noun

joist

/ˈdʒɔɪst/ · say it: JOYST

one of the parallel beams supporting a floor or ceiling

In Architecture & Design

In more detail

1. (noun) a beam that supports the floor or ceiling of a building

Examples

The carpenter nailed the floorboards to the wooden joists beneath them.

How to use joist

A joist is a specific structural element in building construction, typically a horizontal beam made of wood or steel that runs parallel to others to support floors or ceilings. It is used in technical and construction contexts and is more specific than the general term 'beam', which can refer to various structural members.

Common phrases

floor joist
ceiling joist
wooden joist
steel joist
joist span
joist spacing

Synonyms

beam · rafter · timber · support · girder

Word family

joisted

A common mistake

Learners sometimes confuse 'joist' with 'joint' (a connection between two parts), or fail to distinguish it from other structural elements like joists versus beams versus rafters based on their specific functions and orientations.

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