William P. Montague - 03 May 2022 Form 4 Insider Report for GIBRALTAR INDUSTRIES, INC. (ROCK)

Footnote F1

Represents shares of common stock which the Reporting Person is entitled to receive annually pursuant to the compensation program in effect for non-employee directors.

Footnote F2

Represents matching restricted stock units allocated to the Reporting Person after 2012 with respect to the Reporting Person's deferral of a portion of his annual retainer fee pursuant to the Company's Management Stock Purchase Plan.

Footnote F3

Restricted stock units are forfeited if Reporting Person's service as a director of the Company is terminated prior to age sixty (60). If service as a director continues through age sixty (60), restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service. Each restricted stock unit is converted to cash in an amount equal to the fair market value (200 day rolling average) of one share of the Company's common stock on the date of termination of the Reporting Person's service as a director of the Company.

Footnote F4

Represents matching restricted stock units allocated to the Reporting Person pursuant to the Company's Management Stock Purchase Plan equal in number to restricted stock units allocated to reflect the Reporting Person's deferral of a portion of his annual director retainer fee.

Footnote F5

Restricted stock units are forfeited if Reporting Person's service as a director of the Company is terminated prior to age sixty (60). If service as a director continues through age sixty (60), restricted stock units are payable solely in cash in five (5) consecutive, substantially equal annual installments, beginning in January of the year following the year in which termination of service occurs. Each restricted stock unit is converted to cash in an amount equal to the fair market value (200 day rolling average) of one share of the Company's common stock on the date of termination of the Reporting Person's service as a director of the Company.

Footnote F6

Represents restricted stock units allocated to the Reporting Person after 2012 pursuant to the Company's Management Stock Purchase Plan to reflect the Reporting Person's deferral of a portion of his annual director retainer fee.

Footnote F7

Restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service as a director of the Company. Each restricted stock unit is converted to cash in an amount equal to the fair market value (200 day rolling average) of one share of the Company's common stock on the date of termination of the Reporting Person's service as a director of the Company.

Footnote F8

Represents restricted stock units allocated to Reporting Person pursuant to the Company's Management Stock Purchase Plan reflecting deferred annual director fees.

Footnote F9

Restricted stock units are payable solely in cash in five (5) consecutive, substantially equal annual installments beginning in January of the year following the year in which termination of service as a member of the Company's Board of Directors occurs. Each restricted stock unit is converted to cash in an amount equal to the fair market value (200 day rolling average) of one share of the Company's common stock on the date of termination of the Reporting Person's service as a director of the Company.