In light-frame construction, a trimmer is a timber or metal beam (joist) used to create an opening around a stairwell, skylight, chimney, and the like. Trimmers are installed parallel to the primary floor or ceiling joists and support headers, which run perpendicular to the primary joists. 
It can also refer to a jack stud that supports a header above a window or door opening.
- "Architectural Graphic Standards Online". Retrieved 2016-07-25.
- Ching, Francis D. K. (2001). Building Construction Illustrated, 3rd Edition. John Wiley & Sons, Inc. pp. 4.21, 4.31. ISBN 0-471-35898-3.
- Glossary, building terms, word definitions. Define Cripple Stud
- Hometime Glossary - Framing
- Building a Wall 3 - Three Stud Corner and Windows | DoItYourself.com
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