Winder Tread — Underfoot element
Category: Underfoot element
Wedge-shaped tread in winding stair sections.
Winder treads are wedge-shaped steps in the winding section of a staircase. The inner side (at the stairwell or the newel) is narrower than the outer side (at the wall or open stringer). DIN 18065 stipulates that the going at the walking line must also meet the minimum dimensions on winder treads. The geometry of the winder treads largely determines the walking comfort of a winding staircase.
Winder Point Tread: The winder point tread refers to the narrowest, inner section of a curved step – where the tread converges towards the inner stairwell edge. This winder point lies inside the walking line and is not used during normal walking. However, it must still safely bear the load of the tread and is considered in structural sizing. Modern flaring methods aim to keep the winder point to the necessary structural minimum and thus maximise the going in the walking zone.
Related terms
Related terms: Tread Flaring — Overview for Curved Stairs, Winder Step, Tread Depth (Going), Tread Width — Historical Term, Walking Line, Helical Stair.