Air Sealing
Air sealing is the construction practice of closing intentional and unintentional gaps in the building envelope so that air, moisture, and outdoor pollutants stop moving through the wall, ceiling, and floor assemblies. It is one of the highest-ROI energy retrofits — a tightly air-sealed home with code-minimum insulation often outperforms a leaky home with twice the insulation. Common air sealing measures include taping sheathing seams, gasketing the rim joist, foaming around penetrations, and weatherstripping doors and the attic hatch.