• Codes
  • Features
    UpCodes Web UpCodes AI
  • Pricing
  • Sign Up
  • Log in
Log in
Sign Up
  • Code Library
  • Features
  • Pricing
  • About
  • Contact
  • Terms
  • Privacy
// CODE SNIPPET

C402.3 Roof solar reflectance and thermal emittance

Energy Conservation Code 2015 of Utah > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.3 Roof solar reflectance and thermal emittance
JUMP TO FULL CODE CHAPTER

Low-sloped roofs directly above cooled conditioned spaces in Climate Zones 1, 2 and 3 shall comply with one or more of the options in Table C402.3.

Exceptions: The following roofs and portions of roofs are exempt from the requirements of Table C402.3:

  1. Portions of the roof that include or are covered by the following:

    1. 1.1. Photovoltaic systems or components.
    2. 1.2. Solar air or water-heating systems or components.
    3. 1.3. Roof gardens or landscaped roofs.
    4. 1.4. Above-roof decks or walkways.
    5. 1.5. Skylights.
    6. 1.6. HVAC systems and components, and other opaque objects mounted above the roof.
  2. Portions of the roof shaded during the peak sun angle on the summer solstice by permanent features of the building or by permanent features of adjacent buildings.
  3. Portions of roofs that are ballasted with a minimum stone ballast of 17 pounds per square foot [74 kg/m2] or 23 psf [117 kg/m2] pavers.
  4. Roofs where not less than 75 percent of the roof area complies with one or more of the exceptions to this section.

TABLE C402.3

MINIMUM ROOF REFLECTANCE AND EMITTANCE OPTIONSa

Three-year aged solar reflectanceb of 0.55 and 3-year aged thermal emittancec of 0.75
Three-year-aged solar reflectance indexd of 64
  1. The use of area-weighted averages to comply with these requirements shall be permitted. Materials lacking 3-year-aged tested values for either solar reflectance or thermal emittance shall be assigned both a 3-year-aged solar reflectance in accordance with Section C402.3.1 and a 3-year-aged thermal emittance of 0.90.
  2. Aged solar reflectance tested in accordance with ASTM C 1549, ASTM E 903 or ASTM E 1918 or CRRC-1 Standard.
  3. Aged thermal emittance tested in accordance with ASTM C 1371 or ASTM E 408 or CRRC-1 Standard.
  4. Solar reflectance index (SRI) shall be determined in accordance with ASTM E 1980 using a convection coefficient of 2.1 Btu/h • ft2 • °F (12W/m2 • K). Calculation of aged SRI shall be based on aged tested values of solar reflectance and thermal emittance.

C402.3.1 Aged roof solar reflectance

Where an aged solar reflectance required by Section C402.3 is not available, it shall be determined in accordance with Equation 4-3.

(Equation 4-3)

where:

Raged =The aged solar reflectance.
Rinitial =The initial solar reflectance determined in accordance with CRRC-1 Standard.
Share URL

Copy and paste the link below into emails, chats or browsers.

Copy

You can also copy or bookmark the link from your browser's address bar.

Related Code Sections


C402.3 [CE] Commercial Energy Efficiency, Roof solar reflectance and thermal emittance
MINIMUM ROOF REFLECTANCE AND EMITTANCE OPTIONS a Three-year aged solar reflectance b of 0.55 and 3-year aged thermal emittance c of 0.75 Three ...
Energy Conservation Code 2015 of Utah > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.3 Roof solar reflectance and thermal emittance
M2301.2.9 Solar Thermal Energy Systems, Roof and Wall Penetrations
Roof and wall penetrations shall be flashed and sealed in accordance with Chapter 9 of this code to prevent entry of water, rodents and insects ...
Residential Code 2015 of Utah > 23 Solar Thermal Energy Systems > M2301 Thermal Solar Energy Systems > M2301.2 Design and Installation > M2301.2.9 Roof and Wall Penetrations
M2301.2.2 Solar Thermal Energy Systems, Collectors and Panels
The roof shall be constructed to support the loads imposed by roof-mounted solar collectors. Roof-mounted solar ...
Residential Code 2015 of Utah > 23 Solar Thermal Energy Systems > M2301 Thermal Solar Energy Systems > M2301.2 Design and Installation > M2301.2.2 Collectors and Panels
M2301.2.2.1 Solar Thermal Energy Systems, Roof-Mounted Collectors
The roof shall be constructed to support the loads imposed by roof-mounted solar collectors. Roof-mounted solar collectors that serve as a roof ...
Residential Code 2015 of Utah > 23 Solar Thermal Energy Systems > M2301 Thermal Solar Energy Systems > M2301.2 Design and Installation > M2301.2.2 Collectors and Panels > M2301.2.2.1 Roof-Mounted Collectors
Section M2301 Solar Thermal Energy Systems, Thermal Solar Energy Systems
for the design, construction, installation, alteration and repair of equipment and systems using thermal solar energy to provide space heating or cooling ...
Residential Code 2015 of Utah > 23 Solar Thermal Energy Systems > M2301 Thermal Solar Energy Systems
About UpCodes

UpCodes provides an intuitive resource to navigate building regulations.

Codes are organized by jurisdiction to help you understand which regulations apply to your project.


Find Your Codes
COMPANY INFO About Contact Careers Terms Privacy
CATEGORY General New York City New York State California Codes Building Codes Online
PREMIUM Features Pricing Sign Up Log In
CODES IBC 2015 IRC 2015 IPC 2015 California Building Code 2016 Popular Sections

FOLLOW US