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 Los Angeles County
 Code of Ordinances
 Title 31. GREEN BUILDING STANDARDS CODE
 Chapter 1. ADMINISTRATION

  Appendix 301. GENERAL.  

Latest version.

  • 301.1   Scope.

    Buildings and structures shall be designed to include the green building measures indicated in Sections 301.1.1, 301.2, and 301.3.

    (Ord. 2016-0058 § 4, 2016.)

    301.1.1   Residential construction.

    [HCD]

    The mandatory provisions of Chapter 4 shall be applied to newly constructed low-rise and high-rise residential buildings and structures six stories or less and additions or alterations of existing residential buildings. The requirements shall apply only to and/or within the specified area of the addition or alteration.

    Newly constructed high-rise residential buildings of seven stories or greater shall comply with Section 301.3.

    …

    (Ord. 2016-0058 § 4, 2016.)

    301.3   Nonresidential construction.

    [BSC - CG]

    …

    (Ord. 2016-0058 § 4, 2016.)

    301.3.3   Nonresidential buildings greater than or equal to 25,000 square feet.

    In addition to the requirements of Section 301.3, any newly constructed nonresidential building greater than or equal to 25,000 square feet shall comply with all requirements of Section A5.601.2.4 Tier 1. Roofing materials shall comply with Tier 2 requirements of Table A5.106.11.2.3.[BSC].

    Exceptions:

    1.

    Compliance with Section A5.601.2.3 shall be voluntary.

    2.

    High-rise residential buildings of seven stories or greater shall comply with Table A4.106.5.1(4) in lieu of Table A5.106.11.2.3.

    (Ord. 2018-0039 § 2, 2018: Ord. 2016-0058 § 4, 2016.)

    4.106.5   Low-impact development (LID).

    New development or alterations to existing developed sites shall comply with Chapter 12.84 of Title 12 of the Los Angeles County Code.

    (Ord. 2016-0058 § 5, 2016.)

    4.106.6   Cool roof for reduction of heat island effect.

    Roofing materials shall comply with the solar reflectance and thermal emittance requirements of this section.

    Exceptions:

    1.

    Roof repair.

    2.

    Roof replacement when the roof area being replaced is equal to or less than 50 percent of the total roof area.

    3.

    Installation of building-integrated photovoltaics.

    4.

    Installation of a steep-sloped roof (roof slope > 2:12) in climate zone 16 on other than a low-rise multifamily building.

    5.

    Additions resulting in less than 500 square feet of added roof area or less than 50 percent of the total roof area, whichever is greater.

    6.

    Roof construction that has a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.

    (Ord. 2018-0039 § 3, 2018.)

    4.106.6.1   Solar reflectance.

    Roofing materials shall have a minimum 3-year aged solar reflectance equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2).

    Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A4.106.5.1, if the CRRC testing for aged solar reflectance is not available.

    (Ord. 2018-0039 § 3, 2018.)

    4.106.6.2   Thermal emittance.

    Roofing materials shall have a CRRC initial or aged thermal emittance equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2).

    (Ord. 2018-0039 § 3, 2018.)

    4.106.6.3   Solar reflectance index alternative.

    Roofing materials having a Solar Reflectance Index (SRI) equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2) may be used as an alternative to compliance with the 3-year aged solar reflectance and thermal emittance values.

    SRI values used to comply with this section shall be calculated using the SRI Calculation Worksheet (SRI-WS) developed by the California Energy Commission or in compliance with ASTM E1980-01, as specified in the current California Energy Code. Solar reflectance values used in the SRI-WS shall be based on the aged reflectance value of the roofing product or the equation in Section A4.106.5.1, if the CRRC certified aged solar reflectance is not available. Certified thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.

    (Ord. 2018-0039 § 3, 2018.)

    TABLE 4.106.6(1) - LOW-RISE RESIDENTIAL

    ROOF SLOPE MINIMUM 3-YEAR AGED SOLAR
    REFLECTANCE     		THERMAL
    EMITTANCE     		SRI
    ≤2:12 0.65 0.85 78
    >2:12 0.25 0.85 20

     

    (Ord. 2018-0039 § 4, 2018.)

