H.B. No. 3314 introduces new energy efficiency performance standards specifically for residential construction in Texas. The bill amends Chapter 388 of the Health and Safety Code by adding Section 388.0045, which outlines compliance requirements for unvented attic and unvented enclosed 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 a minimum R-value for insulation based on climate zones and passing a blower door test for air leakage.

The bill specifies that the insulation must be air impermeable and outlines additional conditions related to mechanical ventilation systems and insulation installation. It also clarifies that certain insulation requirements may be waived if specific conditions are met, such as the rafters being covered by drywall or continuous insulation being installed above the roof deck. This legislation is set to take effect on September 1, 2025.

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