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Retrofit of cantilevered wall showing details at the inside corner for installing air sealing and rigid foam insulation in the wall and overhanging floor

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Retrofit of cantilevered wall with beam showing details at the outside corner for installing air sealing and rigid foam insulation in the wall and overhanging floor

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Retrofit of cantilevered wall showing details at the outside corner for installing air sealing and rigid foam insulation in the wall and closed-cell spray foam in the overhanging floor

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Right - Spray foam insulation air-seals the ceiling-to-drywall seams at the wall top plate.

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Retrofit of cantilevered wall with beam showing details at the outside corner for installing air sealing and rigid foam insulation plus water control membrane in the wall and overhanging floor

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Adding air-sealing and rigid foam insulation at the wall-to-overhanging floor juncture at the outside corner of an existing home

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ICF foundation walls wrap the floor slab in R-22 of insulation while the entire space under the slab is covered with 4.3 inches of closed-cell spray foam.

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Existing band joist insulation retrofit with 1 1/2 inch rigid insulation

CAD File

Insulating and Air Sealing Existing Floor Overhangs (Cantilevers)

Guide

Guide describing how to insulate a floor overhang (or cantilever) on an existing home by adding insulation and an air barrier to air seal the floor joist bays under the cantilever.

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.

Advanced Framing: Minimum Wall Studs

Guide

Guide describing how to frame a wall with minimal wall studs to prevent heat losses and gains through walls.

The attic kneewall and the open floor cavities under kneewall are both sealed and insulated in one step with spray foam insulation

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Existing band joist insulation retrofit with spray foam

CAD File

Retrofit of cantilevered foundation wall showing details at the inside corner for installing closed-cell spray foam in the wall and overhanging floor

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Rigid Foam Insulation Installed over Existing Foundation Slabs

Guide

Guide describing how to insulate an existing slab floor by adding rigid foam insulation over the slab then installing a floating subfloor.

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

Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Guide

Guide describing how to insulate a floor over an uninsulated basement or crawl space.

Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall

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The slab floor in this multistory multifamily building is continuous, providing the interior floors and balcony floors; rigid foam placed in gaps in the slab at the exterior wall helps to reduce thermal bridging

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After setting precast concrete basement walls on an 8-inch bed of trap rock, this builder sprayed 2 inches of closed-cell spray foam directly onto the ground then laid piping for radiant floor heating before pouring the concrete floor slab.

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Retrofit of cantilevered wall showing details at the inside corner for installing air sealing and rigid foam insulation in the wall and overhanging floor

Retrofit of cantilevered wall with beam showing details at the outside corner for installing air sealing and rigid foam insulation in the wall and overhanging floor

Retrofit of cantilevered wall showing details at the outside corner for installing air sealing and rigid foam insulation in the wall and closed-cell spray foam in the overhanging floor

Right - Spray foam insulation air-seals the ceiling-to-drywall seams at the wall top plate.

Retrofit of cantilevered wall with beam showing details at the outside corner for installing air sealing and rigid foam insulation plus water control membrane in the wall and overhanging floor

Adding air-sealing and rigid foam insulation at the wall-to-overhanging floor juncture at the outside corner of an existing home

ICF foundation walls wrap the floor slab in R-22 of insulation while the entire space under the slab is covered with 4.3 inches of closed-cell spray foam.

Existing band joist insulation retrofit with 1 1/2 inch rigid insulation

Insulating and Air Sealing Existing Floor Overhangs (Cantilevers)

Insulating Existing Floors over Garage

Advanced Framing: Minimum Wall Studs

The attic kneewall and the open floor cavities under kneewall are both sealed and insulated in one step with spray foam insulation

Existing band joist insulation retrofit with spray foam

Retrofit of cantilevered foundation wall showing details at the inside corner for installing closed-cell spray foam in the wall and overhanging floor

Rigid Foam Insulation Installed over Existing Foundation Slabs

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

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

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

Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall

The slab floor in this multistory multifamily building is continuous, providing the interior floors and balcony floors; rigid foam placed in gaps in the slab at the exterior wall helps to reduce thermal bridging

After setting precast concrete basement walls on an 8-inch bed of trap rock, this builder sprayed 2 inches of closed-cell spray foam directly onto the ground then laid piping for radiant floor heating before pouring the concrete floor slab.

New Orleans House Profile

Building Code Training - Residential Thermal Envelope - Air Sealing

Conceptual air sealing strategy at upper floor band joist