1. Terminology

Balancing

Arrangement of steps at an angle (turning quarter) or change of direction at 90° or 180° (complete swinging of the flight), for more comfortable stair climbing and to reduce the space required in the stairwell.

Several layouts are available. The swing zone in a corner or turning quarter can include :

• radiating steps (uncomfortable and unsightly layout);

• or dance marches.

Cage

The volume of space in which the staircase fits (figure 1 ).