Folded-Plate Stair — Layout variation
Category: Layout variation
Stair with treads and risers joined in a continuous Z-shape from one material.
The folded-plate stair has its roots in folded sheet-metal constructions: treads and risers are connected from one continuous material into a Z-shape, producing a folded, origami-like appearance. Today the principle is transferred to stairs in concrete, steel and wood-based materials. Structurally there are folded-plate stairs without additional supports, with a single lateral stringer, or with a central beam. In solid wood, timber shrinkage and seasonal movement must be absorbed through suitable joinery so that the joints remain tight in the long term. Because of the complex load path and the structural interdependence of treads and risers, folded-plate stairs usually require a European Technical Assessment (ETA) or a case-specific approval. Aesthetically they are highly minimalist and emphasise the pure geometry of the steps within the room.
Related terms
Related terms: Stringer Staircase (Umbrella Term), Bolt Stair (Structural-Bolt Staircase), Centre-Stringer Stair, Self-Supporting Stair, Construction Protection, Folded-Plate Staircase on a Central Beam.