What is the acceptable range for the combined measurement of tread and rise in stair design?

Building Materials and Construction MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Building Materials and Constructioncivil-engineering-mcqs › building-materials-and-construction
Published
11 Jan 2019
Last updated
28 May 2026

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Explanation

The sum of the tread and rise in stairs should ideally fall between 400 mm and 450 mm to ensure comfortable and safe stair usage. Values outside this range may result in stairs that are difficult or unsafe to use.

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