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Where the interior wall intersects the corridor wall in this multifamily building, the first intersecting wall stud is sealed to the corridor wall along both sides; other seams and penetrations in the exterior wall are also sealed

Where the interior wall intersects the corridor wall in this multifamily building, the first intersecting wall stud is sealed to the corridor wall along both sides; other seams and penetrations in the exterior wall are also sealed
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While heat loss at a glass sliding door is to be expected, the very dark area along the door in this IR camera image indicates significant heat loss that could be due to a badly aligned door, missing weather stripping, or air leakage

While heat loss at a glass sliding door is to be expected, the very dark area along the door in this IR camera image indicates significant heat loss that could be due to a badly aligned door, missing weather stripping, or air leakage below the door frame.
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Whole house fan cover details

Whole house fan cover details
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Whole house fans draw cool night-time air in through open windows and expel hot house air into the vented attic

Whole house fans draw cool night-time air in through open windows and expel hot house air into the vented attic
Video:

Window and Door Rough Openings

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Window not caulked or sealed

Window not caulked or sealed
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Wire hardware mesh is fastened with a staple gun and screws to the wall to prevent pests from entering the building through small holes and cracks

Wire hardware mesh is fastened with a staple gun and screws to the wall to prevent pests from entering the building through small holes and cracks
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With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.

With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.
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Wood siding installation details for tongue-and-groove horizontal siding.

Wood siding installation details for tongue-and-groove horizontal siding.
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Wrap the air-sealed chimney with mineral wool insulation to prevent contact with the warm brick when attic insulation is re-installed around the chimney

Wrap the air-sealed chimney with mineral wool insulation to prevent contact with the warm brick when attic insulation is re-installed around the chimney
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Wrong - Area around window framing not air sealed

Wrong - Area around window framing not air sealed
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Wrong - Area around window framing not air sealed

Wrong - Area around window framing not air sealed
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Wrong - Around electrical box unsealed

Wrong - Around electrical box unsealed
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Wrong - Basement rim joist not sealed.

Wrong - Basement rim joist not sealed.
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Wrong - Basement window not sealed.

Wrong - Basement window not sealed.
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Wrong - Bathroom fan not caulked and sealed

Wrong - Bathroom fan not caulked and sealed
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Wrong - Bathroom fan not caulked and sealed

Wrong - Bathroom fan not caulked and sealed
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Wrong - Batt insulation does not provide complete coverage across the attic floor so ceiling joists are exposed resulting in thermal bridging.

Wrong - Batt insulation does not provide complete coverage across the attic floor so ceiling joists are exposed resulting in thermal bridging.
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Wrong - Bay window missing drywall gasket

Wrong - Bay window missing drywall gasket
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Wrong - Cantilevered joist bay cavities are not air sealed with a solid air barrier, allowing outside air to flow between floors.

Wrong - Cantilevered joist bay cavities are not air sealed with a solid air barrier, allowing outside air to flow between floors.
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Wrong - Cardboard should be removed from under toilet base.

Wrong - Cardboard should be removed from under toilet base.
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Wrong - Common wall sheathing not properly fastened or sealed

Wrong - Common wall sheathing not properly fastened or sealed
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Wrong - Dark pattern on wall is showing where warm air is leaking into the wall cavity from interior of home.

Wrong - Dark pattern on wall is showing where warm air is leaking into the wall cavity from interior of home.
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Wrong - Dark patterns on the Home's exterior siding show where warm air is leaking into the wall cavities.

Wrong - Dark patterns on the Home's exterior siding show where warm air is leaking into the wall cavities.