I usually place the spiral staircases next to a wall. this wall partially replaces the handrail.
I love open constructions and therefore staircases without railing or handrail. but in real I would of course also install a bit more security, but not 50cm stone walls, but 25mm wood walls.
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Pascal
SH3D 6.6 / Ubuntu 22.04 (Mainline-Kernel) / Radeon RX580 / Ryzen 7 5800x
