In Artesia, CA, the energy code requires a minimum aged solar reflectance of 0.20 for pitched roofs and 0.63 for low-slope roofs when more than half of the roof is being replaced. This is mandated by the California Energy Commission and the California Building Standards Commission.
Understanding the Energy Code in Artesia
The energy code in California sets specific rules for roof reflectance based on climate zones. Artesia is classified as climate zone 8. This code comes into effect only when more than half of the roof is being replaced, meaning repairs or partial work do not trigger its requirements.
Knowing when the energy code applies is crucial for homeowners. If a full roof replacement is planned, compliance with the energy code's regulations is necessary. For those not replacing more than half the roof, these rules do not apply.
Pitched Roof Requirements
For pitched roofs in Artesia, there is a clear set of prescriptive requirements. The new roofing material must achieve an aged solar reflectance of at least 0.20 and a thermal emittance of at least 0.75, or have a Solar Reflectance Index (SRI) of at least 16. These standards are within reach for most modern roofing products.
This requirement effectively rules out older roofing materials that cannot meet these performance metrics. Homeowners should confirm that their chosen materials comply with these standards before proceeding with installation.
Low-Slope Roof Requirements
Low-slope or flat roof sections face higher requirements under the energy code. An aged solar reflectance of at least 0.63 is mandated, along with a thermal emittance of at least 0.75 or an SRI of at least 75. Many homes in Artesia have flat sections, such as over garages or porches, which must comply with these stricter standards.
Homeowners with flat roofing need to ensure their materials meet these requirements. Not complying can lead to issues with energy efficiency and potential penalties if a full roof replacement is done without adherence to the code.
Exemptions and Alternatives to Compliance
There are alternatives to the steep-slope requirements for homeowners who may find compliance challenging. Options include installing ceiling insulation of R-38 or better, adding an attic radiant barrier, or utilizing continuous insulation above or below the roof deck at R-2 or better.
Additionally, roofs weighing 25 pounds per square foot or more may qualify for exemptions. This is particularly relevant for concrete and clay tile roofs, which are common in the region. It's essential for homeowners to consider these alternatives when planning a roof replacement.