The bill, S.B. No. 2102, introduces new energy efficiency performance standards specifically for residential construction in Texas. It 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. Local jurisdictions are required to 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, passing a blower door test, and ensuring proper mechanical ventilation.

The new standards stipulate that the attic or rafter assembly must be insulated with air impermeable insulation to an R-value of at least 20 or 26, depending on the climate zone, and the building must contain its heating, cooling, and ventilation equipment within its thermal envelope. Additional provisions detail insulation requirements for exposed roof rafters and conditions under which they may not need to be covered. The bill is set to take effect on September 1, 2025.

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