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Unfaced batt insulation completely fills the wall cavities.

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This assembly for above-grade or below-grade garage walls in any climate zone uses a hybrid of continuous rigid insulation and cavity insulation on the interior side of the wall.

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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

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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.

This hot climate zone home uses high quality batt insulation between studs to insulate this connecting garage wall.

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

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This assembly for above-grade and below-grade garage walls in any climate zone uses continuous rigid insulation along the interior of the wall.

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This wall assembly for above-grade garage walls uses cavity insulation and should only be used in IECC Climate Zones 4 or lower due to the risk of condensation on the interior surface of the concrete wall.

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Rigid foam insulation is installed on the garage side of the shared garage wall and roof of an existing home

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Plan view (from above) showing how the existing garage wall gypsum board is cut away to air-seal the shared wall before adding rigid foam insulation on the garage and exterior walls of the home.

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Side view showing how the existing garage wall and ceiling are air-sealed prior to installing rigid foam insulation on the garage side of the shared wall of an existing home.

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Heated or partially heated garages with podium decks should be thermally isolated from both ambient exterior space and interior conditioned space by insulating the interior of the garage walls and ceiling and extending the insulation below grade.

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To ensure a complete air barrier between the garage and the house, the wall between the garage and the house was insulated and air-sealed with four inches of high-density spray foam.

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Side view showing air-sealing and rigid foam insulation is installed over existing wall and ceiling under a room above, then covered with new gypsum board.

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Assembly can be used in IECC CZ 3 and above to thermally isolate garages in multifamily row houses with slab foundations. For unheated garages, it is unnecessary to insulate wall between garage and exterior of slab or slab underneath garage.

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Insulating Garages in Multifamily Buildings

Guide

Guide describing how to properly insulate garages in multifamily buildings.

Insulating Existing Floors over Garage

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

Insulating Heated Garage Plenums in Multifamily Buildings

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Guide describing methods for insulating heated garage plenums in multifamily parking garages.

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

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

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

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The original corner seam is air-sealed with caulk, then rigid foam is installed on the existing garage ceiling and walls, and finally covered with drywall.

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Garage Rim/Band Joist Adjoining Conditioned Space

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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.