Another option for stringer stairs is the twin stringer. The mono stringer is replaced by two thin stringers mounted underneath. The stringers are usually 6” apart and placed in the center of the staircase, although they can sometimes be off center to achieve a more dramatic look. The metal step plates are fastened to the stringers with a board is glued on top for a walking surface. The surface boards are typically hardwood but other materials such as stone, concrete or tile can also be used.

Advantages of Twin Stringer Staircases:

·    Can be made to appear floating.

·    Stringers are more hidden behind the large box steps.

Disadvantages of Twin Stringer Staircases:

·    Long flights of twin stringer stairs can twist too much.