ADOPTS WITH AMENDMENTS:

International Building Code 2015 (IBC 2015)

Heads up: There are no amended sections in this chapter.
This chapter governs the design and construction of buildings for energy efficiency.
Buildings shall be designed and constructed in accordance with the International Energy Conservation Code.

1301.1.1.1 Changes to the IECC

AMENDMENT
This section has been amended at the state or city level.
The following changes shall be made to the IECC:
  1. Change Table C402.4 to read:
    TABLE C402.4
    BUILDING ENVELOPE REQUIREMENTS: FENESTRATION
    CLIMATE ZONE 1 2 3 4 EXCEPT
    MARINE
    5 AND
    MARINE 4
    6 7 8
    Vertical fenestration

    U-factor

    Fixed fenestration

    0.50 0.50 0.46 0.38 0.38 0.36 0.29 0.29

    Operable fenestration

    0.65 0.65 0.60 0.45 0.45 0.43 0.37 0.37

    Entrance doors

    1.10 0.83 0.77 0.77 0.77 0.77 0.77 0.77

    SHGC

    SHGC

    0.25 0.25 0.25 0.40 0.40 0.40 0.45 0.45

    Skylights

    U-factor

    0.75 0.65 0.55 0.50 0.50 0.50 0.50 0.50

    SHGC

    0.35 0.35 0.35 0.40 0.40 0.40 NR NR

    NR = No requirement.
  2. Change Section C402.4.3 to read:
    1. C402.4.3 Maximum U-factor and SHGC. The maximum U-factor and solar heat gain coefficient (SHGC) for fenestration shall be as specified in Table C402.4.

      The window projection factor shall be determined in accordance with Equation 4-5.

      (Equation 4-5)
      where:

      PF = Projection factor (decimal).

      A = Distance measured horizontally from the furthest continuous extremity of any overhang, eave or permanently attached shading device to the vertical surface of the glazing.

      B = Distance measured vertically from the bottom of the glazing to the underside of the overhang, eave or permanently attached shading device.

      Where different windows or glass doors have different PF values, they shall each be evaluated separately.

      Where the fenestration projection factor for a specific vertical fenestration product is greater than or equal to 0.20, the required maximum SHGC from Table C402.4 shall be adjusted by multiplying the required maximum SHGC by the multiplier specified in Table C402.4.3 corresponding with the orientation of the fenestration product and the projection factor.
  3. Add Table C402.4.3 to read:
    TABLE C402.4.3
    SHGC ADJUSTMENT MULTIPLIERS
    PROJECTION
    FACTOR
    ORIENTED WITHIN45 DEGREESOF TRUE NORTH ALL OTHERORIENTATIONS
    0.2 ≤ PF < 0.5 1.1 1.2
    PF ≤0.5 1.2 1.6
  4. Add an exception to the first paragraph of Section C403.2.4.3 to read:
    Exception: Any grease duct serving a Type I hood installed in accordance with Section 506.3 of the International Mechanical Code shall not be required to have a motorized or gravity damper.
  5. Add Section C403.2.6.3 to read:
    1. C403.2.6.3 Dwelling unit mechanical ventilation. Mechanical ventilation shall be provided for dwelling units in accordance with the International Mechanical Code.
  6. Change Section C405.5 to read:
    1. C405.5 Exterior lighting (Mandatory). All exterior lighting, other than low-voltage landscape lighting, shall comply with Section C405.5.1.
      Exception: Where approved because of historical, safety, signage, or emergency considerations.
  7. Change Section R401.2 to read:
    1. R401.2 Compliance. Projects shall comply with all provisions of Chapter 4 labeled "Mandatory" and one of the following:
      1. Sections R401 through R404.
      2. Section R405.
      3. Section R406.
      4. The most recent version of REScheck, keyed to the 2015 International Energy Conservation Code.
      Note: See REScheck compliance guidance issued by DHCD, available at the Department's website.
  8. Delete Section R401.3.
  9. Change the ceiling R-value and wood frame wall R-value categories for Climate Zone "4 exception Marine" in Table R402.1.2 to read:

    CEILING R-VALUE WOOD FRAMEWALL R-VALUE
    38 15 or 13+1h
  10. Change the ceiling U-factor and frame wall U-factor categories for Climate Zone "4 except Marine" in Table R402.1.4 to read:

    CEILING U-VALUE FRAME WALL U-VALUE
    0.030 0.079
  11. Change Section R402.2.4 to read:
    1. R402.2.4 Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weatherstripped and insulated in accordance with the following values:
      1. Hinged vertical doors shall have a minimum overall R-5 insulation value;
      2. Hatches and scuttle hole covers shall be insulated to a level equivalent to the insulation on the surrounding surfaces; and
      3. Pull down stairs shall have a minimum of 75 percent of the panel area having R-5 rigid insulation.
      Access shall be provided to all equipment that prevents damaging or compressing the insulation. A wood framed or equivalent baffle or retainer is required to be provided when loose fill insulation is installed, the purpose of which is to prevent the loose fill insulation from spilling into the living space when the attic access is opened and to provide a permanent means of maintaining the installed R-value of the loose fill insulation.
  12. Change Sections R402.4 and R402.4.1.1 to read:
    1. R402.4 Air leakage. 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.
      1. R402.4.1.1 Installation (Mandatory). The components of the building thermal envelope as listed in Table R402.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria listed in Table R402.4.1.1, as applicable to the method of construction. Where required by the code official, an approved third party shall inspect all components and verify compliance.
  13. Change the title of the "Insulation Installation Criteria" category of Table R402.4.1.1; change the "Shower/tub on exterior wall" category of Table R402.4.1.1, and add footnotes "b" and "c" to Table R402.4.1.1 to read:

