Hi,
I'm building a house and need a staircase according to the image below. Supplier not yet chosen. Right now I'm working on the walls and trying to figure out what is required for the walls to be able to support the load from the staircase. I haven't gotten a good answer from the supplier I talked to earlier, so I thought I'd try here.
As I understand it, the load should mainly be supported by the floor and the stringer in the outer curve. Both walls in the outer curve are exterior walls that I've spaced with 28x70 and plan to put 11 mm OSB and plasterboard on. However, I'm doubtful if it will be suitable to attach the staircase to that.
I think there must be many here who have built walls and installed staircases who can offer tips?
Thanks in advance!
The question has no definitive answer. It mainly depends on how the staircase is constructed. With three pillars, one in the corner and one on each side where the staircase ends, the walls do not need to bear any loads at all. If you consider attaching the stringers to the walls, there is no advantage in having OSB and 28x70 mm before reaching the wall. The material of the exterior walls also matters in that case.
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