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Air seal and insulate the rim and band joists of walls separating an attached garage from the home’s conditioned space.
Air seal the floor above a garage when there is living space above the garage and make sure floor insulation is in full contact with the underside of the subfloor.
Batt insulation is not an effective air barrier
Effective air barrier for the rim joist
Penetrations through subfloor air sealed
Right – Air barrier is present between garage and conditioned space
Right – Air barrier is present between garage and floor system
Right – Band is properly insulated and sealed
Right – Floor above garage is a continuous air barrier
Right – Insulation is in contact with floor above
Right – Penetrations through band properly sealed
The air tightness of the garage-to-house air barrier can be tested with a blower door kit and two manometers
Wrong – Band not properly sealed
Wrong – Floor system does not have air barrier to seperate it from garage
Wrong – Gaps without insulation and not properly sealed
Wrong – Insulation is misaligned with floor above
Wrong – No air barrier is present between garage and conditioned space
Wrong – No air barrier is present between garage and floor system