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The minimum head room over a stair must be?

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The minimum head room over a stair must be?

(a) 100 cm

(b) 300 cm

(c) 160 cm

(d) 203 cm

The question was asked during an interview.

Asked question is from House Design and General Arrangement in section Village Housing of Civil Engineering Drawing

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Correct choice is (d) 203 cm

The explanation is: The minimum headroom in all parts of the stairway shall not be less than 6 feet 8 inches (2032 mm) measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the landing or platform on that portion of the stairway.

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