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Mandatory Measures

Title 24 contains mandatory measures which must be designed and built into all new homes in California without exception or trade-off. In addition to the mandatory measures, the Standards provide two basic methods for complying with low-rise residential energy budgets: the prescriptive approach and the performance approach. The mandatory measures must be installed with either of these approaches. Mandatory measures may be superseded by more stringent measures under the prescriptive or performance approaches. In the prescriptive packages, efficiency levels for envelope elements, water heating and HVAC are given for each climate zone, and these criteria may not be changed. Using the performance approach alternative, higher efficiency in some of these elements can be traded off for lower efficiency in others.


Video of Mandatory Measures

Mandatory Measures

Mandatory Measures were established to set minimum requirements for energy efficiency performance for all residential buildings in California. Mandatory Measures govern efficiency requirements, which apply to envelope insulation values, lighting, space and water heating systems, ducts, and others. As Chris Olvera from the California Energy Commission clarifies, Mandatory Measures are required features, regardless whether the prescriptive or performance method were used to demonstrate compliance. The MF-1R form has changed for the 2008 Energy Efficiency Standards, and now serves as a summary of the Mandatory Measures that should be included on the plans. In addition, there are several new Mandatory Measures under the 2008 Standards.

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Video of Energy Budget vs. Mandatory Measures

Energy Budget vs. Mandatory Measures

Buildings must meet minimal efficiency requirements in order to comply with Title 24 Building Energy Efficiency Standards. The Energy Efficiency Standards contain Mandatory Measures, which are common-sense guidelines required across the state, regardless of the type of project. Mandatory Measures must always be cost effective, and are required, regardless of the compliance approach taken. However, as Rob Hudler from the California Energy Commission explains, when the Performance approach is taken, the building must also meet an energy budget, which simulates a building’s energy use for a full year. When a proposed building design uses equal or less energy than the basic requirements according to the simulation, the building complies with the Energy Standards.

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