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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.
TABLE 408.3.1
REFLECTANCE AND EMITTANCE
| ROOF SLOPE | MINIMUM AGED SOLAR REFLECTANCE | MINIMUM AGED THERMAL EMITTANCE | MINIMUM AGED SRI |
| 2:12 or less | 0.55 | 0.75 | 60 |
| Greater than 2:12 | 0.30 | 0.75 | 25 |
Roof products shall be tested for a minimum three-year aged solar reflectance in accordance with ASTM E 1918, ASTM C 1549 or the CRRC-1 Standard and thermal emittance in accordance with ASTM C 1371, ASTM E 408 or the CRRC-1 Standard, and shall comply with the minimum values in Table 408.3.1.
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.