Air Tightness

Air tightness refers to how well a building prevents unwanted air from leaking in or out. It’s like the building's own barrier against drafts, heat loss, and air contamination. Good air tightness improves energy efficiency, reduces heating and cooling costs, and enhances comfort and indoor air quality. Achieving proper air tightness involves sealing gaps around windows, doors, and other penetrations to ensure the building maintains a controlled indoor environment. Proper testing, such as blower door tests, measure how airtight a building is, helping identify areas that need additional sealing.