What Is Staircase?
How to Calculate Number of Riser and Tread for a Staircase Steps?
Requirement of Staircase Calculation
• Hight of Staircase.
• Length of Staircase.
• Maximum height of riser should be 150 mm (150 mm to 200 mm)
• Minimum tread length should be 300 mm (250 mm to 300 mm)
• Length of the step should be a minimum of 1000 mm
• Handrail height should be a minimum of 1000 mm.
• Width of the landing slab will be at least 1000 mm for the walkover on the staircase.
Also, read: Type of Stair | Stairs Parts Names & Details
Staircase Design Calculation Example
Now we are going to calculate the required number of Riser and Tread for a Dog legged staircase having
• 1 Meter Width of Landing Slab
• 3 Meter Height
• 4 Meter Width
• Middle Slab Highet 1.5 m
Staircase Dimension Calculation Formula
• Number of Tread = Length of Stair/One number of Tread
• Number of Riser = Height of Staircase/ Height of one number of Riser
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
Number of Riser = 1500/150
Number of Riser = 10 Nos
So as per standard, we are providing 300 mm as tread length.
Number of Tread = Length of Stair/One number of Tread
Number of Tread = 3000/300
Number of Tread = 10 Nos
Hence the required number of Riser and Tread is 10 Nos.
Total No Staircase of = Below landing + Above landing
Total No Staircase of = 10 Nos + 10 Nos = 20 Nos of Stire required to achieve 3 m hight
Concrete Calculation of Staircase
Landing area concrete = L x B x H
Landing area concrete = 1.0 m. x 2.0 M. x 0.150 M.
Landing area concrete = 0.3 Cu.m.——–(1)
Waist Slab Laenght = (a2+b2)= c2
C = Lenght of Waist slab
A = Hight of Landing Slab
B = Breadth of Wasit slab
Waist Slab Laenght = (1.52+3.02)= c2
Waist Slab Laenght = c =√(11.25)
Waist Slab Laenght = c =3.35 m
Wasit slab area concrete = L x B x H x N
Wasit slab area concrete = 3.35 m. x 1.5 m. x 0.150 m. x 2 Nos.
Wasit slab area concrete = 1.501 Cu.m. ——–(2)
Steps area concrete = L x Volume of triangular area x N x Q
Steps area concrete = 1.0 m. x ( 0.300 m. x 0.150 m x (1/2)) x 2 Nos. X 10 Qty
Steps area concrete = 0. 45 Cu.m. ——–(3)
Total Concrete of Staircase = (1) + (2) + (3)
Total Concrete of Staircase = 0.30 Cu.m. + 1.501 Cu.m. + 0. 45 Cu.m.