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Preventing Garage-to-House Pollution Transfer in Old Houses

It is much harder to prevent air movement from a garage to a house in an existing house. In a house already built, there will be leakage areas but they are usually hidden. They are not easy to locate and not easy to seal.

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Preventing Garage-to-House Transfer in New Houses

The best way to prevent garage air entry into the house is to make sure that there are no leaks between the garage and the house. In new construction, this should be easy. The builder should make the interface walls and ceilings as airtight as possible. This is more readily done if the builder knows that reducing pollution transfer from the garage is a priority.

The builder should:

Ensure the airtightness of the garage ceiling and walls that are next to the house, before the insulation is installed and before installing drywall on the garage side.

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How Garage Air Gets Into Your House

It can be difficult to understand how and why garage air moves into the house. After all, there is at least one layer of drywall between the house and the garage, and a significant amount of insulation. The door from the attached garage to the house typically has weatherstripping and a spring to hold the door closed. So how does air enter?

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