BASC Search | Building America Solution Center

Right – The backing on this knee wall was air sealed prior to insulation.

Right – The backing on this knee wall was air sealed prior to insulation.

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Seal the drywall to the top plates as part of the home’s continuous air barrier

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Air sealing at interior wall between conditioned space and unconditioned attic

Air sealing at interior wall between conditioned space and unconditioned attic

CAD File

Right - Spray foam fills the walls and rim joists to air seal and insulate while caulk seals the framing joints.

Right - Spray foam fills the walls and rim joists to air seal and insulate while caulk seals the framing joints.

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Spray foam insulates and air seals the underside of the attic roof and walls.

Spray foam insulates and air seals the underside of the attic roof and walls.

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Wrong – Rigid air barrier not properly sealed around skylight shaft

Wrong – Rigid air barrier not properly sealed around skylight shaft

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Right – Rigid air barrier properly sealed around skylight shaft

Right – Rigid air barrier properly sealed around skylight shaft

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Wrong – The backing on this knee wall was not air sealed prior to adding insulation.

Wrong – The backing on this knee wall was not air sealed prior to adding insulation.

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Wrong – Air barrier not sealed between porch attic and conditioned space

Wrong – Air barrier not sealed between porch attic and conditioned space

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Wrong – Air barrier not sealed between porch attic and conditioned space

Wrong – Air barrier not sealed between porch attic and conditioned space

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Air Sealing Best Practices and Code Compliance for Multifamily Area Separation Walls

Air Sealing Best Practices and Code Compliance for Multifamily Area Separation Walls

Presentation

Webinar describing the best practices for air sealing multifamily separation walls.

Wrong – There is no foam gasket or air-sealing between the sill plate and masonry foundation.

Wrong – There is no foam gasket or air-sealing between the sill plate and masonry foundation.

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Wrong – The batt insulation on this knee wall is not properly supported and there is no air sealed rigid backing to provide a solid air barrier.

Wrong – The batt insulation on this knee wall is not properly supported and there is no air sealed rigid backing to provide a solid air barrier.

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Wrong - The air barrier is not sealed (picture taken from garage looking into house).

Wrong - The air barrier is not sealed (picture taken from garage looking into house).

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Right – Air barrier and penetrations sealed between porch attic and conditioned space

Right – Air barrier and penetrations sealed between porch attic and conditioned space

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Pumpkin Ridge Passive House Video #15: Window Install Prep & Air Sealing

Video

Video describing how to prep and air seal the wall cavity for window installation.

Wrong - Rigid insulation blocking is installed but not air-sealed with spray foam around edges.

Wrong - Rigid insulation blocking is installed but not air-sealed with spray foam around edges.

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Right - Walls and ceilings shared by the garage and living space must be air sealed and insulated.

Right - Walls and ceilings shared by the garage and living space must be air sealed and insulated.

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Right - Mastic is being installed to air seal the wood-to-wood joints in this wall.

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Wrong - The caulk is too far from the sill plate to effectively air-seal the gap.

Wrong - The caulk is too far from the sill plate to effectively air-seal the gap.

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Measure Guideline: Wall Air Sealing and Insulation Methods in Existing Homes - An Overview of Opportunity and Process

Reference

Document providing renovators and retrofit contractors an overview of considerations when including wall air sealing and insulation in an energy retrofit project.

Right – The base of the wall is water proofed and the seam between the base of the wall and the sidewalk is air sealed.

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One way to air seal and insulate kneewalls – add insulation and a rigid air barrier along roof line of unconditioned attic space outside kneewall

One way to air seal and insulate kneewalls – add insulation and a rigid air barrier along roof line of unconditioned attic space outside kneewall

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Frame, insulate, and air seal the walls of the skylight shaft as you would an exterior wall

Frame, insulate, and air seal the walls of the skylight shaft as you would an exterior wall

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Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage

Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage

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Plan view of electric box installation in exterior wall showing flashing and air sealing details

Plan view of electric box installation in exterior wall showing flashing and air sealing details

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Section view of electric box installation in exterior wall showing flashing and air sealing details

Section view of electric box installation in exterior wall showing flashing and air sealing details

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Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces

Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces

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Right – Tape and spray foam are used to air seal around pipes that extend through exterior walls.

Right – Tape and spray foam are used to air seal around pipes that extend through exterior walls.

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Wrong – No air barrier installed between the walls and a larger gap between the walls that needs sealing

Wrong – No air barrier installed between the walls and a larger gap between the walls that needs sealing

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