SEC EDGAR Submission 0000912562-21-000040

<SEC-DOCUMENT>0000912562-21-000040-index.html : 20211117
<SEC-HEADER>0000912562-21-000040.hdr.sgml : 20211117
<ACCEPTANCE-DATETIME>20211117073234
ACCESSION NUMBER:		0000912562-21-000040
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		98
CONFORMED PERIOD OF REPORT:	20211117
ITEM INFORMATION:		Regulation FD Disclosure
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20211117
DATE AS OF CHANGE:		20211117

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GIBRALTAR INDUSTRIES, INC.
		CENTRAL INDEX KEY:			0000912562
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
		IRS NUMBER:				161445150
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22462
		FILM NUMBER:		211418419

	BUSINESS ADDRESS:	
		STREET 1:		3556 LAKE SHORE ROAD
		STREET 2:		P O BOX 2028
		CITY:			BUFFALO
		STATE:			NY
		ZIP:			14219-0228
		BUSINESS PHONE:		7168266500

	MAIL ADDRESS:	
		STREET 1:		GATEWAY EXECUTIVE PARK
		STREET 2:		3556 LAKE SHORE ROAD PO BOX 2028
		CITY:			BUFFALO
		STATE:			NY
		ZIP:			14219-0228

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GIBRALTAR STEEL CORP
		DATE OF NAME CHANGE:	19930924
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>rock-20211117.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: rock-20211117.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>exhibit991-investordaypr.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: exhibit991-investordaypr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>3
<FILENAME>rock-20211117.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
<TEXT>
Document 3 - file: rock-20211117.xsd

