Steel design – naming the beam outside a wall up to the floor level above it In building construction terminology, what is the beam provided along the outside face of a wall, supporting the floor immediately above that wall called?

Introduction / Context:
Correct terminology is essential in structural engineering drawings and site communication. The beam that runs along the outside face of a wall and supports the edge of a floor slab or floor beams above is commonly used in framed buildings and masonry-plus-frame construction. Knowing this term helps avoid confusion with roof members (rafters, purlins) and openings (lintels).

Given Data / Assumptions:

• Member location: outside of a wall, at or just below the floor it supports.
• Function: supports the outer edge of the floor system and transfers loads to columns/walls.
• No numerical calculation is required; this is a definitions/terminology question.

Concept / Approach:
The beam at the perimeter of a building that supports the floor slab or secondary joists alongside an external wall is termed a spandrel beam. It picks up floor loads and façade loads, and often serves as the structural line for cladding supports. Do not confuse it with a lintel, which sits over wall openings, or roof elements like rafters and purlins which belong to roofing systems.

Step-by-Step Solution:

Verification / Alternative check:
Look at architectural-structural coordination: spandrel panels and façade systems often connect to spandrel beams at each floor line, confirming the placement and function implied by the question.

Why Other Options Are Wrong:
Rafter supports roof slopes, not floors. Purlin supports roof sheeting on rafters. Lintel spans over wall openings like doors/windows. Header beam is a generic term and does not specifically denote the outside wall-floor beam in multistorey buildings.

Common Pitfalls:
Assuming any beam near an opening or wall is a lintel; mixing roof and floor terminology; overlooking that “spandrel” also refers to the façade panel region between floor lines.

Final Answer:
Spandrel beam