double-lock seam

double-lock seam

double-lock seam
A type of seam between the edges of adjacent metal sheets; formed by making a double fold, then dressing down to form a seam.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Insist on double-lock seams. The logic that single-lock seams are easier to repair and replace doesn't make sense: The roof is there to stay.