2021 International Energy Conservation Code International Code (IECC) Council

,
, TABLE OF CONTENTS

IECC—COMMERCIAL PROVISIONS . . . . . . . . . . . . C-i IECC—RESIDENTIAL PROVISIONS . . . . . . . . . . . . R-i

CHAPTER 1 SCOPE AND CHAPTER 1 SCOPE AND
ADMINISTRATION. . . . . . . . . . . .C1-1 ADMINISTRATION . . . . . . . . . . . R1-1

CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . .C2-1 CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . R2-1

CHAPTER 3 GENERAL REQUIREMENTS . . .C3-1 CHAPTER 3 GENERAL REQUIREMENTS. . . R3-1

CHAPTER 4 COMMERCIAL ENERGY CHAPTER 4 RESIDENTIAL ENERGY
EFFICIENCY . . . . . . . . . . . . . . . . .C4-1 EFFICIENCY . . . . . . . . . . . . . . . . . R4-1

CHAPTER 5 EXISTING BUILDINGS . . . . . . . .C5-1 CHAPTER 5 EXISTING BUILDINGS . . . . . . . . R5-1

CHAPTER 6 REFERENCED STANDARDS . . .C6-1 CHAPTER 6 REFERENCED STANDARDS . . . R6-1

APPENDIX CA BOARD OF APPEALS— APPENDIX RA BOARD OF APPEALS—
COMMERCIAL . . APPENDIX CA-1 RESIDENTIAL . . . .APPENDIX RA-1

APPENDIX CB SOLAR-READY ZONE— APPENDIX RB SOLAR-READY
COMMERCIAL . . APPENDIX CB-1 PROVISIONS—DETACHED
ONE- AND TWO-FAMILY
APPENDIX CC ZERO ENERGY DWELLINGS AND
COMMERCIAL TOWNHOUSES . . . APPENDIX RB-1
BUILDING
PROVISIONS. . . . . APPENDIX CC-1 APPENDIX RC ZERO ENERGY
RESIDENTIAL BUILDING
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .INDEX C-1 PROVISIONS . . . . . APPENDIX RC-1

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX R-1




2021 INTERNATIONAL ENERGY CONSERVATION CODE® xv

, IECC—COMMERCIAL PROVISIONS

TABLE OF CONTENTS

CHAPTER 1 SCOPE AND C405 Electrical Power and Lighting Systems . . . . . . C4-59
ADMINISTRATION . . . . . . . . . . . . C1-1 C406 Additional Efficiency Requirements. . . . . . . . . C4-76
C407 Total Building Performance . . . . . . . . . . . . . . . C4-84
PART 1—SCOPE AND APPLICATION . . . . . . . . C1-1
C408 Maintenance Information and
Section System Commissioning. . . . . . . . . . . . . . . . . C4-91
C101 Scope and General Requirements . . . . . . . . . . . .C1-1
C102 Alternative Materials, Design and Methods of CHAPTER 5 EXISTING BUILDINGS . . . . . . . . . C5-1
Construction and Equipment . . . . . . . . . . . . . .C1-1 Section
C501 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C5-1
PART 2—ADMINISTRATION AND
C502 Additions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C5-1
ENFORCEMENT . . . . . . . . . . . . . . . . . . . C1-1
C503 Alterations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C5-2
Section
C504 Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C5-3
C103 Construction Documents . . . . . . . . . . . . . . . . . . .C1-1
C505 Change of Occupancy or Use . . . . . . . . . . . . . . . C5-3
C104 Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C1-3
C105 Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C1-3
CHAPTER 6 REFERENCED STANDARDS . . . . C6-1
C106 Notice of Approval . . . . . . . . . . . . . . . . . . . . . . .C1-4
C107 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C1-4 APPENDIX CA BOARD OF APPEALS—
C108 Referenced Standards. . . . . . . . . . . . . . . . . . . . . .C1-4 COMMERCIAL . . .APPENDIX CA-1
C109 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . .C1-4 Section
C110 Board of Appeals . . . . . . . . . . . . . . . . . . . . . . . . .C1-4 CA101 General. . . . . . . . . . . . . . . . . . . . APPENDIX CA-1

CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . C2-1 APPENDIX CB SOLAR-READY ZONE—
Section COMMERCIAL . . . APPENDIX CB-1
C201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C2-1 Section
C202 General Definitions . . . . . . . . . . . . . . . . . . . . . . .C2-1 CB101 Scope . . . . . . . . . . . . . . . . . . . . . APPENDIX CB-1
CB102 General Definition . . . . . . . . . . . APPENDIX CB-1
CHAPTER 3 GENERAL REQUIREMENTS . . . C3-1 CB103 Solar-ready Zone . . . . . . . . . . . . APPENDIX CB-1
Section
C301 Climate Zones . . . . . . . . . . . . . . . . . . . . . . . . . . .C3-1 APPENDIX CC ZERO ENERGY
COMMERCIAL
C302 Design Conditions . . . . . . . . . . . . . . . . . . . . . . .C3-36
BUILDING
C303 Materials, Systems and Equipment . . . . . . . . . .C3-36 PROVISIONS. . . . . .APPENDIX CC-1
Section
CHAPTER 4 COMMERCIAL ENERGY
CC101 General. . . . . . . . . . . . . . . . . . . . APPENDIX CC-1
EFFICIENCY . . . . . . . . . . . . . . . . . . C4-1
CC102 Definitions . . . . . . . . . . . . . . . . . APPENDIX CC-1
Section
CC103 Minimum Renewable Energy . . APPENDIX CC-1
C401 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C4-1
C402 Building Envelope Requirements . . . . . . . . . . . .C4-1
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX C-1
C403 Building Mechanical Systems . . . . . . . . . . . . . .C4-14
C404 Service Water Heating . . . . . . . . . . . . . . . . . . . .C4-55


2021 INTERNATIONAL ENERGY CONSERVATION CODE® C-i