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The builder installed this OSB under the roof rafters and air sealed the seams with tape then added a dropped drywall ceiling to provide a service cavity for ducts and wiring, while minimizing holes into the attic.

The builder installed this OSB under the roof rafters and air sealed the seams with tape then added a dropped drywall ceiling to provide a service cavity for ducts and wiring, while minimizing holes into the attic.
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The builder used spray foam in difficult-to-air seal spots like the rim joists.

The builder used spray foam in difficult-to-air seal spots like the rim joists.
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The ceiling and sides of this corridor service chase in a multifamily building are air-sealed with mudded and taped drywall prior to installing pipes, wiring, and ducts.

The ceiling and sides of this corridor service chase in a multifamily building are air-sealed with mudded and taped drywall prior to installing pipes, wiring, and ducts.
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The ceiling and sides of this service corridor in a multifamily building are air-sealed with mudded and taped drywall prior to installing pipes, wiring, and ducts.

The ceiling and sides of this service corridor in a multifamily building are air-sealed with mudded and taped drywall prior to installing pipes, wiring, and ducts.
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The ceiling drywall is sealed to the top plates with caulk.

The ceiling drywall is sealed to the top plates with caulk.
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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

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 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 spots on the ceiling in this infrared camera image likely indicate missing or displaced attic insulation.

The dark spots on the ceiling in this infrared camera image likely indicate missing or displaced attic insulation.
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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 drywall above the chase extends beyond adjoining top plates for a continuous air barrier

The drywall above the chase extends beyond adjoining top plates for a continuous air barrier
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The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier

The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
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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 floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing

The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing
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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.