A stair tread consists of a tread and a riser. The term riser refers to the vertical side of a step. On our spiral staircases, there is an empty space between the individual steps as standard. However, a metal riser can be fitted as an option on the wooden steps. This is particularly useful if small children use the stairs, which is why the riser is also known as child safety rail.
The rise of a staircase indicates how steeply it rises. It specifically describes the height from one tread to the next and is usually given in millimetres or centimetres.
A staircase with a low rise is more comfortable to climb, but it also takes up more space. The opposite is true for a steep rise. The choice of rise is therefore an individual decision that should be made according to one’s own preferences and the available space. You can adjust the rise of the Minka system stairs yourself within certain limits.
A right-turning spiral staircase is climbed from the bottom to the top at a clockwise direction. When you climb the stairs, the centre spindle is on your right and you can hold on to the banister with your left hand.
All Minka spiral staircases can be installed in both left- and right-turning positions.
The term railing bar or railing rod refers to all vertical bars of stair railings. Horizontal rods on some staircases, on the other hand, are referred to as bottom chords, lower girders or bottom rails.
The railing or banister is one of the most important components of system staircases, as it enables safe ascent and descent. There are three different types of banisters for Minka’s spiral and space-saving staircases: The bar railing consists only of vertical bars and a handrail. The lower girder railing has horizontal bars – so-called lower girders – in addition to the vertical bars. The step railing, on the other hand, consists of L-shaped metal rods that are attached to each other.
The rotation per step is about the angle at which the steps wind around the centre pillar of a spiral staircase. If the rotation per step is high, it means that the steps are comfortable to walk on. On the other hand, if the angle of rotation is smaller, less space is required for the stairs.