Insulation is central to the Title 24 building envelope. In Climate Zone 7, wall, roof, and floor performance is evaluated against an energy budget set for the zone's climate.
Envelope elements Title 24 evaluates
- Wall insulation
- Roof / attic insulation
- Floor insulation
- Air sealing and thermal bridging
Title 24 is a statewide California energy code. Climate Zone 7 does not have its own separate rules — the same statewide standards apply, with the energy budget calibrated to this zone's climate. Your project's exact requirements are determined when your specific address is modeled in CEC-approved compliance software. Upgrading insulation is often the most cost-effective path to compliance when a design falls short on the first model run. The specific R-values that work for your project are determined by modeling your address.
Related: what affects my Title 24 report?