Basic Important Points to know before Stair Design

Basic Important Points to know before Stair Design

Q1. What is the minimum permissible width of Staircase landing?

Answer: The minimum permissible width of Staircase landing should be equal to the width of the flight.

Q2. Summation of Tread and Riser must lie in between –

Answer: The Summation of Tread and Riser must lie between 400 mm to 450 mm.

Q3. What should be the maximum and minimum pitch in a good stair?

Answer: The maximum pitch in a good stair should be 40 degree and the minimum pitch in a good stair should be 25 degree.

Q4. What is the minimum permissible width of the staircase flight?

Answer: The minimum permissible width of the staircase flight is 900 mm.

Q5. How to calculate the Number of Riser when the number of the tread is known to you?

Answer: The formula for Number of Riser is –

Number of Riser = Tread + 1

Q6. What is the standard size of Tread and Riser for residential buildings?

Answer: The standard size of Tread is 250 mm and Riser is 150 mm for residential buildings.

Q7. The height between two floors is 3 meters (3000 mm) and Riser = 150 mm. Assume two flights in between the two floors. Now find the Number of tread and Riser?

Answer: We know, Number of Riser = Floor to floor distance / Riser height

= 3000 / 150 = 20 Numbers

So Number of Riser is 20

Now, we know, Tread = Riser – 1 for one flight,

Here we have 2 flights.

So, Tread = Riser – 2 = 20 – 2 = 18 Numbers

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