The recommended imposed load on staircase in residential buildings as per IS 875 is:

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ESE Civil 2019 Official Paper

Answer 1

As per IS 875 Part 2, clause 3.1, Imposed Floor load for residential building are:

S.No	Residential Buildings (Dwelling houses)	U.D.L (kN/m²)
1.	All rooms and kitchens	2.0
2.	Toilet and Bath rooms	2.0
3.	Corridors, passages, staircases including tire escapes and store rooms	3.0
4.	Balconies	3.0