Helical stairs, also called as curved staircase connect the levels of the house with flowing arc. So it makes and ideal access for retail, showrooms and other public spaces. Also, they look glamorous in an office or residential interior where they give the marvelous focal point out of it. Helical staircases are a statement, often used as a main staircase or exclusive curved staircase. They frequently consists of two rolled stringers and treads attached between them.
A curved staircase does not have a central column setting it apart from spiral stairs.