trimmer joist

9.9

A beam that supports the end of an opening in floors and roofs, like a stair or chimney

noun

Specialized

: viga de refuerzo

The contractor installed a trimmer joist to support the staircase.

Examples

The carpenter installed a trimmer joist to support the new skylight opening.
They reinforced the floor by doubling the trimmer joist near the chimney.
A staircase often requires a trimmer joist on each side to frame the space.
Many builders prefer using trimmer joists for better structural integrity.
A staircase often requires a trimmer joist on each side to frame the space.
The carpenter installed a trimmer joist to support the new skylight opening.
They reinforced the floor by doubling the trimmer joist near the chimney.

Synonyms

trimmer

vstrimmer joist

Specialized

8.3

A short beam that supports another beam at the edge of a floor opening

has identical meaning but is the longer, more explicit compound form

Surface Forms

trimmer joist singular

trimmer joists plural

Morphology

trimmer + joist

The compound is directly compositional: 'trimmer' names a joist used to support header ends for openings and 'joist' is a structural support, so a B1 learner who knows those constituents can infer it denotes a specific kind of joist used around openings. Although the term is technical construction jargon, it follows a common noun+noun naming pattern found cross-linguistically, making its meaning transparent from the parts.

Etymology

The noun trimmer joist comes from building work: a joist is a long beam and a trimmer is a beam placed beside an opening. A trimmer joist sits next to a hole for a stair or chimney and takes the weight from the end of the beam that crosses the opening, so it 'supports' and 'frames' the 'opening'.