Understanding Staircase Dimensions for Perfect Design

Staircase planning is essential in any construction project. Accurate calculations ensure both functionality and safety. Here, we’ll break down how to find the length and width of a staircase using the simple given data.

Given Data for the Staircase

To determine dimensions, the following data is provided:

• Floor Height: 10 feet

• Riser Height: 6 inches

• Tread Size: 11 inches

This forms the base of our calculations.

Calculate the Number of Risers

A riser is the vertical part of a step.

Conversion:
1 foot = 12 inches
10 feet = 120 inches
Riser = 6 inches

Formula:
Number of Risers = Total Height ÷ Riser Height
= 120 ÷ 6
= 20 risers

Determine the Number of Treads

A tread is the horizontal surface of a step where you place your foot.

Formula:
Number of Treads = Number of Risers – 1
= 20 – 1
= 19 treads

Calculate the Length of a Staircase Without Landing

Each tread is 11 inches or 0.9166 feet. Multiply by the number of treads.

Formula:
Length = Number of Treads × Tread Size in Feet
= 19 × 0.9166
= 17.415 feet

Add Landing to Find Total Staircase Length

A landing adds to the total horizontal space.

Landing Length: 4 feet

Formula:
Total Length = Stair Length + Landing
= 17.415 + 4
= 21.415 feet

Find the Width of the Staircase

Assume the staircase has two flights with a central landing and side clearance.

Formula:
= 3.5′ + 3.5′ + 0.65′
= 7.65 feet

Final Staircase Dimensions Summary

• Height of Floor: 10 ft

• Number of Risers: 20

• Number of Treads: 19

• Tread Size: 11 inches

• Stair Length (excluding landing): 17.415 ft

• Landing Length: 4 ft

• Total Staircase Length: 21.415 ft

• Total Staircase Width: 7.65 ft

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