plain lap

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lap joint

lap joint, 2
1. A joint in which one board, plank, metal plate, etc., overlaps the edge of another piece; the overlapping part of each member is cut away to half thickness, resulting in flush surfaces.
2. A joint formed by placing one piece partly over another and uniting the overlapped portions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.