Run

Definition

Run refers to the horizontal dimension in a stair, or the length of the horizontal projection of a piece such as a rafter when in position.

Purpose

The purpose of the run is to define the horizontal distance covered by a step in a staircase or by a structural element like a rafter, ensuring proper design and functionality.

Examples of Use

• In stair construction, the run determines the depth of each step, affecting the comfort and safety of the staircase.
• The run of a rafter helps define the slope and structural dimensions of a roof.
• Carpentry projects often calculate the run to ensure accurate cuts and proper assembly of components.

Related Terms

• Rise: The vertical dimension of a step or the vertical distance between two levels.
• Tread: The horizontal part of a step on which a person stands.
• Slope: The incline or gradient, often expressed as a ratio of rise to run.

Notes

Accurate measurement of the run is essential in construction to ensure the safety and stability of stairs and structural elements, affecting both form and function.