ADOPTS WITH AMENDMENTS:

International Energy Conservation Code 2015 (IECC 2015)

IECC — Commercial Provisions

IECC — Residential Provisions

Heads up: There are no amended sections in this chapter.

R501.1 Scope

AMENDMENT
This section has been amended at the state or city level.
The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing buildings and structures. When a section is identified to apply, the subsections to that section also apply.
Additions, alterations, or repairs to an existing building, building system or portion thereof shall comply with Section R502, R503 or R504. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.
Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.

R501.3 Maintenance

AMENDMENT
This section has been amended at the state or city level.

R501.4 Compliance

AMENDMENT
This section has been amended at the state or city level.
Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in the International Residential Code, International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code, the North Carolina Existing Building Code and NFPA 70.
Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided hazards to life, health or property are not created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.

R501.6 Historic Buildings

AMENDMENT
This section has been amended at the state or city level.
No provision of this code relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall be mandatory for historic buildings.
Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this code. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code where the addition alone complies, where the existing building and addition comply with this code as a single building, or where the building with the addition uses no more energy than the existing building. Additions shall be in accordance with Section R502.1.1 or R502.1.2.
Additions shall comply with Sections R502.1.1.1 through R502.1.1.4.

R502.1.1.1 Building Envelope

AMENDMENT
This section has been amended at the state or city level.
New building thermal envelope assemblies that are part of the addition shall comply with Sections R402.1, R402.2, R402.3.1 through R402.3.5, and R402.4.

R502.1.1.2 Heating and Cooling Systems

AMENDMENT
This section has been amended at the state or city level.
New heating, cooling and duct systems that are part of the addition shall comply with Sections R403.1, R403.2, R403.3, R403.4 and R403.6. New heating and cooling appliances shall be sized in accordance with Section R403.7. Extensions of ducts from an existing system to a new addition shall require that the existing system be evaluated for the new design.

Exception: Installation of an addition to an existing duct system shall not require a duct leakage test.
New service hot water systems that are part of the addition shall comply with Section R403.5.
New lighting systems that are part of the addition shall comply with Section R404.1.

R502.1.2 Existing Plus Addition Compliance ( Simulated Performance Alternative )

AMENDMENT
This section has been amended at the state or city level.
The addition shall comply with Section R405, as applicable.

R503.1 General

AMENDMENT
This section has been amended at the state or city level.
Alterations to an existing building, building system or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall not create an unsafe or hazardous condition or overload existing building systems. Alterations to existing buildings shall comply with Sections R503.1.1 through R503.2.

R503.1.1 Building Envelope

AMENDMENT
This section has been amended at the state or city level.
Building envelope assemblies that are part of the alteration shall comply with Section R402.1.2 or R402.1.4, Sections R402.2.1 through R402.2.15, R402.3.1, R402.3.2, R402.4.4 and R402.4.6.

Exception: The following alterations to conditioned spaces need not comply with the requirements for new construction provided the energy use of the building is not increased:
  1. Storm windows installed over existing fenestration.
  2. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation. Roof systems requiring air space for ventilation shall retain the ventilation space required.
  3. Construction where the existing roof, wall or floor cavity is not exposed.
  4. Roof recover and roof replacement such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration.
  5. Deleted.
  6. Surface-applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain.
  7. Converting unconditioned attic space to conditioned attic space for one- and two-family dwellings and townhouses. Ceilings shall be insulated to a minimum of R-30, walls shall be insulated to the exterior wall requirements in Table R402.1.2 or Table R402.1.4 and follow the backing requirements in Sections R402.2.14 and R402.2.15.

R503.1.1.1 Replacement Fenestration

AMENDMENT
This section has been amended at the state or city level.
Where an entire existing fenestration unit is replaced with a new fenestration product, including frame, sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table R402.1.2.

Exception: Alterations that replace less than 50 percent of entire fenestration units may be replaced with like or better fenestration units to match existing fenestration assemblies.

R503.1.2 Heating and Cooling Systems

AMENDMENT
This section has been amended at the state or city level.
New heating, cooling and duct systems that are part of the alteration shall comply with Sections R403.1, R403.2, R403.3, R403.4, R403.6 and R403.7.

Exception: An alteration involving a partial system replacement to an existing duct system shall not require a duct leakage test.

R503.1.3 Service Hot Water Systems

AMENDMENT
This section has been amended at the state or city level.
New service hot water systems that are part of the alteration shall comply with Section R403.5.
New lighting systems that are part of the alteration shall comply with Section 404.1.
Exception: Alterations that replace less than 50 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.

R503.2 Change in Space Conditioning

AMENDMENT
This section has been amended at the state or city level.
New work performed shall meet the requirements of this code. Projects changing unconditioned space to conditioned space and costing more than $10,000 shall require 10 percent of the project cost to be used toward meeting the requirements of Chapter 11 of the North Carolina Residential Code for one- and two-family dwellings and townhouses or the North Carolina Energy Conservation Code. Project costs for the purpose of this section is the total project cost listed on all permits related to the work required to convert the unconditioned space to conditioned space and excludes the 10 percent added from this section. Under this section, existing building envelope elements that become a part of the building thermal envelope and are not changed are not required to be upgraded. The additional 10 percent of the project cost shall be appropriated for additional energy conservation features of choice that are addressed in Chapter 11 of the North Carolina Residential Code for one- and two-family dwellings and townhouses or the North Carolina Energy Conservation Code. In addition to the 10-percent project cost, any existing wall, ceiling, or floor cavities that are exposed during construction shall at a minimum be insulated to comply with Chapter 11 of the North Carolina Residential Code for one- and two-family dwellings and townhouses or the North Carolina Energy Conservation Code or be insulated to fill the cavity, whichever is less. Roof systems requiring air space for ventilation shall retain the ventilation space required. Projects costing less than $10,000 are not subject to the 10-percent project cost addition provision.

R504.1 General

AMENDMENT
This section has been amended at the state or city level.
Repair of the building systems shall not make the building less conforming than it was before the repair was undertaken. Work on nondamaged components necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter.

R504.2 Application

AMENDMENT
This section has been amended at the state or city level.

R504.2 Materials

AMENDMENT
This section has been amended at the state or city level.
Portions of walls that are part of the building thermal envelope shall be insulated in accordance with this code when the repair requires the removal of either the interior or exterior wall membrane such that the wall cavity is exposed during the repair.

Exception: Wall cavities containing existing insulation material.

R504.3 Glazing

AMENDMENT
This section has been amended at the state or city level.
Repairs requiring the replacement of individual glass panes or sashes shall not require compliance with this code.

R505.1 General

AMENDMENT
This section has been amended at the state or city level.
New work performed in spaces undergoing a change in occupancy shall comply with the requirements of this code. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.

R505.2 General

AMENDMENT
This section has been amended at the state or city level.
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