Torch-down roofs in San Diego are used on low-slope areas

https://augusthmin584.alderbrief.com/posts/torch-down-roofs-in-san-diego-modified-bitumen-for-low-slope-roofing-2

Torch-down roofs in San Diego are used on low-slope areas, where reroofing rules allow exceptions to typical slope limits when the roof still provides positive drainage.