National Occupational Competency Testing Institute (NOCTI) Carpentry Practice Exam

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Which component acts as the main support structure for stairs?

Joist
Stringer
Riser
Tread

The correct answer is: Stringer

The stringer is the primary component that serves as the main support structure for stairs. It is the sloping board that supports the treads and risers, running along the sides of the staircase or underneath the treads. Stringers are crucial for providing the necessary strength and stability to the staircase, ensuring that it can bear the weight of individuals using it. In contrast, joists are typically horizontal support members used in floor and ceiling construction rather than stair construction. Risers are the vertical components that create the height of each step, while treads are the horizontal surfaces that you step on. While risers and treads contribute to the overall stair assembly, they do not provide the structural support that the stringers offer. Hence, the stringer's role is vital in maintaining the integrity and safety of the stair system.