concave joint

concave joint

A recessed masonry joint formed in mortar by the use of a curved steel jointing tool; because of its curved shape, it is very effective in resisting moisture. See also: Mortar joint
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

concave joint

concave joint
A recessed masonry joint, formed in mortar by the use of a curved steel jointing tool; because of its curved shape it is very effective in resisting rain penetration; used in areas subjected to heavy rains and high winds.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Whatever is handy and has about the right radius to create a slightly concave joint will work.
Flat or concave joint surfaces are the best for horizontal paving.