Continuous stairs are those which do neither have any landing nor any intermediate newel post. They are , therefore , geometrical in shape. Continuous stairs may be of the following types:
Circular stairs,
Spiral stairs, and
Helical stairs.
Circular stairs are shown in figure 5 b and 8 b. Spiral stairs is shownin figure 10 a. Such a stair is usually made either of R.C.C. or metal, and is employed at a location where there are space limitations. These are also used as emergency stairs, and are provided at the back side of a building. All the steps are winders. The stair is , therefore , not comfortable.
A helical stair, shown in figure 10 b. below, looks very fine but its structural design and construction is very complicated. It is made of R.C.C. in which a large portion of steel is required to resist bending, shear and torsion.
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