15 Different Parts of stairs for (House or Buildings) - Civil Click

15 Different Parts of stair cases

Parts of Stairs

Staircases in the houses increase the aesthetic appearances by from making it more functional. The stair provides quick and easy access to one floor to another floor of the house. You must know the basic parts of stairs before constructing it.

In the stairs, different parts of the stairs are used having a different function. The all-important technical terms used in the connection of the stairs are,

1: Baluster:

The baluster is a vertical member of metal or wood and supporting a handrail.

  • It is also called spindle.
  • It is mainly made up of plastic, steel, wood and some times with stones.
  • The baluster is supporting the handrail or the caping of a  parapet of the staircase.

2: Handrail:

The inclined rail over the string is termed as a handrail.

  • It provides stability and support.
  • It is mainly used in descending and ascending staircases.
  • According to the OSHA, the minimum height of handrail must be 30″(76 cm) and not more than 37″(94 cm).
  • Handrails are mainly supported with the help of posts or walls.

3: Soffit:

The soffit is the underside of the stair or bottom of the stair slab.

  • Under the surface of the stair called soffit.
  •  Some times it is invisible due to the under-stair construction of store or Bath.
  • It is either finished with plaster or may be covered with the ceiling.

4: Waist:

The waist is the thickness of the structural slab of RCC stair.

  • In this waist the steps rest.
  • It is made up of RCC or wood
  • The waist is the minimum thickness perpendicular to the soffit of the staircase
  • The steps on the waist are may be made up of brick, wood or concrete.

5: Nosing:

Nosing is the part of the tread beyond the face of the riser and it is usually to give good architectural shape.

  • It is projected to increase trade foot space.
  • It end is usually in the rounded shape.
  • The nosing length is not more than 1.5″.

6: Riser:

The riser is the vertical distance between the two tread faces. According to Nptel,

  • In public buildings, we mainly use the rise 150mm.
  • In residential buildings, we use 190 mm mainly.

7: Tread:

Tread is the upper horizontal portion of a step which the feet is placed. The trade is the most important parts of stairs.

  • The top portion of the step called tread.
  • The trade length is mainly used 270 mm in residential buildings.
  • 300 mm tread length is used for the public buildings.

8: Step:

The 1 trade and 1 rise make a complect 1 step.

  • The step area depends on the rise and tread we want to provide.
  • It is may be made up of brick, concrete or wood.

9: Flight:

Flight is a series of steps without any break or landing.

  • It is made up of many steps.
  • In one flight 8 to 10 or may in some places 12 to 15 steps, we constructed (According to Quora community).
  • It is made up of wood or RCC.

10: Landing:

Landing is the platform at the top or bottom of a flight between the floors.

  • Landing is pressent in the two excessive flights.
  • It is also known as resting position in the stairs.
  • We also provide to change the direction of the flights.

11: Run:

It is the total length of stairs in the horizontal plane.

  • The length of landing length is included in the run.
  • It is also calculated by adding the trade lengths and landing length (if provided).
  • It is a horizontal distance of the stair.

12: Going:

The horizontal distance between the first and last riser.

  • It is the width of the tread between two successive risers.
  • It is measured from stair nosing to nosing.

13: Pitch line:

The line connecting the nosing of all treads in a flight of stairs.

  • It is an imaginary line along the nosing tip of the treads.
  • The pitch slop is measured with angles (tangent)
  • The horizontal line angle is measured in degrees.

14: Pitch:

The angle between the pitch line and horizontal called pitch.

  • Pitch also called rake.
  • Its angle is measured with the degree.

15: Blocking:

Blocking supports the underside of the steps.

  • It is mainly provided in wood steps.
  • It provides additional support to the step.

These parts of stairs may pronounce differently in different languages.


The Headroom is not less than 2 meters vertically above the pitch line.

Read Also:

  1. Cutting length of the rectangular stirrup.

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