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Multifamily High Performance Envelope

Measure Description

Quality Insulation Installation (QII)

This measure extends the prescriptive requirements of QII to include high-rise multifamily buildings. QII is currently a prescriptive requirement for multifamily buildings with three or fewer habitable stories in all climate zones except Climate Zone 7. Under the proposed code change, buildings with less than 40,000 ft2 of conditioned floor area would follow the current QII protocol. Buildings equal to or greater than 40,000 ft2 would use a new protocol that is more appropriate and cost effective for large buildings that are built and insulated in stages 

The new protocol would allow for a randomized field verification of a portion of thermal envelope’s insulation installation quality at a specific snapshot in time and would leverage the verification results as representative of the overall quality. This inspection would occur at approximately 30 percent construction completion stage when portions of the building would have both insulation conditions: (1) framed and sealed but with no insulation, (2) insulated but exposed and unfinished. The snapshot protocol includes a minimum of 20 percent total wall area threshold at each complete stage to be covered during field verification(s). 

The proposed protocol includes inspecting for air sealing and insulation installation quality in walls, ceilings/attics, and floors over unconditioned spaces. Curtain wall and spandrel wall construction types common in metal buildings are excluded from the inspection protocol and QII requirements because the high variability of insulating methods and materials, panel-connections, and air-sealing requirements inherent across curtain wall products makes a consistent verification process prohibitively difficult to develop and enforce objectively.  

In the performance approach, the proposed measure uses the same three derating mechanisms as in the 2019 standards for buildings that do not fulfill the prescriptive standard, and a 50 percent partial credit-back formula for each derating mechanism reflective of the partial nature of the proposed snapshot QII protocol. Larger buildings could opt to take extra performance credit for full-inspection QII, and smaller buildings could use the performance approach to trade off against snapshot QII in lieu of the prescriptively mandated full-inspection. The measure applies to new construction buildings and maintains the same trigger condition for additions and alteration at 700 ft2. The proposed code change needs compliance software updates to account for appropriate baseline and proposed/improved conditions.  

Submeasures Moved to Multifamily Chapter Restructuring

Several submeasures that were initially included within this code change proposal have been moved to the Multifamily Chapter Restructuring proposal.

  • Improved Fenestration U-factor and Solar Heat Gain Coefficient
  • Window area limits and metrics (Window to Wall Area Ratio vs Window to Floor Area Ratio)
  • Improved wall assemblies

Submeasures Moved to Future Code Cycles

Reduced thermal bridging


Relevant Documents

Measure proposals, supporting documents, and other outside references will be made public as they become available.

Round Two Utility-Sponsored Stakeholder Meeting Materials

Round One Utility-Sponsored Stakeholder Meeting Materials

Submeasure Summaries

Provide Feedback

Draft CASE Report Now Available (Comments accepted until June 19, 2020)

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email Include the measure name in the subject line.


Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

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