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>4
<FILENAME>rock-20211117_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
<TEXT>
Document 4 - file: rock-20211117_lab.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>5
<FILENAME>rock-20211117_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
<TEXT>
Document 5 - file: rock-20211117_pre.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>exhibit991-investordaypr001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: exhibit991-investordaypr001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>exhibit991-investordaypr002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: exhibit991-investordaypr002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>exhibit991-investordaypr003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: exhibit991-investordaypr003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>exhibit991-investordaypr004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: exhibit991-investordaypr004.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>exhibit991-investordaypr005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: exhibit991-investordaypr005.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>exhibit991-investordaypr006.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: exhibit991-investordaypr006.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>exhibit991-investordaypr007.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: exhibit991-investordaypr007.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>exhibit991-investordaypr008.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: exhibit991-investordaypr008.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>exhibit991-investordaypr009.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: exhibit991-investordaypr009.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>exhibit991-investordaypr010.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: exhibit991-investordaypr010.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>exhibit991-investordaypr011.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 16 - file: exhibit991-investordaypr011.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>exhibit991-investordaypr012.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: exhibit991-investordaypr012.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>18
<FILENAME>exhibit991-investordaypr013.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 18 - file: exhibit991-investordaypr013.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>19
<FILENAME>exhibit991-investordaypr014.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 19 - file: exhibit991-investordaypr014.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>20
<FILENAME>exhibit991-investordaypr015.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 20 - file: exhibit991-investordaypr015.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>21
<FILENAME>exhibit991-investordaypr016.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 21 - file: exhibit991-investordaypr016.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>22
<FILENAME>exhibit991-investordaypr017.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 22 - file: exhibit991-investordaypr017.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>23
<FILENAME>exhibit991-investordaypr018.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 23 - file: exhibit991-investordaypr018.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>24
<FILENAME>exhibit991-investordaypr019.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 24 - file: exhibit991-investordaypr019.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>25
<FILENAME>exhibit991-investordaypr020.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 25 - file: exhibit991-investordaypr020.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>26
<FILENAME>exhibit991-investordaypr021.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 26 - file: exhibit991-investordaypr021.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>27
<FILENAME>exhibit991-investordaypr022.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 27 - file: exhibit991-investordaypr022.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>28
<FILENAME>exhibit991-investordaypr023.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 28 - file: exhibit991-investordaypr023.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>29
<FILENAME>exhibit991-investordaypr024.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 29 - file: exhibit991-investordaypr024.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>30
<FILENAME>exhibit991-investordaypr025.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 30 - file: exhibit991-investordaypr025.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>31
<FILENAME>exhibit991-investordaypr026.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 31 - file: exhibit991-investordaypr026.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>32
<FILENAME>exhibit991-investordaypr027.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 32 - file: exhibit991-investordaypr027.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>33
<FILENAME>exhibit991-investordaypr028.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 33 - file: exhibit991-investordaypr028.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>34
<FILENAME>exhibit991-investordaypr029.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 34 - file: exhibit991-investordaypr029.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>35
<FILENAME>exhibit991-investordaypr030.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 35 - file: exhibit991-investordaypr030.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>36
<FILENAME>exhibit991-investordaypr031.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 36 - file: exhibit991-investordaypr031.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>37
<FILENAME>exhibit991-investordaypr032.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 37 - file: exhibit991-investordaypr032.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>38
<FILENAME>exhibit991-investordaypr033.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 38 - file: exhibit991-investordaypr033.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>39
<FILENAME>exhibit991-investordaypr034.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 39 - file: exhibit991-investordaypr034.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>40
<FILENAME>exhibit991-investordaypr035.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 40 - file: exhibit991-investordaypr035.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>41
<FILENAME>exhibit991-investordaypr036.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 41 - file: exhibit991-investordaypr036.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>42
<FILENAME>exhibit991-investordaypr037.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 42 - file: exhibit991-investordaypr037.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>43
<FILENAME>exhibit991-investordaypr038.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 43 - file: exhibit991-investordaypr038.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>44
<FILENAME>exhibit991-investordaypr039.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 44 - file: exhibit991-investordaypr039.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>45
<FILENAME>exhibit991-investordaypr040.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 45 - file: exhibit991-investordaypr040.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>46
<FILENAME>exhibit991-investordaypr041.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 46 - file: exhibit991-investordaypr041.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>47
<FILENAME>exhibit991-investordaypr042.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 47 - file: exhibit991-investordaypr042.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>48
<FILENAME>exhibit991-investordaypr043.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 48 - file: exhibit991-investordaypr043.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>49
<FILENAME>exhibit991-investordaypr044.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 49 - file: exhibit991-investordaypr044.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>50
<FILENAME>exhibit991-investordaypr045.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 50 - file: exhibit991-investordaypr045.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>51
<FILENAME>exhibit991-investordaypr046.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 51 - file: exhibit991-investordaypr046.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>52
<FILENAME>exhibit991-investordaypr047.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 52 - file: exhibit991-investordaypr047.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>53
<FILENAME>exhibit991-investordaypr048.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 53 - file: exhibit991-investordaypr048.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>54
<FILENAME>exhibit991-investordaypr049.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 54 - file: exhibit991-investordaypr049.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>55
<FILENAME>exhibit991-investordaypr050.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 55 - file: exhibit991-investordaypr050.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>56
<FILENAME>exhibit991-investordaypr051.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 56 - file: exhibit991-investordaypr051.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>57
<FILENAME>exhibit991-investordaypr052.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 57 - file: exhibit991-investordaypr052.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>58
<FILENAME>exhibit991-investordaypr053.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 58 - file: exhibit991-investordaypr053.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>59
<FILENAME>exhibit991-investordaypr054.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 59 - file: exhibit991-investordaypr054.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>60
<FILENAME>exhibit991-investordaypr055.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 60 - file: exhibit991-investordaypr055.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>61
<FILENAME>exhibit991-investordaypr056.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 61 - file: exhibit991-investordaypr056.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>62
<FILENAME>exhibit991-investordaypr057.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 62 - file: exhibit991-investordaypr057.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>63
<FILENAME>exhibit991-investordaypr058.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 63 - file: exhibit991-investordaypr058.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>64
<FILENAME>exhibit991-investordaypr059.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 64 - file: exhibit991-investordaypr059.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>65
<FILENAME>exhibit991-investordaypr060.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 65 - file: exhibit991-investordaypr060.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>66
<FILENAME>exhibit991-investordaypr061.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 66 - file: exhibit991-investordaypr061.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>67
<FILENAME>exhibit991-investordaypr062.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 67 - file: exhibit991-investordaypr062.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>68
<FILENAME>exhibit991-investordaypr063.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 68 - file: exhibit991-investordaypr063.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>69
<FILENAME>exhibit991-investordaypr064.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 69 - file: exhibit991-investordaypr064.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>70
<FILENAME>exhibit991-investordaypr065.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 70 - file: exhibit991-investordaypr065.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>71
<FILENAME>exhibit991-investordaypr066.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 71 - file: exhibit991-investordaypr066.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>72
<FILENAME>exhibit991-investordaypr067.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 72 - file: exhibit991-investordaypr067.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>73
<FILENAME>exhibit991-investordaypr068.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 73 - file: exhibit991-investordaypr068.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>74
<FILENAME>exhibit991-investordaypr069.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 74 - file: exhibit991-investordaypr069.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>75
<FILENAME>exhibit991-investordaypr070.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 75 - file: exhibit991-investordaypr070.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>76
<FILENAME>exhibit991-investordaypr071.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 76 - file: exhibit991-investordaypr071.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>77
<FILENAME>exhibit991-investordaypr072.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 77 - file: exhibit991-investordaypr072.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>78
<FILENAME>exhibit991-investordaypr073.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 78 - file: exhibit991-investordaypr073.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>79
<FILENAME>exhibit991-investordaypr074.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 79 - file: exhibit991-investordaypr074.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>80
<FILENAME>exhibit991-investordaypr075.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 80 - file: exhibit991-investordaypr075.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>81
<FILENAME>exhibit991-investordaypr076.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 81 - file: exhibit991-investordaypr076.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>82
<FILENAME>exhibit991-investordaypr077.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 82 - file: exhibit991-investordaypr077.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>83
<FILENAME>exhibit991-investordaypr078.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 83 - file: exhibit991-investordaypr078.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>84
<FILENAME>exhibit991-investordaypr079.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 84 - file: exhibit991-investordaypr079.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>85
<FILENAME>exhibit991-investordaypr080.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 85 - file: exhibit991-investordaypr080.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>86
<FILENAME>exhibit991-investordaypr081.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 86 - file: exhibit991-investordaypr081.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>87
<FILENAME>exhibit991-investordaypr082.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 87 - file: exhibit991-investordaypr082.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>88
<FILENAME>exhibit991-investordaypr083.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 88 - file: exhibit991-investordaypr083.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>89
<FILENAME>exhibit991-investordaypr084.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 89 - file: exhibit991-investordaypr084.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>90
<FILENAME>exhibit991-investordaypr085.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 90 - file: exhibit991-investordaypr085.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>91
<FILENAME>rock-20211117_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 91 - file: rock-20211117_htm.html

Document 91 - RAW XML: rock-20211117_htm.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>92
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 92 - file: R1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>93
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 93 - file: Financial_Report.xlsx

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>94
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 94 - file: Show.js

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>95
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 95 - file: report.css

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>96
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 96 - file: FilingSummary.html

Document 96 - RAW XML: FilingSummary.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>98
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 98 - file: MetaLinks.json

</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>99
<FILENAME>0000912562-21-000040-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 99 - file: 0000912562-21-000040-xbrl.zip

</DOCUMENT>
</SEC-DOCUMENT>