Winder Tread

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.