Folded-Plate Stair
Stair type with Z-shaped connected treads and risers.
The folded-plate stair originally arose from folded sheet-metal constructions. Treads and risers are connected Z-shaped from the same material, creating the appearance of a folded plate. Today the term is also used for modern stairs in concrete or engineered timber. Solid timber requires special constructive measures due to natural shrinkage. Because of the complex statics, folded-plate stairs generally require a European Technical Assessment (ETA) or individual approval.