The California Energy Code, or Title 24, Part 6 of the California Code of Regulations, also titled The Energy Efficiency Standards for Residential and Nonresidential Buildings were established in 1978 in response to a legislative mandate to reduce California’s energy consumption. As of January 1, 2010, these standards have been updated. The new standards affect new construction, significant repairs of existing roofs, re-roofing (steep-slope), plus additions and alterations of existing buildings and homes.
Cool roofs are unique shingles that slow heat build-up to make your home more energy efficient. There are two radiative properties to measure the “coolness” of the roof; Solar Reflectance and Thermal emittance. Solar Reflectance is the ability to reflect incoming solar energy back into the sky and Thermal Emittance is the amount of absorbed heat that is radiated from a roof. The higher the rating on both of these properties, the cooler the roof. Potentially, a key component for beating the Sacramento summer heat.
Currently, a residential cool roof is an optional energy efficiency measure, however on January 1, 2010, a cool roof is required for residential buildings (Climate Zones-10-15, Sacramento is Zone 12). Cool roof standards are designed to reduce air conditioner demand, lower your energy costs, and reduce the urban heat island effect.
If you choose not to install a Cool Roof, there are other options available that do meet the new Title 24, Part 6 Energy Efficiency Standards: