For residential buildings window openings area should be minimum
- A5% of floor area
- B10% of floor areaCorrect
- C20% of floor area
- D25% of floor area
Solution
Concept
Minimum window area for residential buildings
Formula
NONE
Step-by-step solution
1. Building bylaws require adequate natural light and ventilation for healthy living conditions. 2. Standard guidelines specify that the total area of window openings should not be less than 10% of the floor area for residential buildings. 3. Therefore, the minimum window opening area required is 10% of floor area. Answer: B
Explanation
Building bylaws for residential structures typically mandate that the total area of window openings should be at least 10% of the room's floor area to ensure sufficient natural light and ventilation. This standard minimum percentage helps maintain healthy indoor air quality and daylighting. Therefore, 10% of the floor area is specified as the minimum required window opening area.
Why the other options are wrong
A) 5% of floor area provides inadequate natural lighting and air ventilation for habitable rooms. C) 20% of floor area is recommended for public, educational, or industrial buildings rather than residential minimums. D) 25% of floor area is typical for hot-humid climates or large commercial spaces, exceeding standard residential requirements.
Shortcut
Residential window openings must be at least 10% (1/10th) of the floor area.
Common mistake
Confusing the 10% minimum rule for dry climates with the 20% requirement for hot and humid climates.
Correct answer: B) 10% of floor area