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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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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.

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

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

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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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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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Building Code Training - Residential Thermal Envelope - Air Sealing

Presentation

Presentation describing the Georgia State Minimum Standard Energy Code air barrier requirements, envelope concepts including air flow and thermal properties, and common missed insulation and air-sealing opportunities.