Which of the following is/are incorrect about a staircase?

🔬 Understanding the Question

This question requires a precise understanding of staircase terminology. We need to carefully evaluate each statement to identify which ones provide an incorrect definition for the given component.

⚖️ Detailed Analysis of the Statements

Let's break down each statement based on standard civil engineering definitions.

(i) String is the part of tread which is projecting beyond the face of the riser

Analysis: INCORRECT. The part of the tread that projects beyond the riser is called the Nosing. A String (or Stringer) is the inclined structural member that supports the ends of the steps.

(ii) Soffit is a sort of additional moulding provided under the nosing or tread to beautify the step in elevation

Analysis: INCORRECT. The moulding provided under the nosing is called a Scotia. The Soffit is the entire underside surface of the staircase flight.

(iii) Baluster is a member supporting the handrail

Analysis: CORRECT. Balusters are the vertical posts or spindles that are installed between the newel posts to support the handrail.

(iv) Newel post is a vertical member at the ends of flights

Analysis: CORRECT. A newel post is a larger, structural post placed at the beginning, end, and turns of a staircase to anchor the handrail and stringers.

📚 Comprehensive Glossary of Staircase Components

To clarify, here is a visual guide and a glossary of key staircase terms.

• Strings (Stringers): The sloping members that support the ends of the steps.
• Nosing: The projecting edge of the tread over the riser.
• Soffit: The underside of the staircase.
• Scotia: A concave molding under the nosing for support and decoration.
• Baluster: The smaller vertical members that support the handrail between newel posts.
• Newel Post: The large vertical post at the ends of flights that anchors the handrail.
• Tread: The upper horizontal part of a step where the foot is placed.
• Riser: The vertical part of a step.