California’s Title 24 energy standards address the energy efficiency of new construction of, and additions and alterations to, homes and commercial buildings. Since buildings are one of the major contributors to electricity demand, the goal of Title 24 is to reduce energy consumption in California for its energy future.
The Title 24 Roofing Code establishes new requirements to promote the installation of “Cool Roofs” in Low Rise Residential Steep Slope Construction. Cool Roofs are roofs consisting of materials with extraordinarily high reflectance of the sun’s energy from the roof surface, as well as have high emissivity, allowing them to emit infrared energy. Thus, significantly reducing energy costs and urban heat islands.
Eagle Roofing Products is committed to helping our partners adhere to the California Energy Commission’s energy standards by providing our Customers with Cool Roof concrete tile solutions that not only meet the new requirements, but deliver the beauty, durability and value that you’ve come to expect.
How does Title 24 Impact You?
- Builders: All new permits and buildings must comply
- Architects: Must plan for the new energy efficiency requirements
- Roofers: Can differentiate by knowing the new code
Cool Roof Criteria
California is divided into 16 climate zones. Buildings located in Climate Zones 10 -15 need to meet the following Solar Reflectance (SR), Thermal Emittance (TE) and Solar Reflectance Index (SRI) requirements as outlined by the California Energy Commission (CEC).
- Solar Reflectance (SR): Measure of a surface’s ability to reflect solar energy.
- Dark surfaces tend to absorb solar energy, becoming hot and passing heat into the attic below. Lighter surfaces reflect solar energy and help keep the roof and building cooler.
- Solar Reflectance is expressed as a percentage (0-100%) as listed by the CRRC.
- Aged Solar Reflectance tests the surface after three years and is typically lower than initial solar reflectance.
- The new Title 24 requirement for aged SR is .20 or 20%.
- Thermal Emittance (TE): The ability of a roofing material to release absorbed heat energy back into the atmosphere.
- Surfaces with low emittance transfer more heat into the roof components and attic space.
- Thermal Emittance is expressed as a percentage (0-100%) as listed by the CRRC.
- The new Title 24 requirement for TE is .75 or 75%.
Solar Reflectance Index
- Solar Reflectance Index (SRI): Index that uses a calculation, incorporating both SR and TEas listed by the CRRC.
- A color is assigned a value between 0 and 100.
- The California Energy Commission is concerned with aged SRI.
- The aged SRI calculation is made using a 3 year aged reflectance, as listed with the CRRC.
- The CRRC has a calculator for new colors to determine an estimated aged SRI.
- The new Title 24 requirement for Estimated Aged SRI is 16.
New Construction Eagle Products Available
Re-Roof and Alterations Eagle Products Available
Climate Zones 10-15
- Any tile color that has an aged SRI of 16 or more.
- Any color of Capistrano.
- Any tile installed on elevated battens that provide 1” between the bottom of the tile and the roof deck.
Requirements vary by zone, depending on the building and the climate method. Any municipality, even outside of climate zones 10-15, can choose to enforce these Title 24 changes. Any municipality in all climate zones can choose more strict regulations, such as Cal Green. It is important that contractors know the requirements in the municipalities where they re-roof.
To see which climate zone your project is in and the requirements associated with your building structure, visit the CEC’s website: http://www.energy.ca.gov/maps/renewable/building_climate_zones.html