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

https://shanezhxe144.dovetailscope.com/posts/hot-mop-roofs-in-san-diego-a-time-tested-low-slope-option

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.