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408.3.1 Roof Coverings—Solar Reflectance and Thermal Emittance
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Where roof coverings are used for compliance with Section 408.3, roof coverings shall comply with Section 408.3.1.1 or 408.3.1.2. The values for solar reflectance and thermal emittance shall be determined by an independent laboratory accredited by a nationally recognized accreditation program. Roof products shall be listed and labeled and certified by the manufacturer demonstrating compliance.
REFLECTANCE AND EMITTANCE
|ROOF SLOPE||MINIMUM AGED |
|MINIMUM AGED |
|2:12 or less||0.55||0.75||60|
|Greater than 2:12||0.30||0.75||25|
Roof products shall be permitted to use a solar reflectance index (SRI) where the calculated value is in compliance with Table 408.3.1 values for minimum aged SRI. The SRI value shall be determined using ASTM E 1980 with a convection coefficient of 2.1 Btu/h-ft2 (12 W/m2 × k) based on three-year aged roof samples tested in accordance with the test methods in Section 408.3.1.1.