    TABLE 4.106.6(2) - HIGH RISE RESIDENTIAL BUILDINGS, HOTELS AND MOTELS

    ROOF SLOPE MINIMUM 3-YEAR AGED SOLAR
    REFLECTANCE     		THERMAL
    EMITTANCE     		SRI
    ≤2:12 0.65 0.75 78
    >2:12 0.25 0.75 20

     

    (Ord. 2018-0039 § 4, 2018.)

    4.408   Construction Waste Reduction, Disposal and Recycling

    4.408.1   Construction waste management.

    Newly-constructed projects and additions and alterations to existing buildings shall recycle and/or salvage for reuse a minimum of 65 percent of the non-hazardous construction and demolition debris, or meet a local construction and demolition waste management ordinance, whichever is more stringent. Calculate the amount of materials diverted by weight or by volume, but not by both.

    (Ord. 2016-0058 § 6, 2016.)

    4.408.2   Deleted.

    (Ord. 2016-0058 § 6, 2016.)

    4.408.3   Deleted.

    (Ord. 2016-0058 § 6, 2016.)

    4.408.4   Deleted.

    (Ord. 2016-0058 § 6, 2016.)

    4.408.4.1   Deleted.

    (Ord. 2016-0058 § 6, 2016.)

    4.408.5   Deleted.

    (Ord. 2016-0058 § 6, 2016.)

    5.106.2   Low-impact development (LID).

    New development or alterations to existing developed sites shall comply with Chapter 12.84 of Title 12 of the Los Angeles County Code.

    (Ord. 2016-0058 § 7, 2016.)

    5.106.3   Reserved.

    (Ord. 2016-0058 § 8, 2016.)

    5.106.11   Cool roof for reduction of heat island effect.

    Roofing materials shall comply with the solar reflectance and thermal emittance requirements of this section.

    Exceptions:

    1.

    Roof repair.

    2.

    Roof replacement when the roof area being replaced is equal to or less than 50 percent of the total roof area.

    3.

    Installation of building-integrated photovoltaics.

    4.

    Additions resulting in less than 500 square feet of added roof area or less than 50 percent of the total roof area, whichever is greater.

    5.

    Roof construction that has a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.

    (Ord. 2018-0039 § 5, 2018.)

    5.106.11.1   Solar reflectance.

    Roofing materials shall have a minimum 3-year aged solar reflectance equal to or greater than values specified in Table 5.106.11.

    Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRC testing for aged solar reflectance is not available.

    (Ord. 2018-0039 § 5, 2018.)

    5.106.11.2   Thermal emittance.

    Roofing material shall have a CRRC initial or aged thermal emittance equal to or greater than the values specified in Table 5.106.11.

    (Ord. 2018-0039 § 5, 2018.)

    5.106.11.3   Solar reflectance index alternative.

    Roofing material having an SRI equal to or greater than the values specified in Table 5.106.11 may be used as an alternative to compliance with the 3-year aged solar reflectance and thermal emittance values.

    SRI values used to comply with this section shall be calculated using the SRI-WS developed by the California Energy Commission or in compliance with ASTM E1980-01, as specified in the current California Energy Code. Solar reflectance values used in the SRI-WS shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRC certified aged solar reflectance is not available. Certified thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.

    (Ord. 2018-0039 § 5, 2018.)

    TABLE 5.106.11

    ROOF SLOPE MINIMUM 3-YEAR AGED SOLAR
    REFLECTANCE     		THERMAL
    EMITTANCE     		SRI
    ≤2:12 0.68 0.85 82
    >2:12 0.28 0.85 27

     

    (Ord. 2018-0039 § 6, 2018.)

    5.408   Construction Waste Reduction, Disposal and Recycling

    5.408.1   Construction waste management.

    Newly-constructed projects and additions and alterations to existing buildings shall recycle and/or salvage for reuse a minimum of 65 percent of the non-hazardous construction and demolition debris, or meet a local construction and demolition waste management ordinance, whichever is more stringent. Calculate the amount of materials diverted by weight or volume, but not by both.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.1.1   Deleted.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.1.2   Deleted.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.1.3   Deleted.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.1.4   Deleted.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.2   Deleted.

    (Ord. 2016-0058 § 9, 2016.)

    5.408.3   Deleted.

(Ord. 2016-0058 § 9, 2016.)