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Air seal and insulate drawer and closet boxes in attic kneewalls

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Attic Air Sealing, Insulating, and Ventilating for Ice Dam Prevention

Information Guide

Information guide describing proper attic air-sealing, insulation, and ventilation to combat ice dam formation on roofs in cold climate zones.

Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Guide

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

Air Sealing, Insulating, and Venting Attics and Roofs to Reduce Heat Gain

Information Guide

Information guide providing links to guides describing specific ways to air-seal, insulate, and ventilate attics and roofs to minimize heat gain in new and existing homes.

Insulate and air seal the shaft around a skylight in a vented attic

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

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Air seal the attic access pull-down stairs opening with weatherstripping.

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Air sealing at porch roof at 1/2 inch plywood exterior sheathing

CAD File

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.

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Spray foam insulates and air seals the exterior wall behind the fireplace.

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Extra-wide air sealing tape seals seam where the structural insulated panels (SIPs) that form the roof and walls meet.

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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.

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

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Air sealing wall between a porch roof and attic with 1 inch of rigid insulation

CAD File

Duct boots and other ceiling penetrations are air-sealed using spray foam

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Air Sealing Retrofits: Conducting an IR Camera Inspection of an Existing Home - Fireplaces

Video

Video showing how to use an infrared camera to check for air leakage around a fireplace during a blower door test in winter.

Right - Spray foam insulates and air-seals the stone walls of this unvented crawlspace.

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Right - Section view showing how to air-seal and insulate a basement wall with perforated blanket insulation by installing it over air-sealed rigid insulation board to reduce condensation risk in the fiberglass blanket.

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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.

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Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

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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Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations

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Air seal and insulate drawer and closet boxes in attic kneewalls

Attic Air Sealing, Insulating, and Ventilating for Ice Dam Prevention

Insulating and Air Sealing Existing Floors above Unconditioned Spaces

Air Sealing, Insulating, and Venting Attics and Roofs to Reduce Heat Gain

Insulate and air seal the shaft around a skylight in a vented attic

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

Air seal the attic access pull-down stairs opening with weatherstripping.

Air sealing at porch roof at 1/2 inch plywood exterior sheathing

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

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

Spray foam insulates and air seals the exterior wall behind the fireplace.

Extra-wide air sealing tape seals seam where the structural insulated panels (SIPs) that form the roof and walls meet.

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

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

Air sealing wall between a porch roof and attic with 1 inch of rigid insulation

Duct boots and other ceiling penetrations are air-sealed using spray foam

Air Sealing Retrofits: Conducting an IR Camera Inspection of an Existing Home - Fireplaces

Right - Spray foam insulates and air-seals the stone walls of this unvented crawlspace.

Right - Section view showing how to air-seal and insulate a basement wall with perforated blanket insulation by installing it over air-sealed rigid insulation board to reduce condensation risk in the fiberglass blanket.

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.

Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

Spray foam insulates and air-seals the ceiling deck and top plates of this vented attic.

The baffle is air sealed in place with spray foam before installing fiberglass or cellulose insulation

Air Sealing Retrofits: Conducting an IR Camera Inspection of an Existing Home - Recess Lighting

Spray foam insulation is installed in open wall cavities to air seal and insulate

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

Air Sealing Retrofits: Conducting an IR Camera Inspection of an Existing Home - Ceilings and Supply Grills

Spray foam insulation insulates and air seals around plumbing pipes and top plates in the attic.

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

Provide flashing and sealing integrated with the air and water control layers for vents and other roof penetrations