• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

A5.106.11 Heat Island Effect

Los Angeles Green Building Code > A5 Nonresidential Voluntary Measures > A5.106 Site Development > A5.106.11 Heat Island Effect
JUMP TO FULL CODE CHAPTER
Reduce nonroof heat islands by Section A5.106.11.1 and roof heat islands by Section A5.106.11.2.

A5.106.11.1 Hardscape Alternatives

Use one or a combination of strategies 1 and 2 for 50 percent of site hardscape or put 50 percent of parking underground.

  1. Use light colored materials with an initial solar reflectance value of at least 30 as determined in accordance with American Society for Testing and Materials (ASTM) Standards E1918 or C1549.
  2. Use open-grid pavement system or pervious or permeable pavement system.

A5.106.11.2 Cool Roof for Reduction of Heat Island Effect

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

Use roofing materials having a minimum aged solar reflectance and thermal emittance complying with Sections A5.106.11.2.1 and A5.106.11.2.2 or a minimum aged Solar Reflectance Index (SRI) complying with Section A5.106.11.2.3 and as shown in Table A5.106.11.2.2 for Tier 1 or Table A5.106.11.2.3 for Tier 2.

Exceptions:

  1. Roof constructions that have a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.
  2. Roof area covered by building integrated solar photovoltaic and building integrated solar thermal panels.

A5.106.11.2 Cool Roof for Reduction of Heat Island Effect

AMENDMENT
This section has been amended at the state or city level.
Use roofing materials having a minimum aged solar reflectance and thermal emittance complying with CALGreen Sections A5.106.11.2.1 and A5.106.11.2.2 or a minimum aged Solar Reflectance Index (SRI) complying with CALGreen Section A5.106.11.2.3 and as shown in LAMC Table A5.106.11.2.2 for Tier 1 or LAMC Table A5.106.11.2.3 for Tier 2.
EXCEPTIONS:
  1. Roof constructions that have thermal mass over the roof membrane, including areas of vegetative (green) roofs, weighing at least 25 pounds per square foot.
  2. Roof area covered by building integrated solar photovoltaic and building integrated solar thermal panels.

A5.106.11.2.1 Solar Reflectance

Roofing materials shall have a minimum aged solar reflectance equal to or greater than the values specified in Table A5.106.11.2.2 for Tier 1 and Table A5.106.11.2.3 for Tier 2.

If Cool Roof Rating Council (CRRC) testing for aged reflectance is not available for any roofing products, the aged value shall be determined using the CRRC certified initial value using the equation ρaged = [0.2 + β [ρinitial — 0.2], where ρinitial = the initial solar reflectance and soiling resistance, β, listed by product type in Table A5.106.11.2.1.

Solar reflectance may also be certified by other supervisory entities approved by the Energy Commission pursuant to Title 24, Part 1, California Administrative Code.

TABLE A5.106.11.2.1

VALUES OF SOILING RESISTANCE, β, BY PRODUCT TYPE

PRODUCT TYPECRRC PRODUCT CATEGORYβ
Field-applied coatingField-applied coating0.65
OtherNot a field-applied coating0.70

A5.106.11.2.2 Thermal Emittance

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

Roofing materials shall have a CRRC initial or aged thermal emittance as determined in accordance with ASTM E408 or C1371 equal to or greater than those specified in Table A5.106.11.2.2 for Tier 1 and Table A5.106.11.2.3 for Tier 2.

Thermal emittance may also be certified by other supervisory entities approved by the Energy Commission pursuant to Title 24, Part 1, California Administrative Code.

TABLE A5.106.11.2.2

[BSC] TIER 1

ROOF SLOPECLIMATE ZONEMINIMUM AGED SOLAR REFLECTANCETHERMAL EMITTANCESRI
≤ 2:121—160.630.7575
> 2:121—160.200.7516
TABLE A5.106.11.2.2 [BSC]
TIER 1
ROOF SLOPE MINIMUM 3-YEAR AGED SOLAR REFLECTANCE THERMAL EMITTANCE 3-YEAR AGED SRI
≤ 2 : 12 0.68 0.85 82
> 2 : 12 0.28 0.85 27

A5.106.11.2.3 Solar Reflectance Index Alternative

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

Solar Reflectance Index (SRI) equal to or greater than the values specified in Table A5.106.11.2.2 for Tier 1 and Table A5.106.11.2.3 for Tier 2 may be used as an alternative to compliance with the aged solar reflectance values and thermal emittance.

