3 November 2026
A staircase cast, not assembled
This staircase has no stringer and no central post: the flight holds by its shape. Everything is decided in the formwork. The curve is set out on the floor, built up in bent boards, then reinforced; the concrete is poured in one go, treads and curved wall included. When the forms come off, the helix already exists. A lime render then brings treads, wall and underside into one tone, close to that of the floor. Above, the steel beams and timber deck stay exposed. In the photo, low sunlight is enough to read the curve: no joint, no visible fixing, a piece drawn before it was poured.
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