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Question
In staircase design for a residential building, the rise may vary between:
A.
300 mm to 500 mm
B.
150 mm to 180 mm
C.
500 mm to 550 mm
D.
600 mm to 650 mm
Answer ( Option B)

150 mm to 180 mm

Solution

General requirement of a stair
  Min rise (mm) Max rise (mm) Min going (mm) Max going (mm)
Private stair 150 220 220 300
Utility stair 150 190 250 400
General access stair 150 170 250 400
 
∴ Rise vary between 150 mm 180mm is the appropriate answer.
 
Note: 
The normal relationship between the rise and the going is that '2 × the rise + the going' should be between '550 and 700 mm'.

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