SRI values used to comply with this section shall be calculated using the Solar Reflectance Index (SRI) Calculation Worksheet (SRI-WS) developed by the California Energy Commission or in compliance with ASTM E1980-01 as specified in the California Energy Code, Section 118(i)3. 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 are not available. Certified Thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.

Solar reflectance and thermal emittance may also be certified by other supervisory entities approved by the Commission pursuant to Title 24, Part 1, California Administrative Code.

Note: The Solar Reflectance Index Calculation Worksheet (SRI-WS) is available by contacting the Energy Standard Hotline at 1-800-772-3300, website at www.energy.ca.gov or by email at Title24@energy.state.ca.us.

TABLE A5.106.11.2.3

[BSC] TIER 2

ROOF SLOPECLIMATE ZONEMINIMUM AGED SOLAR REFLECTANCETHERMAL EMITTANCESRI
≤ 2:121—160.680.8582
> 2:121—160.280.8527
TABLE A5.106.11.2.3
TIER 2
ROOF SLOPE MINIMUM 3-YEAR AGED SOLAR REFLECTANCE THERMAL EMITTANCE 3-YEAR AGED SRI
≤ 2 : 12 0.70 0.85 85
> 2 : 12 0.34 0.85 35

A5.106.11.3 Verification of Compliance

If no documentation is available, an inspection shall be conducted to ensure roofing materials meet cool roof aged solar reflectance and thermal emittance or SRI values.

CALIFORNIA GREEN BUILDING STANDARDS CODE — MATRIX ADOPTION TABLE

APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES
DIVISION A5.2 — ENERGY EFFICIENCY

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the user.

See Chapter 1 for state agency authority and building applications.)
Adopting agencyBSCBSC-CGSFMHCDDSAOSHPDBSCCDPHAGRDWRCECCASLSLC
121/ACACSS1234
Adopt entire CA chapter
Adopt entire chapter as amended (amended sections listed below)
Adopt only those sections that are listed belowX
Chapter/Section
A5.201.1X
A5.202.1 DefinitionsX
A5.203.1X
A5.203.1.1X
A5.203.1.1.1X
A5.203.1.1.2X
A5.203.1.1.3X
A5.203.1.2X
A5.203.1.2.1X
A5.203.1.2.2X
A5.211.1X
A5.211.1.1X
A5.211.3X
A5.212.1X
A5.212.1.1 and subsectionX
A5.212.1.2X
A5.212.1.4X
A5.213X

Related Code Sections


A5.106.11 Nonresidential Voluntary Measures, Heat Island Effect
Reduce nonroof heat islands by Section A5.106.11.1 and roof heat islands by Section A5.106.11.2 ...
Los Angeles Green Building Code > A5 Nonresidential Voluntary Measures > A5.106 Site Development > A5.106.11 Heat Island Effect
A5.106.11 Nonresidential Voluntary Measures, Heat Island Effect
Reduce nonroof heat islands by Section A5.106.11.1 and roof heat islands by Section A5.106.11.2 ...
Los Angeles Green Building Code > A5 Nonresidential Voluntary Measures > A5.106 Site Development > A5.106.11 Heat Island Effect
A4.106.5 Residential Voluntary Measures, Cool Roof for Reduction of Heat Island Effect
Roofing materials for Tier 1 and Tier 2 buildings shall comply with this section: Exceptions: Roof constructions that have a thermal mass over ...
Los Angeles Green Building Code > A4 Residential Voluntary Measures > A4.106 Site Development > A4.106.5 Cool Roof for Reduction of Heat Island Effect
A4.106.5 Residential Voluntary Measures, Cool Roof for Reduction of Heat Island Effect
Roofing materials for Tier 1 and Tier 2 buildings shall comply with this section: Exceptions: Roof constructions that have a thermal mass over ...
Los Angeles Green Building Code > A4 Residential Voluntary Measures > A4.106 Site Development > A4.106.5 Cool Roof for Reduction of Heat Island Effect
Help Contact Us Privacy Terms
Code Compare
Code Compare
Highlight differences between any two building codes.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
Access to UL product and system certification information.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
Join the waitlist
We are looking to gauge the level of interest in linking UL product and system certification information alongside related code sections.

Let us know your email and we’ll ping you once it’s ready! Learn more.

Thank you for your interest!

If you’re open to it, we would love to jump on the phone to make sure we’re building this in the best way possible for your workflow. Any insight or advice would be greatly appreciated. We’ve sent you an email with a calendar link to book at time with us.


Cancel
Get Early Access
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE