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

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

Stairs: Related Terms

Stairs: Related Terms

Stairs: Planning Width shall be sufficient to provide comfortable passage (domestic: 0.9-1.2 m, public: 1.2-1.8m) Pitch between 25o to 45o Riser shall be convenient for people of all ages (Public: normally 150 mm, Domestic: 150-180 mm) Tread for public is 300 mm for domestic 250-300 mm A flight shall have maximum 12 risers Landing width shall not be less than stair width Must have ample head room

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

Stair Types: Straight Stair

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

Stair Types: Quarter Turn Stair

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

Stair Types: Half Turn Stair

Stair Types: Half Turn Stair

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)

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

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

Stair Types: Circular/Spiral Stair

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