EXHIBIT 21

SUBSIDIARIES

The following is a list of the subsidiaries of Gibraltar Industries, Inc. as of December 31, 2021. The names of indirectly owned subsidiaries are indented under the names of their respective parent corporations:

Appleton Supply Company, Inc.		Delaware
D.S.B. Holding Corp.		Delaware
The D.S. Brown Company		Ohio
Florence Corporation		Illinois
	Florence Corporation of Kansas	Kansas
Gibraltar Industries Holding Company (UK) Limited		United Kingdom
	Renusol Gmbh	Germany
	Rough Brothers Greenhouse Manufacturing (Shanghai) Co., Ltd	China
	RBI Solar KK	Japan
Gibraltar Steel Corporation of New York		New York
	Southeastern Metals Manufacturing Company, Inc.	Florida
	Pacific Awards Metals, Inc.	California
	Noll/Norwesco, LLC	Delaware
	Air Vent Inc.	Delaware
Package Concierge, Inc.		Delaware
Rough Brothers Holding Co., Inc.		Ohio
	RBI Solar, Inc.	Ohio
	Renusol America, Inc.	Delaware
	SolarBOS	California
	TerraSmart, LLC	Florida
	Rough Brothers Manufacturing, Inc.	Ohio
	Prospiant, Inc.	Ohio
	Apeks, LLC	Ohio
	Thermo Energy Solutions, Inc.	Canada
Solar Group, Inc.		Delaware
	Architectural Mailboxes, LLC	Ohio