Adopts With Amendments
Chapter 16
Structural Design
International Residential Code 2021
[F] 1601.1 Scope
Section 1601.1 — Scope. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] 1601.1.1 Duct Systems Scope
Section 1601.1.1 — Duct Systems Scope. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] 1601.2 Duct System Design
Section 1601.2 — Duct System Design. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1601.2.1 Duct Materials
Section 1601.2.1 — Duct Materials. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1601.3 Return Air
Section 1601.3 — Return Air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 1601.4 Duct Sealing
Section 1601.4 — Duct Sealing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1602.1 Duct Materials
Section 1602.1 — Duct Materials. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1602.1.1 Return Air Sources
Section 1602.1.1 — Return Air Sources. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 1602.2 Flexible Duct
Section 1602.2 — Flexible Duct. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1602.2.1 Transfer Openings
Section 1602.2.1 — Transfer Openings. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 1602.3 Duct Panning
Section 1602.3 — Duct Panning. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1603.1 Duct Insulation
Section 1603.1 — Duct Insulation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1603.1.1 Duct Insulation
Section 1603.1.1 — Duct Insulation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1603.2 Vapor Retarders on Ducts
Section 1603.2 — Vapor Retarders on Ducts. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1604.1 Duct Sealing General
Section 1604.1 — Duct Sealing General. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1604.2 Duct Leakage Testing
Section 1604.2 — Duct Leakage Testing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] 1605.1 Return Air General
Section 1605.1 — Return Air General. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 1605.2 Return Air Openings
Section 1605.2 — Return Air Openings. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] 1606.1 Registers and Grilles
Section 1606.1 — Registers and Grilles. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1601.1 Duct Design
Section M1601.1 — Duct Design. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.1.1 Above-Ground Duct Systems
Section M1601.1.1 — Above-Ground Duct Systems. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.1.2 Underground Duct Systems
Section M1601.1.2 — Underground Duct Systems. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.2 Duct Materials
Section M1601.2 — Duct Materials. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.3 Duct Sizing
Section M1601.3 — Duct Sizing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.4 Duct Systems - Installation
Section M1601.4 — Duct Systems - Installation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.4.1 Duct Installation
Section M1601.4.1 — Duct Installation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.5 Duct Support
Section M1601.5 — Duct Support. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1601.6 Independent Garage HVAC
Section M1601.6 — Independent Garage HVAC. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1602.1 Return Air Supply
Section M1602.1 — Return Air Supply. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1602.2 Prohibited Sources
Section M1602.2 — Prohibited Sources. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1602.3 Return Air Pathways
Section M1602.3 — Return Air Pathways. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1603.1 Duct Insulation
Section M1603.1 — Duct Insulation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1603.2 Duct Sealing
Section M1603.2 — Duct Sealing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1603.3 Duct Leakage Testing
Section M1603.3 — Duct Leakage Testing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] M1701.1 Combustion Air Scope
Section M1701.1 — Combustion Air Scope. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] M1701.2 Combustion Air Methods
Section M1701.2 — Combustion Air Methods. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1702.1 Indoor Combustion Air
Section M1702.1 — Indoor Combustion Air. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1703.1 Outdoor Combustion Air - Two Openings
Section M1703.1 — Outdoor Combustion Air - Two Openings. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] M1703.2 Outdoor Combustion Air - Single Opening
Section M1703.2 — Outdoor Combustion Air - Single Opening. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] P2601.1 Plumbing General Scope
Section P2601.1 — Plumbing General Scope. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] P2602.1 Connections Required
Section P2602.1 — Connections Required. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] R1601.1 Scope Duct Systems IRC
Section R1601.1 — Scope Duct Systems IRC. This section establishes the scope, applicability, and administrative provisions for enforcement of this code. Refer to the official code text for complete requirements.
[F] R1601.1.1 Duct System Design
Section R1601.1.1 — Duct System Design. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1601.2 General Ducts
Section R1601.2 — General Ducts. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1602.1 Return Air Sources
Section R1602.1 — Return Air Sources. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] R1602.2 Prohibited Plenums
Section R1602.2 — Prohibited Plenums. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] R1603.1 Duct Construction
Section R1603.1 — Duct Construction. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1603.2 Flexible Ducts
Section R1603.2 — Flexible Ducts. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1604.1 Duct Insulation
Section R1604.1 — Duct Insulation. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1604.2 Duct Sealing
Section R1604.2 — Duct Sealing. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
[F] R1606.1 Wood-Frame Roof Construction
Section R1606.1 — Wood-Frame Roof Construction. This section specifies construction material requirements and standards. Refer to the official code for specific material specifications and testing standards. Refer to the official code text for complete requirements.
[F] R1606.2 Ceiling Joist and Rafter Connection
Section R1606.2 — Ceiling Joist and Rafter Connection. This section establishes specific code requirements. Refer to the official code text for detailed provisions, exceptions, and referenced standards. Refer to the official code text for complete requirements.
[F] R1607.1 Engineered Wood Products
Section R1607.1 — Engineered Wood Products. This section addresses mechanical system requirements including ventilation, ductwork, and equipment specifications. Refer to the official code text for complete requirements.
Code sections are sourced from the International Code Council (ICC) and NFPA. Refer to ICC Digital Codes or NFPA for the authoritative source documents.