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Insulated cantilever floor - cavity insulation with 1 inch rigid insulation closure

Insulated cantilever floor - cavity insulation with 1 inch rigid insulation closure

CAD File

Insulated cantilever floor - cavity insulation with 1 1/2 inch rigid insulation closure

Insulated cantilever floor - cavity insulation with 1 1/2 inch rigid insulation closure

CAD File

Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 1x3 wood furring

Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 1x3 wood furring

CAD File

Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

CAD File

Insulated floor above garage - cavity insulation with 1 1/2 inch rigid insulation with 2x4 sleepers

Insulated floor above garage - cavity insulation with 1 1/2 inch rigid insulation with 2x4 sleepers

CAD File

Insulated floor above garage - cavity insulation with 1 1/2 inch rigid insulation with 1x3 wood furring

Insulated floor above garage - cavity insulation with 1 1/2 inch rigid insulation with 1x3 wood furring

CAD File

Insulation support

Insulation support

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

CAD File

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.

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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Misaligned floor insulation

Misaligned floor insulation

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Correctly insulated floor

Correctly insulated floor

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

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.

Wrong – Cantilever is not blocked or insulated.

Wrong – Cantilever is not blocked or insulated.

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Batt insulation is installed at the attic floor

Batt insulation is installed at the attic floor

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Band joist insulation and air sealing

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Batt insulation is not an effective air barrier

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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

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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EPS Foam Insulation | Madrona Passive House

Video

Video discussing the EPS foam insulation used on the floor of a passive house.

Wrong – Insulation is misaligned with floor above

Wrong – Insulation is misaligned with floor above

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Right – Insulation is in contact with floor above

Right – Insulation is in contact with floor above

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Wrong - Rim joist cavity missing insulation

Wrong - Rim joist cavity missing insulation

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Cantilever floor with insulation and air blocking

Cantilever floor with insulation and air blocking

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Wrong - This batt insulation is not aligned with the subfloor and joists.

Wrong - This batt insulation is not aligned with the subfloor and joists.

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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

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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Existing band joist insulation retrofit with spray foam

Existing band joist insulation retrofit with spray foam

CAD File

Cover bottom of cantilever area with rigid foam insulation

Cover bottom of cantilever area with rigid foam insulation

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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.

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.