§ IRC 2021 42 chapters · 407 entries
IRC 2021, in plain English.
407 IRC 2021 entries across 42 chapters, translated into plain language and cross-referenced to wiki entries and adjacent code sections. Pick a chapter to start.
§ 01 Chapters
42 chapters, explained.
Click any chapter for the entry list. Entry counts reflect what we currently have published; some chapters have more sections than entries because not every section has a dedicated explainer yet.
§
Chapter
Code reference
Entries
Chapter 1
Scope and Administration
IRC 2021 · Chapter 1
10
→
Chapter 2
Definitions
IRC 2021 · Chapter 2
10
→
Chapter 3
Building Planning
IRC 2021 · Chapter 3
22
→
Chapter 4
Foundations
IRC 2021 · Chapter 4
10
→
Chapter 5
Floors
IRC 2021 · Chapter 5
10
→
Chapter 6
Wall Construction
IRC 2021 · Chapter 6
11
→
Chapter 7
Wall Covering
IRC 2021 · Chapter 7
11
→
Chapter 8
Roof-Ceiling Construction
IRC 2021 · Chapter 8
10
→
Chapter 9
Roof Assemblies
IRC 2021 · Chapter 9
10
→
Chapter 10
Chimneys and Fireplaces
IRC 2021 · Chapter 10
10
→
Chapter 11
Energy Efficiency
IRC 2021 · Chapter 11
14
→
Chapter 12
Mechanical Administration
IRC 2021 · Chapter 12
8
→
Chapter 13
General Mechanical System Requirements
IRC 2021 · Chapter 13
8
→
Chapter 14
Heating and Cooling Equipment and Appliances
IRC 2021 · Chapter 14
9
→
Chapter 15
Exhaust Systems
IRC 2021 · Chapter 15
8
→
Chapter 16
Duct Systems
IRC 2021 · Chapter 16
8
→
Chapter 17
Combustion Air
IRC 2021 · Chapter 17
8
→
Chapter 18
Chimneys and Vents ? Mechanical
IRC 2021 · Chapter 18
8
→
Chapter 19
Special Fuel-Burning Equipment
IRC 2021 · Chapter 19
6
→
Chapter 20
Boilers and Water Heaters
IRC 2021 · Chapter 20
6
→
Chapter 21
Hydronic Piping
IRC 2021 · Chapter 21
6
→
Chapter 22
Special Piping and Storage Systems
IRC 2021 · Chapter 22
6
→
Chapter 23
Solar Thermal Energy Systems
IRC 2021 · Chapter 23
6
→
Chapter 24
Fuel Gas
IRC 2021 · Chapter 24
12
→
Chapter 25
Plumbing Administration
IRC 2021 · Chapter 25
9
→
Chapter 26
General Plumbing Requirements
IRC 2021 · Chapter 26
10
→
Chapter 27
Plumbing Fixtures
IRC 2021 · Chapter 27
11
→
Chapter 28
Water Heaters
IRC 2021 · Chapter 28
10
→
Chapter 29
Water Supply and Distribution
IRC 2021 · Chapter 29
10
→
Chapter 30
Sanitary Drainage
IRC 2021 · Chapter 30
10
→
Chapter 31
Vents
IRC 2021 · Chapter 31
21
→
Chapter 32
Traps
IRC 2021 · Chapter 32
11
→
Chapter 34
General Electrical Requirements
IRC 2021 · Chapter 34
8
→
Chapter 35
Electrical Definitions
IRC 2021 · Chapter 35
8
→
Chapter 36
Services
IRC 2021 · Chapter 36
8
→
Chapter 37
Branch Circuit and Feeder Requirements
IRC 2021 · Chapter 37
8
→
Chapter 38
Wiring Methods
IRC 2021 · Chapter 38
10
→
Chapter 39
Power and Lighting Distribution
IRC 2021 · Chapter 39
10
→
Chapter 40
Devices and Luminaires
IRC 2021 · Chapter 40
10
→
Chapter 41
Appliance Installation
IRC 2021 · Chapter 41
10
→
Chapter 42
Swimming Pools
IRC 2021 · Chapter 42
8
→
Chapter 43
Class 2 Remote-Control, Signaling and Power-Limited Circuits
IRC 2021 · Chapter 43
8
→
§ 02 Next