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Residential High Performance Walls

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.

Measure Description

The proposed residential high performance walls measure increases the prescriptive performance of the residential envelope in certain climates, reducing the amount of heat transfer through walls and subsequently reducing heating, ventilation, and air conditioning (HVAC) loads. This prescriptive measure applies to single family buildings, both new construction and additions. Specifically, the proposed measure reduces the prescriptive wall U-factor from 0.051 to 0.043 in Climate Zones 1 and 11 through 16. While the proposed measure was also found to be cost effective for low-rise multifamily buildings in Climate Zones 11, 15 and 16, because of unique challenges experienced in multifamily construction this building type has been excluded from the proposal. This prescriptive measure does not apply to alterations.

Under the 2016 Title 24, Part 6 code cycle, high performance walls were introduced as a residential prescriptive requirement. The work for the 2019 Title 24, Part 6 code cycle expands on that conducted for the previous code cycle as well as the market transformation activities that are currently underway to help transition California builders toward high performance walls.