split jamb

split frame, split jamb

A doorframe with the jamb split in two or more pieces; may be used to enable a pocket-type sliding door or vertical sliding sash to enter the partition.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Sensible wood use also relates to constructing split jambs out of one composite piece, which uses 20 percent less wood than building them separately.