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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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Install rigid insulation and finish material below the framing and cavity insulation of a building overhang

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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.

Band joist insulation and air sealing

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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.

Right - Foil-faced polyisocyanurate insulating rigid foam sheathing is installed rather than fibrous insulation below the floor framing of this house built on piers

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Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Guide

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

Building America Energy Performance Brief: Insulating and Air Sealing Cantilevered Floors

Case Study

Case study describing the proper techniques and steps in insulating and air sealing a cantilevered floor, as well as the consequences for failing to do so properly.

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

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

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Right - Closed-cell spray foam covers the ceiling and joists to insulate and air-seal the ceiling deck.

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The ceiling over an unconditioned space is insulated with closed-cell spray foam that fills the ceiling cavities and encapsulates the framing

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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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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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Right - Foil-faced polyisocyanurate insulating rigid foam sheathing is installed below the floor framing of this house built on piers; however, the seams should be sealed with metal taped and the plumbing elevated and protected.

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The fiberglass insulation stuffed into the large hole around this HVAC duct will not prevent air leakage from the unconditioned basement to the conditioned space above; the large gap should be sealed with a rigid air barrier and caulked or spray foamed.

Fiberglass insulation stuffed into the large hole around this HVAC duct won't prevent air leakage from the unconditioned basement to the conditioned space above; the large gap should be sealed with a rigid air barrier and caulked or spray foamed.

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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.

Air Sealing Duct and Flue Shafts

Guide

Guide describing how to air-seal duct and flue shafts.

The application of intumescent coating/protection layer protects this elevated floor system from below.

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New Whole-House Solutions Case Study: Tindall Homes: The Legends at Mansfield, Columbus, NJ

Case Study

Case study describing a new construction building project of 20 luxury homes in northern New Jersey that were more energy efficient than ENERGY STAR and met the 50% energy savings requirements of the federal tax credit for new homes.

An IR camera image shows gaps around HVAC flue pipes allow conditioned air to leak through blown fiberglass into the attic

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Cold Climate Building Techniques and Concepts: building a raised floor

Video

Video from Cold Climate Housing Research Center describing building a raised floor in cold climates for air-sealing and insulation purposes.

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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