California Title 24 building code requires cool roof products on most new and replacement low-slope roofs in climate zones covering Thousand Oaks, reducing heat island effects and cooling costs.
California Title 24 Part 6 mandates cool roof products meeting minimum solar reflectance and thermal emittance values for new construction and reroofs. Thousand Oaks falls in Climate Zone 9 where low-slope roofs require aged solar reflectance of at least 0.63 and thermal emittance of 0.75. Steep-slope residential roofs have lower thresholds but still require qualifying products on additions over 50 percent of roof area. Compliance documentation accompanies building permits. Cool roofs reduce attic temperatures by 30 to 60 degrees and align with Climate Action Plan heat island goals.
Permit applications without compliant roof specifications are rejected. Building inspectors verify product certificates at final inspection before issuing certificate of occupancy.
See how Thousand Oaks's cool roof requirements rules stack up against other locations.
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