Roof Parts Terminology

An inclined roof surface is a common feature in many buildings, designed to shed water and provide shelter. Various parts of the roof have specific names that describe their position and function. Understanding these terms is important in building construction and architecture.

Eave: The Lower Edge

The question asks for the name of the lower edge of an inclined roof surface. Let's look at the options provided and define each term in the context of a roof:

• Verge: This refers to the edge of an inclined roof that runs from the ridge down to the eave, typically where the roof slope ends at a gable wall. It's the sloping edge where the roof overhangs the gable end of the building.
• Eave: This is the horizontal lower edge of an inclined roof. The eave is where the roof slope finishes and usually extends beyond the wall of the building, forming an overhang. This overhang helps to direct rainwater away from the walls below.
• Ridge: This is the horizontal line formed at the apex or highest point of an inclined roof, where two sloping roof surfaces meet. It runs along the top of the roof.
• Span: This term typically refers to the horizontal distance between supports, such as the distance between bearing walls supporting a roof truss or beam. While related to roof structure, it does not describe a specific edge of the roof surface itself.

Based on these definitions, the term that specifically describes the lower edge of an inclined roof surface is the Eave.

Summary of Roof Edges

To clarify the different edges of an inclined roof:

• The lower horizontal edge is the Eave.
• The sloping edge along a gable wall is the Verge.
• The highest horizontal line where slopes meet is the Ridge.

Therefore, the correct term for the lower edge of the inclined roof surface is the Eave.