In a tight 1m² spiral, the stair angle is steep. You must calculate the "critical headroom point" to ensure that as a user walks down the stairs, their head does not hit the edge of the upper floor slab. This often necessitates a larger opening in the upper floor than the staircase footprint itself.
Because normal stair geometry (with comfortable 18 cm rises and 25 cm treads) cannot fit into such a tiny area, a 1m² staircase relies on one of two steep, space-saving configurations: 1m2 stairs dimensions
). These are most common in loft conversions or tiny homes where space is extremely limited. For a staircase to function within a In a tight 1m² spiral, the stair angle is steep
A 1m² staircase means the of the stair assembly covers approximately 1 square meter (roughly 10.8 square feet). This is extremely small; for context, a standard residential staircase often occupies 4–6 m². Because normal stair geometry (with comfortable 18 cm