1. Malaviya National Institute of Technology Jaipur, Jaipur, INDIA
Stairs
Dr. Sumit Khandelwal,
Malaviya National Institute of Technology Jaipur, Jaipur, INDIA

2. Stairs For access between different floors
Must be centrally located. If not, approach must be clearly marked/known
More than one stair in big buildings
Riser/tread to be decided according to NBC provisions
Must be fire-resistant
Variety of designs
Choice of construction materials

3. Stairs: Related Terms

4. Stairs: Related Terms

5. Stairs: Planning
Width shall be sufficient to provide comfortable passage (domestic: m, public: m)
Pitch between 25o to 45o
Riser shall be convenient for people of all ages (Public: normally 150 mm, Domestic: mm)
Tread for public is 300 mm for domestic mm
A flight shall have maximum 12 risers
Landing width shall not be less than stair width
Must have ample head room

6. Stair Types: Straight Stair
Stair may have one flight or two flights with a landing
Normally open type stair with one side open
Space constraints
Only for small buildings/ domestic buildings
Any material

7. Stair Types: Straight Stair

8. Stair Types: Quarter Turn Stair
Two flights
Change in direction, turns left/right
Direction change facilitated by landing
Winders may also be there instead of landing, when space problem

9. Stair Types: Quarter Turn Stair

10. Stair Types: Half Turn Stair
Two or more flights
Direction reversed at next floor
Direction change facilitated by landing
Landing width may be equal to width of stair well
Steps/winders may also be used instead of landing
More or less equal risers in two main flights
Most common type of stair
Dog-legged or open newel stair

11. Stair Types: Half Turn Stair

12. Stair Types: Half Turn Stair

13. Stair Types: Three Quarter Turn Stair
Direction changes by 270o
Normally used when height is more and limited length
Some flights have very few risers (only 3-4)

14. Stair Types: Bifurcated Stair
One flight bifurcates into two flights
Width of starting flights more than bifurcated flights
Normally for public buildings

15. Stair Types: Circular/Spiral Stair
Geometrical stairs
Only winders as steps
Continuous change in direction
Normally not the main staircase
Used to access areas having limited entry
Steel is them most common material

16. Stair Types: Circular/Spiral Stair

17. Stair Types: Helical Stair
Geometrical stairs
Only winders as steps
Continuous change in direction
Normally not the main staircase
Used to access areas having limited entry
Steel is them most common material