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Image:

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

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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The combustible siding product on the left side in this demonstration burns readily when exposed to a burning wood sample, while the noncombustible siding on the right does not ignite

The combustible siding product on the left side in this demonstration burns readily when exposed to a burning wood sample, while the noncombustible siding on the right does not ignite
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The cut edge of the vinyl siding is slid up into the under-sill trim until the raised lugs catch in the J-channel.

The cut edge of the vinyl siding is slid up into the under-sill trim until the raised lugs catch in the J-channel.
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The dark areas in this IR camera image show air leakage coming up from the bottom plate along the wall. It is especially cold in the corner where the two exterior walls meet.

The dark areas in this IR camera image show air leakage coming up from the bottom plate along the wall. It is especially cold in the corner where the two exterior walls meet.
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The dark purple areas and long streaks in this IR camera image show extreme cold spots along the top of the walls, indicating a lack of both air sealing and insulation above the top plates of these walls.

The dark purple areas and long streaks in this IR camera image show extreme cold spots along the top of the walls, indicating a lack of both air sealing and insulation above the top plates of these walls.
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The dark purple lines and streaks around the attic access hatch and along the wall top plate in this infrared camera image indicate air leakage that could be fixed with weather stripping around the access hatch and spray foam over the top plate.

The dark purple lines and streaks around the attic access hatch and along the wall top plate in this infrared camera image indicate air leakage that could be fixed with weather stripping around the access hatch and spray foam over the top plate
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The dark purple patches at the sill and streaks at the meeting rail of the window in this IR camera image indicate heat loss and significant air leakage.

The dark purple patches at the sill and streaks at the meeting rail of the window in this IR camera image indicate heat loss and significant air leakage.
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The dark spots and streaks on this infrared camera photo clearly show cold air leaking in through gaps around a bathroom exhaust fan

The dark spots and streaks on this infrared camera photo clearly show cold air leaking in through gaps around a bathroom exhaust fan
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The dark streaks seen in this infrared camera image of a return vent in a ceiling indicate cooler air is leaking in around the vent.

The dark streaks seen in this infrared camera image of a return vent in a ceiling indicate cooler air is leaking in around the vent.
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The door sweep should be installed level to the door, positioned such that the bottom edge touches the door threshold.

The door sweep should be installed level to the door, positioned such that the bottom edge touches the door threshold.
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The duct sealing spray injection system application tunnel inflates as the injection system operates

The duct sealing spray injection system application tunnel inflates as the injection system operates
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The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)

The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)
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The duct tester and blower door are set up to measure leakage to the outdoors

The duct tester and blower door are set up to measure leakage to the outdoors
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The electrical conduit (metal) on the left has been sealed to the subfloor using fire-rated caulk, while the penetration for the yellow electrical wire on the right has not been air-sealed yet.

The electrical conduit (metal) on the left has been sealed to the subfloor using fire-rated caulk, while the penetration for the yellow electrical wire on the right has not been air-sealed yet.
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The exterior caulking around this window is clearly cracked and peeling, indicating that the caulking is no longer performing well and should be replaced.

The exterior caulking around this window is clearly cracked, indicating that the caulking is no longer performing well and should be replaced.
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The fan was removed from this exhaust fan box to access and air seal the seams with metal tape and the holes in the housing with canned spray foam

The fan was removed from this exhaust fan box to access and air seal the seams with metal tape and the holes in the housing with canned spray foam
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The final or top course of vinyl siding is trimmed if needed and attached to the wall with shimmed utility trim.

The final or top course of vinyl siding is trimmed if needed and attached to the wall with shimmed utility trim.
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The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.

The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.
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The gaps around this duct boot are sealed with canned spray foam.

The gaps around this duct boot are sealed with canned spray foam.
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The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.

The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.
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The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.

The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.
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The grey ring around the back of this LED retrofit ceiling fixture trim kits is a foam gasket to air seal the fixture.

The grey ring around the back of this LED retrofit ceiling fixture trim kits is a foam gasket to air seal the fixture.
Case Study:

The Habitat for Humanity of Metro Denver Zero Energy Demonstration Home

Image:

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.