According to the NCC, the stair design formula 2R + G is used to assess the comfort and safety of stairs. In this formula, what does R stand for?

Question

BlackTom AI · Accepted Answer

In this question, we’re evaluating the terminology used in the NCC stair design formula 2R + G, where each symbol corresponds to a stair element.
Option 1: 'Rise' — This term often refers to the vertical rise of a single step, but in the NCC context the variable representing the vertical dimension is typically called 'Riser'. Conflating 'Rise' with the formula’s parameter would be a mislabeling of the component involved.
Option 2: 'Risers' — This plural form would imply multiple vertical elements or steps. The formula uses a singular variable, so using 'Risers' would not align with the standard notation of the 2R + G expression for one riser per stair unit.
Option 3: 'Riser' — This is the standard term used to denote the vertical component of a single step, i.e., the upright face that forms the height between two treads. In the 2R + G formula, 'R' corresponds to this single riser dimension, matching the conventional terminology for stair geometry.
Taken together, the options contrast singular vs. plural forms and the common stair terms, and only the singular 'Riser' correctly maps to the variable 'R' in the NCC formula.

ABPL30041_2025_SM2 Quiz 1 - Late Tutorial

According to the NCC, the stair design formula 2R + G is used to assess the comfort and safety of stairs. In this formula, what does R stand for?

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