2021 International Residential Code for One- and Two-Family Dwellings – IRC-2021
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The 2021 International Residential Code® (IRC) sets minimum requirements for one- and two-family dwellings and townhouses up to three stories. This official ICC model code consolidates building, mechanical, plumbing, energy, fuel gas, and electrical standards into one unified guide for home construction compliance.
Highlights:
- Covers structural, mechanical, plumbing, HVAC, energy, and electrical systems
- Offers both prescriptive rules and performance-based design flexibility
- Aligns with 2021 I-Codes® for integrated, multi-discipline compliance
- Includes updated energy provisions (NFPA 70, IECC) and appendices for solar, radon, and 3D-printed construction
Who It’s For:
Builders, code officials, engineers, and inspectors involved in residential code compliance, permitting, inspection preparation, or professional reference.
IRC-2021
The 2021 International Residential Code® (IRC) sets minimum requirements for one- and two-family dwellings and townhouses up to three stories. This official ICC model code consolidates building, mechanical, plumbing, energy, fuel gas, and electrical standards into one unified guide for home construction compliance.
Highlights:
- Covers structural, mechanical, plumbing, HVAC, energy, and electrical systems
- Offers both prescriptive rules and performance-based design flexibility
- Aligns with 2021 I-Codes® for integrated, multi-discipline compliance
- Includes updated energy provisions (NFPA 70, IECC) and appendices for solar, radon, and 3D-printed construction
Who It’s For:
Builders, code officials, engineers, and inspectors involved in residential code compliance, permitting, inspection preparation, or professional reference.
IRC-2021
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2021 International Energy Conservation Code – IECC-2021
The 2021 International Energy Conservation Code® (IECC) sets the baseline for energy-efficient design and construction of new buildings, as well as additions and alterations to existing residential and commercial structures. It features separate residential and commercial provisions and is fully integrated with the 2021 I-Codes for coordinated compliance.
Highlights:
- Divides content into Residential (≤3 stories) and Commercial sections for targeted regulation
- Includes multiple compliance paths: prescriptive, performance-based, and Energy Rating Index (ERI)
- Updated climate zone data affects insulation and system efficiency by region
- New requirements for air barriers, insulation materials, and fenestration U-factor/SHGC
- Enhanced HVAC efficiency standards and ventilation control requirements
- Revised lighting power limits, daylighting controls, and sensor use for commercial spaces
- Strengthened water heating system insulation and controls for energy savings
- Specific provisions for renovations, historic buildings, and changes in use
- Expanded commissioning requirements and documentation protocols
- Optional appendices for solar-ready design and zero energy building frameworks
Who It’s For:
Architects, energy consultants, engineers, and code officials seeking to meet energy efficiency standards for code-compliant, sustainable buildings.
IECC-2021
2021 International Energy Conservation Code – IECC-2021
The 2021 International Energy Conservation Code® (IECC) sets the baseline for energy-efficient design and construction of new buildings, as well as additions and alterations to existing residential and commercial structures. It features separate residential and commercial provisions and is fully integrated with the 2021 I-Codes for coordinated compliance.
Highlights:
- Divides content into Residential (≤3 stories) and Commercial sections for targeted regulation
- Includes multiple compliance paths: prescriptive, performance-based, and Energy Rating Index (ERI)
- Updated climate zone data affects insulation and system efficiency by region
- New requirements for air barriers, insulation materials, and fenestration U-factor/SHGC
- Enhanced HVAC efficiency standards and ventilation control requirements
- Revised lighting power limits, daylighting controls, and sensor use for commercial spaces
- Strengthened water heating system insulation and controls for energy savings
- Specific provisions for renovations, historic buildings, and changes in use
- Expanded commissioning requirements and documentation protocols
- Optional appendices for solar-ready design and zero energy building frameworks
Who It’s For:
Architects, energy consultants, engineers, and code officials seeking to meet energy efficiency standards for code-compliant, sustainable buildings.
IECC-2021
2021 International Mechanical Code – IMC-2021
The 2021 International Mechanical Code® (IMC) establishes minimum standards for the design, installation, and maintenance of mechanical systems in residential, commercial, and industrial buildings. Covering everything from HVAC and ventilation to boilers and refrigeration, the IMC ensures safe, efficient, and code-compliant system operation. Fully coordinated with the 2021 I-Codes.
Highlights:
- Updated rules for appliance access, clearances, condensate drainage, and temperature control
- Comprehensive ventilation standards for occupied and unoccupied spaces, including hospitals and hazardous locations
- Detailed exhaust system requirements for kitchens, dryers, labs, garages, and smoke/grease control
- Regulates duct construction, dampers, insulation, filters, and fire/smoke control systems
- Refers to NFPA and IFGC standards for combustion air; includes chimney and flue guidance
- Covers installation standards for fireplaces, cooking appliances, sauna heaters, and fuel cells
- Includes safety and design rules for boilers, pressure vessels, relief valves, and tanks
- Establishes refrigeration system classification, design, piping, and testing procedures
- Provides hydronic system guidance for hot/chilled water piping, antifreeze, and insulation
- Sets safety standards for fuel oil piping, storage, and solar thermal systems
- Appendices include permit fee schedules, chimney diagrams, and appeal procedures
Who It’s For:
Mechanical contractors, engineers, inspectors, and HVAC professionals working on code-compliant building system design, installation, and maintenance.
IMC-2021
2021 International Mechanical Code – IMC-2021
The 2021 International Mechanical Code® (IMC) establishes minimum standards for the design, installation, and maintenance of mechanical systems in residential, commercial, and industrial buildings. Covering everything from HVAC and ventilation to boilers and refrigeration, the IMC ensures safe, efficient, and code-compliant system operation. Fully coordinated with the 2021 I-Codes.
