Riser

Definition

A riser is a single vertical increment of a stair, the vertical face between two treads in a stair, or a vertical run of plumbing, wiring, or ductwork.

Purpose

The purpose of a riser in stairs is to provide the vertical component between steps, contributing to the overall height and functionality of the staircase. In plumbing, wiring, or ductwork, risers allow vertical routing of services through a building.

Examples of Use

• In a staircase, each riser contributes to the total rise, determining the step height.
• Plumbing risers carry water supply or drainage vertically through a building.
• Electrical risers route wiring between floors in high-rise buildings.

Related Terms

• Tread: The horizontal part of a step on which a person stands.
• Staircase: A series of steps for passing from one level to another.
• Vertical Run: The upward path of utilities or services in a building.

Notes

The height of risers must be consistent and comply with building codes to ensure safety and comfort in staircases, while utility risers must be designed to support the specific needs of plumbing, electrical, or HVAC systems.