Planning glossary

Joist

A repeated horizontal framing member supporting a floor, ceiling, or roof under a defined structural design.

Example

A room dimension does not determine joist size without span, load, spacing, material, support, and condition data.

Related concepts

Use the term in context

Definition boundaryThis planning definition is not a substitute for the definition in an adopted code, standard, contract, manufacturer instruction, or professional document. Confirm the controlling meaning for the project.