Staircase Design MCQ with answer and solution

Concept

Minimum staircase width in residential buildings

Formula

NONE

Step-by-step solution

1. NBC 2005 specifies minimum staircase width requirements based on occupancy type and safety egress needs. 2. For residential buildings, smaller occupant loads allow narrower stairs compared to public spaces. 3. Therefore, the minimum width of a staircase in residential buildings is 1.0 m. Answer: A

Explanation

NBC 2005 guidelines for residential construction require staircases to be wide enough for safe everyday passage and emergency evacuation. The code specifies a minimum clear width of 1.0 m for staircases in residential buildings. Consequently, 1.0 m is the correct standard.

Why the other options are wrong

B) 1.2 m is the minimum staircase width required for educational buildings. C) 1.5 m is required for public buildings, which is wider than necessary for residential buildings. D) 1.8 m is the minimum width required for institutional or hospital buildings.

Shortcut

Minimum staircase width for residential buildings is 1.0 m.

Common mistake

Confusing residential staircase minimum width (1.0 m) with public building staircase width requirements (1.5 m).