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Air sealing
Air sealing means blocking small gaps where outside air leaks in and indoor air leaks out.
Why it matters
Leaks cause drafts and higher heating and cooling costs.
Where people get this wrong
Air sealing is not insulation. A tight house still needs planned ventilation.
Real-world example
A room feels chilly even when the thermostat says the temperature is fine. You feel a cold puff near an outlet on an exterior wall. Air sealing fixes that kind of hidden leak.
Where this hits your build
This affects comfort, energy costs, and indoor air quality. It gets locked behind drywall, so decisions here need to be right before finishing starts.
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