Central Valley roofing deals primarily with extreme heat (Fresno and Bakersfield regularly exceed 100°F for months), occasional wildfire smoke events, and atmospheric river flooding in the wet seasons. Title 24 cool roof requirements are critically important here — a white or light-colored roof can reduce attic temperatures by 30°F+ in valley summers, materially reducing AC costs. Wildfire risk is present in foothill communities adjacent to the Sierra Nevada and Coast Ranges. C-39 license required throughout the region.