mortar fillet

cement fillet, weather fillet

Mortar which provides a weathertight seal in a corner between roofing slates and a wall; used in place of flashing.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Some 30 years ago, the joints between the timber frame and the brickwork were again mortar fillets but since then they have been replaced in a sealant.