Highlights:
- Updated rules for appliance access, clearances, condensate drainage, and temperature control
- Comprehensive ventilation standards for occupied and unoccupied spaces, including hospitals and hazardous locations
- Detailed exhaust system requirements for kitchens, dryers, labs, garages, and smoke/grease control
- Regulates duct construction, dampers, insulation, filters, and fire/smoke control systems
- Refers to NFPA and IFGC standards for combustion air; includes chimney and flue guidance
- Covers installation standards for fireplaces, cooking appliances, sauna heaters, and fuel cells
- Includes safety and design rules for boilers, pressure vessels, relief valves, and tanks
- Establishes refrigeration system classification, design, piping, and testing procedures
- Provides hydronic system guidance for hot/chilled water piping, antifreeze, and insulation
- Sets safety standards for fuel oil piping, storage, and solar thermal systems
- Appendices include permit fee schedules, chimney diagrams, and appeal procedures
Who It’s For:
Mechanical contractors, engineers, inspectors, and HVAC professionals working on code-compliant building system design, installation, and maintenance.
IMC-2021
AWS D1.1/D1.1M:2020 – Structural Welding Code – Steel
AWS D1.1/D1.1M:2020 – Structural Welding Code – Steel is the 24th edition of the code and serves as the definitive standard for welding carbon and low-alloy steel structures. Approved by ANSI and published by the American Welding Society, it reflects the latest best practices in structural welding design, fabrication, and inspection.
Highlights:
- Welding requirements for carbon and low-alloy steels
- Design criteria for welded joints in tubular and nontubular members
- Prequalification standards for Welding Procedure Specifications (WPS)
- Qualification tests for welding procedures and personnel
- Rules for fabrication, inspection, repair, and stud welding
- Guidance for strengthening and retrofitting existing structures
- Covers steel 1/8 in [3 mm] or thicker, up to 100 ksi [690 MPa] yield strength
- Includes mandatory clauses, normative and informative annexes, and detailed commentary
Who It’s For:
Structural engineers, welders, inspectors, and contractors engaged in the design, construction, and quality control of welded steel structures in buildings, bridges, towers, and industrial facilities.
AWS D1.1/D1.1M:2020
AWS D1.1/D1.1M:2020 – Structural Welding Code – Steel
AWS D1.1/D1.1M:2020 – Structural Welding Code – Steel is the 24th edition of the code and serves as the definitive standard for welding carbon and low-alloy steel structures. Approved by ANSI and published by the American Welding Society, it reflects the latest best practices in structural welding design, fabrication, and inspection.
Highlights:
- Welding requirements for carbon and low-alloy steels
- Design criteria for welded joints in tubular and nontubular members
- Prequalification standards for Welding Procedure Specifications (WPS)
- Qualification tests for welding procedures and personnel
- Rules for fabrication, inspection, repair, and stud welding
- Guidance for strengthening and retrofitting existing structures
- Covers steel 1/8 in [3 mm] or thicker, up to 100 ksi [690 MPa] yield strength
- Includes mandatory clauses, normative and informative annexes, and detailed commentary
Who It’s For:
Structural engineers, welders, inspectors, and contractors engaged in the design, construction, and quality control of welded steel structures in buildings, bridges, towers, and industrial facilities.
AWS D1.1/D1.1M:2020
2021 International Existing Building Code – IEBC-2021
The 2021 International Existing Building Code® (IEBC) offers a consistent, performance-based framework for repairing, altering, adding to, or changing the occupancy of existing buildings. It facilitates the reuse of older and historic structures while maintaining safety, accessibility, and code compliance without requiring full adherence to new construction standards.
Highlights:
- Limits storm shelter capacity to specific occupancies; removes travel distance requirement
- Requires IBC Chapter 14/26 compliance for major exterior wall replacements
- Mandates snow load evaluation when structural repairs involve substantial damage
- Applies enhanced classroom acoustics to educational buildings undergoing major alterations
- Permits rooftop equipment additions without full structural review under specific weight/load limits
- Requires seismic evaluation when changing occupancy from S or U to other types
- Exempts furniture like cubicles and shelving from permits and Level 2 classification
- Revises sprinkler installation thresholds for Level 2 and Level 3 alterations in high-risk areas
Who It’s For:
Contractors, architects, and code officials working on renovations, adaptive reuse, and code compliance for existing buildings—especially where full new-construction standards are impractical.
IEBC-2021
2021 International Existing Building Code – IEBC-2021
The 2021 International Existing Building Code® (IEBC) offers a consistent, performance-based framework for repairing, altering, adding to, or changing the occupancy of existing buildings. It facilitates the reuse of older and historic structures while maintaining safety, accessibility, and code compliance without requiring full adherence to new construction standards.
Highlights:
- Limits storm shelter capacity to specific occupancies; removes travel distance requirement
- Requires IBC Chapter 14/26 compliance for major exterior wall replacements
- Mandates snow load evaluation when structural repairs involve substantial damage
- Applies enhanced classroom acoustics to educational buildings undergoing major alterations
- Permits rooftop equipment additions without full structural review under specific weight/load limits
- Requires seismic evaluation when changing occupancy from S or U to other types
- Exempts furniture like cubicles and shelving from permits and Level 2 classification
- Revises sprinkler installation thresholds for Level 2 and Level 3 alterations in high-risk areas
Who It’s For:
Contractors, architects, and code officials working on renovations, adaptive reuse, and code compliance for existing buildings—especially where full new-construction standards are impractical.
IEBC-2021