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Spray foam insulation air-seals and insulates the floor above the garage; the joist will be filled with fibrous insulation in this flash-and-batt approach.

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Insulating Existing Floors over Garage

Guide

Guide describing how to insulate and air seal the floor joists over a garage when there is loving space above the garage.

Insulation Installation Guide: Air Sealing Garage

Video

Video describing a technique for airtight drywall installation on garage walls using foam gasket strips.

Rigid foam insulating sheathing installed over an existing garage ceiling with retrofits to air seal exterior wall before adding exterior wall insulating sheathing

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Rigid Foam Insulation Installed Between Existing House and Garage Walls

Guide

Guide describing how to upgrade walls that separate the garage from the house by providing a continuous air control layer on the garage side of the wall and adding rigid foam insulation.

Right – Spray foam insulates the walls and ceilings separating the garage from the home.

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Air barrier at garage band joist - 1 inch rigid insulation with 1x3 wood furring

CAD File

Air barrier at garage band joist - 1 inch rigid insulation with 2x2 wood furring

CAD File

Air barrier at garage band joist - 1 1/2 inch rigid insulation with 2x4 sleepers

CAD File

Wrong - Rigid insulation blocking is installed but not air-sealed with spray foam around edges.

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Right - Walls and ceilings shared by the garage and living space must be air sealed and insulated.

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Wrong - The faced batt insulation does not provide an air barrier in the joist bay between the garage and the conditioned space of the home.

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Right – Closed-cell spray foam insulates and air-seals the rim joist above a shared wall between the garage and living space.

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Rigid foam insulating sheathing is installed on existing garage ceiling and covered with a new gypsum board fire protection layer installed over the foam.

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Right – Closed-cell spray foam insulation in the shared wall between the garage and living space helps to air-seal the wall and protect occupants from garage pollutants.

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Garage Rim/Band Joist Adjoining Conditioned Space

Video

Video describing best practices for air sealing an attached garage during construction using plywood and spray foam in the band joist and providing an exhaust fan to ventilate and depressurize the attic.