    COMPONENT

    AIR BARRIER CRITERIA

    INSULATION
    INSTALLATION
    CRITERIAb

    Shower/tub on exterior wallc The air barrier installed at exterior wall adjacent to showers and tubs shall be installed on the interior side and separate the exterior walls from the showers ortubs. Exterior walls adjacent to showers and tubs shall be insulated.
    1. b. Structural integrity of headers shall be in accordance with the applicable building code.
    2. c. Air barriers used behind showers and tubs on exterior walls shall be of a permeable material that does not cause the entrapment of moisture in the stud cavity.
  14. Change Section R402.4.1.2 and add Sections R402.4.1.2.1, R402.4.1.2.2, and R402.4.1.3 to read:
    1. R402.4.1.2 Air sealing. Building envelope air tightness shall be demonstrated to comply with either Section R402.4.1.2.1 or R402.4.1.2.2.
      1. R402.4.1.2.1 Testing option. The building or dwelling unit shall be tested for air leakage. Testing shall be conducted with a blower door at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the building official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the building official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope.

        During testing:
        1. Exterior windows and doors and fireplace and stove doors shall be closed, but not sealed beyond the intended weatherstripping or other infiltration control measures;
        2. Dampers, including exhaust, intake, makeup air, backdraft and flue dampers, shall be closed, but not sealed beyond intended infiltration control measures;
        3. Interior doors, if installed at the time of the test, shall be open;
        4. Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed;
        5. Heating and cooling systems, if installed at the time of the test, shall be turned off; and
        6. Supply and return registers, if installed at the time of the test, shall be fully open.
      2. R402.4.1.2.2 Visual inspection option. Building envelope tightness shall be considered acceptable when the items listed in Table R402.4.1.1, applicable to the method of construction, are field verified. Where required by the building official, an approved party, independent from the installer, shall inspect the air barrier.
    2. R402.4.1.3 Leakage rate (Prescriptive). The building or dwelling unit shall have an air leakage rate not exceeding 5 changes per hour as verified in accordance with Section R402.4.1.2.
  15. Change Section R403.3.3 to read:
    1. R403.3.3 Duct testing (Mandatory). Ducts shall be pressure tested to determine air leakage by one of the following methods:
      1. Rough-in test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure if installed at the time of the test. All registers shall be taped or otherwise sealed during the test.
      2. Postconstruction test: Total leakage shall be measured with a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. Registers shall be taped or otherwise sealed during the test.
        Exception: A duct air leakage test shall not be required where the ducts and air handlers are located entirely within the building thermal envelope.
      A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. The licensed mechanical contractor installing the mechanical system shall be permitted to perform the duct testing. The contractor shall have been trained on the equipment used to perform the test.
  16. Change Section R403.7 to read:
    1. R403.7 Equipment and appliance sizing. Heating and cooling equipment and appliances shall be sized in accordance with ACCA Manual S or other approved sizing methodologies based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies.
      Exception: Heating and cooling equipment and appliance sizing shall not be limited to the capacities determined in accordance with Manual S or other approved sizing methodologies where any of the following conditions apply:
      1. The specified equipment or appliance utilizes multistage technology or variable refrigerant flow technology and the loads calculated in accordance with the approved heating and cooling methodology fall within the range of the manufacturer's published capacities for that equipment or appliance.
      2. The specified equipment or appliance manufacturer's published capacities cannot satisfy both the total and sensible heat gains calculated in accordance with the approved heating and cooling methodology and the next larger standard size unit is specified.
      3. The specified equipment or appliance is the lowest capacity unit available from the specified manufacturer.
  17. Change Table R406.4 to read:
    TABLE R406.4
    MAXIMUM ENERGY RATING INDEXa
    CLIMATE ZONE ENERGY RATING INDEX
    1 52
    2 52
    3 51
    4 62
    5 55
    6 54
    7 53
    8 53
    1. When on-site renewable energy is included for compliance using the ERI analysis per Section R406.4, the building shall meet the mandatory requirements of Section R406.2 and the building thermal envelope shall be greater than or equal to levels of energy efficiency and solar heat gain coefficient in Table R402.1.2, with a ceiling R-value of 49 and a wood frame wall R-value of 20 or 13+5, or Table R402.1.4, with a ceiling U-factor of 0.026 and a frame wall U-factor of 0.060.
  18. Delete Section R503.1.1.1.
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