H.B. No. 3314 introduces new energy efficiency performance standards specifically for residential construction, focusing on attic and rafter assemblies. The bill adds Section 388.0045 to Chapter 388 of the Health and Safety Code, which outlines compliance requirements for local jurisdictions regarding insulation in unvented attic or rafter assemblies. Under this new section, local jurisdictions must consider these assemblies compliant with energy code requirements if they meet specific insulation and air sealing criteria, including achieving certain R-values based on climate zones and passing a blower door test.

The bill specifies that for compliance, the building must also have a mechanical ventilation system that does not rely solely on negative pressure and outlines additional insulation requirements for exposed roof rafters. The legislation aims to enhance energy efficiency in residential buildings, thereby potentially reducing energy consumption and improving overall building performance. The act is set to take effect on September 1, 2025.

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