Exterior tapered insulation retrofit for low-sloped roof. 1.2/12 to 4/12 pitch

Have a 1950s house in San Diego (3B climate) with an original 1500 SQFT, 1.2/12 pitch tar&gravel roof (BUR). Its over 2x6in tongue & grove boards (no insulation at all).… Have a 1950s house in San Diego (3B climate) with an original 1500 SQFT, 1.2/12 pitch tar&gravel roof (BUR). Its over 2x6in tongue & grove boards (no insulation at all).…Read MoreGreenBuildingAdvisor