I’m a roof inspector and manufactures and FHA recommendations in CA u need 1/300. Maybe a city or district has their own code that is more/less but MOST areas in CA is 1/300. It’s called the FHA 1/300 rule. Ever not know it all? I didn’t say anything about unincorporated areas. http://www.roofhelp.com/ventilation_main.htm
“A common rule of thumb is the 1/300 rule, which means 1 square foot of net free vent area per 300 square feet of attic floor space”.
