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Residential High Performance Attics

Residential Envelope

Codes and Standards Enhancement (CASE) Report

The Statewide CASE Team is requesting feedback on the 2019 Title 24, Part 6 Draft CASE Reports. The CASE Report presents pertinent information that supports the code change proposal. Please email feedback to You may also submit written comments to the Energy Commission. See the agenda for Energy Commission pre-rulemaking workshop (available here) for instructions on how to submit comments to the Energy Commission’s docket.

Draft CASE Report: Residential High Performance Attics

Measure Description

The proposed residential high performance attic (HPA) measure would increase the prescriptive performance of the residential envelope. The HPA measure reduces the heat transfer through the roof deck, improving the performance of space conditioning ducts installed in the attic and reducing ceiling heat transfer to conditioned space. This prescriptive measure would apply to single family and low-rise multifamily buildings including new construction, as well as additions exceeding the 700 ft2 minimum size threshold (consistent with the current threshold specified under 2016 Title 24, Part 6). Relative to the 2016 Title 24, Part 6, the proposed measure increases prescriptive insulation requirements in Climate Zones 4, and 8 through 16 for single family homes, and zones 4, 8, 9, and 11 through 15 for low-rise multifamily buildings. This code change would modify existing code language and would not create any new sections of code.

Request for Feedback

The Statewide Utility Team encourages participation in the CASE Report development process through the submission of data—both primary sources and references to existing data. We are requesting data on areas such as energy savings, costs, market impacts, industry practices, barriers to code compliance, etc. from stakeholders. The data will inform the energy savings estimates, cost-effectiveness analysis, compliance and enforcement, and market impacts that will be presented in CASE Reports.

Do you have feedback or data to share? Send us an email at

California Statewide Utility Codes and Standards Program

This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.