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Improved building codes will always carry risks and resistance:

• Increased material costs - Additional insulation or more durable air barriers cost more. Estimating and predictable timing becomes more difficult.
• Inspections and commissioning - The construction process will have more stops to undergo blower door testing and inspections for quality. Site built houses may have a long period of fixing deficiencies to meet targets.
• Skills gap - Workers need to be trained on new, more stringent targets and more detailed processes. Little time to learn a lot of new things.
• Selling better performance is challenging - Homeowners, Homebuyers, and Real Estate, may not know or care about air barrier improvements.
• Poor Performance? - If a building doesn't meet the targets, then what happens? Massive renovation and retrofit challenges are looming with any code changes and mandated performance metrics for existing buildings.