Question

In residential buildings, the rise may vary between:
1. 150 to 180 mm
2. 200 to 250 mm
3. 50 to 75 mm
4. 100 to 120 mm
5. 275 to 300 mm

Answer 1

Correct Answer - Option 1 : 150 to 180 mm

Explanation

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, 

 The normal relationship between the rise and the going is that 2 x the rise + the going should be between 550 and 700 mm.