trimming joist
1. A joist supporting one end of a header at the edge of an opening in a floor or roof frame, parallel to the other common joists. See also: Joist
2. A joist supporting one end of a header at the edge of an opening in a floor or roof frame, parallel to the other common joists.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
trimming joist
A joist, supporting a trimmer, of larger cross section but of the same length as, and parallel to, the common joists.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.