chimney apron

chimney apron

[′chim·nē ‚ā·prən]
(building construction)
A flashing made of a nonferrous metal, such as copper, that is built into the masonry of the chimney and the roofing material at the place where the roof is penetrated by the chimney.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

chimney apron

A nonferrous metal flashing built into the chimney masonry and roofing at the penetration of the roof by the chimney.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.