International Energy Conservation Code 2012 (IECC 2012)

Last updated: 27 February 2019
Commercial Energy Efficiency Code

Insulation and Fenestration Criteria
The building thermal envelope shall meet the requirements of Tables C402.2 and C402.3 based on the climate zone specified in Chapter 3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the “Group R” column of Table C402.2. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the “All other” column of Table C402.2. Buildings with a vertical fenestration area or skylight area that exceeds that allowed in Table C402.3 shall comply with the building envelope provisions of ANSI/ASHRAE/IESNA 90.1.
Specific Insulation Requirements (Prescriptive)
Opaque assemblies shall comply with Table C402.2. Where two or more layers of continuous insulation board are used in a construction assembly, the continuous insulation boards shall be installed in accordance with Section C303.2. If the continuous insulation board manufacturer’s installation instructions do not address installation of two or more layers, the edge joints between each layer of continuous insulation boards shall be staggered.
Fenestration (Prescriptive)
Fenestration shall comply with Table C402.3. Automatic daylighting controls specified by this section shall comply with Section C405.2.2.3.2.
Air Leakage (Mandatory)
The thermal envelope of buildings shall comply with Sections C402.4.1 through C402.4.8.
Service Water Heating (Mandatory)
Water-heating equipment and hot water storage tanks shall meet the requirements of Table C404.2. The efficiency shall be verified through data furnished by the manufacturer or through certification under an approved certification program.
Lighting Controls (Mandatory)
Lighting systems shall be provided with controls as specified in Sections C405.2.1, C405.2.2, C405.2.3 and C405.2.4.
On-Site Renewable Energy
Total minimum ratings of on-site renewable energy systems shall comply with one of the following:
1. Provide not less than 1.75 Btu (1850 W), or not less than 0.50 watts per square foot (5.4 W/m2) of conditioned floor area.
2. Provide not less than 3 percent of the energy used within the building for building mechanical and service water heating equipment and lighting regulated in this chapter.
Total Building Performance
Compliance with this section requires that the criteria of Sections C402.4, C403.2, C404 and C405 be met.

Residential Energy Efficiency Code

Insulation and Fenestration Criteria
The building thermal envelope shall meet the requirements of Table R402.1.1 based on the climate zone specified in Chapter 3.
Specific Insulation Requirements (Prescriptive)
In addition to the requirements of Section R402.1, insulation shall meet the specific requirements of Sections R402.2.1 through R402.2.12.
Fenestration (Prescriptive)
In addition to the requirements of Section R402, fenestration shall comply with Sections R402.3.1 through R402.3.6.
Air Leakage (Mandatory)
The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections R402.4.1 through R402.4.4.
Service Hot Water Systems
Energy conservation measures for service hot water systems shall be in accordance with Sections R403.4.1 and R403.4.2.
Circulating hot water systems shall be provided with an automatic or readily accessible manual switch that can turn off the hot-water circulating pump when the system is not in use.
Mechanical Ventilation (Mandatory)
The building shall be provided with ventilation that meets the requirements of the International Residential Code or International Mechanical Code, as applicable, or with other approved means of ventilation. Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.
Lighting Equipment (Mandatory)
A minimum of 75 percent of the lamps in permanently installed ligh

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End uses covered
  • Building end-uses
  • Building systems
  • Space heating
  • Space cooling
  • Ventilation
  • Water heating
  • Lighting
  • Building vintage
  • Energy management systems (buildings)
  • Building envelope