For a single-family re-roof in CEC Climate Zone 9, the Title 24 Part 6 prescriptive cool-roof values are an aged solar reflectance of at least 0.20 with thermal emittance of at least 0.75, or an SRI of at least 16, on steep slopes of 2:12 or more, and at least 0.63 with emittance of at least 0.75, or an SRI of at least 75, on low slopes under 2:12. That requirement is triggered when more than 50 percent of the roof area is replaced, which is a different threshold from the City permit trigger, and the parcel's zone should be checked with the CEC zone finder before a product is specified.
Simi Valley contains High and Very High Fire Hazard Severity Zone parcels, but it is not correct to say that all of Simi Valley is Very High. The parcel's zone must be checked in the CAL FIRE / VCFD Fire Hazard Severity Zone viewer, and on a wildland-urban interface parcel the current citation is Title 24 Part 7, the California Wildland-Urban Interface Code, not the retired CBC Chapter 7A. On such a parcel a Class A fire-rated roof assembly is required.
Stop the water first, then fix the roof correctly.