Glossary
TYPE OF STAIRS Open riser staircase: stair characterized by a series of straight winder or platform, which allow the staircase to change direction with a 90° turn. The support is composed of a structure under the steps. Space saving staircase: open staircase characterized by small steps, specially shaped to allow a steep incline of the staircase. The support is composed of a structure under the steps. Spiral Staircase: staircase characterized by steps and by a final landing, fixed to a central column. Configuration: shape of the finished staircase. Open staircases can have linear configuration, with one turn or with two turns. Spiral staircases have two types of configurations: round or square. MAIN COMPONENTS OF THE STAIRCASE Structure: modular elements in steel joined together to support the steps. Steps: wooden elements and the structure are the building blocks of the staircase; the railing is fixed to the steps. In the open staircases, the steps are linear, triangular or square in case the direction of the stairs changes by 90°. In the space-saving staircases they are staggered and shaped in order to reduce the landing space of the stair. In the spiral staircases they are arranged circularly around the central column. Landing: in space saving staircases and in some models of open staircases is used to change direction (in correspondence of the turn). In the spiral staircases this corresponds to the last step positioned at the landing of the stair, it can be adapted during installation at any ceiling slab opening (triangular, trapezoidal or circular). Railing: inclined parapet positioned to the side of the steps to prevent any possible fall while ascending or descending the staircase. Balustrade: horizontal parapet positioned on the upper floor to prevent possible fall on the lower level.
MAIN DIMENSIONS OF THE STAIRCASE Width (open rise and space saving staircase): overall width of the stair, i.e. the width of the step including the railing. Diameter (spiral staircase): diameter of the stair including the railing. Rise: vertical distance between the surface of two successive steps. This distance is adjustable depending on the default values that vary from stair to stair and that have been established on the basis of the common stair code. By changing the value of the rise, the total height of the stairs varies: the higher the number of steps, the smaller the value of the rise. In the open and space-saving stairs the number of rises as equal to the number of steps plus one, the last step to the upper floor landing is installed a step below the slab (the distance between this step and the flooring of the upper floor is equal to the rise). In the spiral staircases the number of rises is equal to the number of steps: the top landing is installed at the same level as the flooring of the upper floor. Run: depth of the step from the front edge of the step up to the projection of the front edge of the next step. In the open stairs the tread is adjustable according to the default values on the basis of the model. The adjustment occurs by moving the step backward or forward in the installation phase. STAIRCASE AREA Stairwell: vertical and horizontal space provided and available for the position of the staircase. Ceiling slab opening: opening of the ceiling slab for the installation of the staircase. It can be square, rectangular, L shape, circular, or may be a direct landing to the ceiling slab. Height between the floors: vertical distance that goes from the finished flooring of the lower level to the finished flooring of the upper level.
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