Step Proportions

All the risers and treads should be of uniform dimensions. The steps should neither be too wide or too short. Further high rise may cause inconvenience and fatigue to the user.

The following empirical rules may be followed:

1. Rise + Tread : not < 40 and not > 45
2. 2 Rise + Tread : not < 58 and not > 63
3. (Rise) × (Tread) : not < 400 and not > 500

For residential buildings, the common size of step is 15 × 28 cm. Rise greater than 20 cm and tread less than 22 cm should not be used. In general, (2 Rise + Tread) approximately equal to 60 will give a comfortable flight.