Stair terminology — inclined member supporting treads and risers In stair construction, what is the name of the inclined structural member at the ends of the treads and risers that supports them along the slope of the stair?

Introduction / Context:
Stairs consist of several parts with specific roles and names. Correct terminology helps in detailing, fabrication, and site communication. The inclined edge members are especially important because they carry the stair loads and define its geometry.

Given Data / Assumptions:

• Conventional stair with treads and risers.
• Inclined edge/support member present.
• Focus on structural supporting function.

Concept / Approach:

The inclined member that supports the treads and risers is called the string or stringer. A baluster is a vertical post supporting the handrail; a beam is a generic horizontal structural element; “header” is not a standard stair term for the stringer in building practice.

Step-by-Step Solution:

Verification / Alternative check:

Fabrication drawings and site terminology consistently use “stringer” for steel/wood stair side members; concrete stairs have similar sloping edges within the slab.

Why Other Options Are Wrong:

• Baluster relates to the handrail, not structural tread support.
• “Header” is not the correct stair component here.
• “Beam” is too general and typically horizontal.

Common Pitfalls:

• Confusing stringer with “nosing” (front edge of tread).
• Ignoring load paths from stringer to landings and supports.

Final Answer:

String (stringer).