello,

Unfortunately, it is impossible to answer without floor plans, sections, or pictures.
The fundamental question is whether the attic can be converted at all in terms of load-bearing capacity, since a significantly higher weight in kg/m² must be considered.

If necessary, a structural engineer needs to verify first whether the existing wooden rafters are sufficient for this.

Actually, the attic was previously renovated. In 1995, an extension was added, and the roof was closed off in a stepped design. The staircase to the upper floor was then located in the extension. I could send a floor plan in the evening when I’m home. Maybe that would be helpful?

May I briefly summarize?

You have a house with an attic. The attic was previously converted and is now going to be renovated again. There used to be a staircase to the attic, which is to be rebuilt.

What exactly is your question now? What was possible before is still possible today.

Yes, that's pretty much the case. The previous owners started covering everything completely with OSB boards, but that’s where it ended. Now we want to turn the upper floor into a bathroom and a large children's room. We also plan to create an opening in the ceiling to install a staircase. My doubts can no longer be cleared up or answered by the previous owners, specifically whether I need to install a support beam for the beam directly next to the opening. All I was told is that they closed the old hole from below with drywall panels and covered the floor above with OSB boards.

Rudi142 schrieb:

And again, I need to make an opening in the ceiling to install a staircase. My doubts can no longer be resolved or answered by the previous owners as to whether I need to support the beam directly next to the opening.

I still don’t understand the question. There was an opening in the ceiling for the old stair access. If there was a staircase there before, shouldn’t it be possible now as well?

Only drawings and photos, along with information about what kind of new staircase is planned, will really help. Without that, your post is completely unclear.