Another little confusing task in construction is calculating the number of steps for a staircase.
Apart from the Septic tank and water tank size calculation one of the mind-blowing thing in building construction is staircase design.
It is simple & easy when you understand the method of calculation and now we are going to discuss the staircase step design calculation.
Minimum Specification
- The maximum height of riser should be 150 to 200 mm.
- The minimum tread length should be 250 to 300 mm.
- Length of the step should be a minimum of 600 mm.
- The handrail height should be a minimum of 1 metre.
- The width of the landing slab will be at least 1000 mm for the walkover on the staircase.
Staircase Design calculation – Example
Now we are going to calculate the required number of Riser and Tread for a Dog legged staircase having
- 3-metre height
- 4-metre width
- 1-metre width of landing slab
Staircase Dimension Calculation Formula
Number of Riser = Height of Staircase/ Height of one number of Riser
Number of Tread = Length of Stair/One number of Tread
From the above Diagram,
The staircase has divided into two flights providing a landing slab at mid of the staircase height.
So Number of Riser = Height of Staircase / Height of one Rise
= 1500/150
= 10 Nos
So as per standard, we are providing 300 mm as tread length.
Number of Tread = Length of Stair/One number of Tread
= 3000/300
= 10 Nos
Hence the required number of Riser and Tread is 10 Nos.
IMPORTANT NOTES
The tread and rise size will be change as per the usage.
You may see the height of the riser will be provided as 100 mm or 120 mm in the railway station and hospital building staircase.
Since senior citizens and sick people are using the staircase at the locality, the riser and tread size may be decreased for their convenience.
Staircase Calculator
You may calculate the length and height of the tread or rise of the staircase by using the following calculator.
6 Comments
Easily under stand
Nice information about the staircase and it’s calculations.
Excellent
There is very useful information on finding stair steps and risers. and the explanation is also very simple.
How to calculate the number of rise and tread when you have going of flight
I like the way informations are provided here for public viewing and befenit.