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This attic access hatch is in the master bedroom closet ceiling - be prepared for falling insulation when you lift the hatch

This attic access hatch is in the master bedroom closet ceiling - be prepared for falling insulation when you lift the hatch
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This attic is insulated to R-64 with a hybrid application of 11 inches of open-cell spray foam (R-4.45/in) plus 2 inches of closed-cell spray foam (R-7.4/in) that completely fills the roof rafter cavities and encases the rafters.

This attic is insulated to R-64 with a hybrid application of 11 inches of open-cell spray foam (R-4.45/in) plus 2 inches of closed-cell spray foam (R-7.4/in) that completely fills the roof rafter cavities and encases the rafters.
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This attic was insulated with 5 inches of closed-cell spray foam on the underside of the roof deck plus 6.5 inches of blown fiberglass covered with sheetrock as a firebreak for a total R-58 roof assembly insulation value.

This attic was insulated with 5 inches of closed-cell spray foam on the underside of the roof deck plus 6.5 inches of blown fiberglass covered with sheetrock as a firebreak for a total R-58 roof assembly insulation value.
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This bath fan duct actually has a termination vent attached at the end of the duct but the vent is sitting on the attic floor instead of attaching through the roof so humid air is exhausting into the attic

This bath fan duct actually has a termination vent attached at the end of the duct but the vent is sitting on the attic floor instead of attaching through the roof so humid air is exhausting into the attic
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This bath fan duct is venting humid air directly into the attic and mold is visible on the roof sheathing above

This bath fan duct is venting humid air directly into the attic and mold is visible on the roof sheathing above
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This bathroom exhaust fan includes a fan and light

This bathroom exhaust fan includes a fan and light
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This bathroom exhaust fan needs to be cleaned

This bathroom exhaust fan needs to be cleaned
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This central ventilation system uses an energy recovery ventilator to supply air to the corridor and exhaust air from the elevator shaft of a multifamily building

This central ventilation system uses an energy recovery ventilator to supply air to the corridor and exhaust air from the elevator shaft of a multifamily building
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This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof

This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof
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This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow

This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow
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This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct

This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct
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This exterior vent has a louvered flap that opens when the bathroom exhaust fan is running and air is being exhausted outside

This exterior vent has a louvered flap that opens when the bathroom exhaust fan is running and air is being exhausted outside
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This exterior vent has a louvered flap that should close fully when the exhaust fan is turned off

This exterior vent has a louvered flap that should close fully when the exhaust fan is turned off
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This exterior vent has a single flap that opens when the bathroom exhaust fan is running and air is being exhausted outside

This exterior vent has a single flap that opens when the bathroom exhaust fan is running and air is being exhausted outside
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This finished retrofit installation of radiant barrier in attic shows the air spaces at the soffit and ridge to promote attic ventilation

This finished retrofit installation of radiant barrier in attic shows the air spaces at the soffit and ridge to promote attic ventilation
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This home was designed with continuous roof vents and few roof penetrations, allowing more room for the solar shingles that integrate with the asphalt shingles installed to meet IBHS Fortified Roof criteria for increased resistance to high winds and rain

This home was designed with continuous roof vents and very few roof penetrations, allowing more room for the solar shingles that integrate with the asphalt shingles installed to meet IBHS Fortified Roof criteria for increased resistance to high winds and wind-driven rain.
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This hood covers an exhaust vent for a bath fan exterior vent; this hood is improperly installed and the top does not lap under the siding so water can easily get behind it

This hood covers an exhaust vent for a bath fan exterior vent; this hood is improperly installed and the top does not lap under the siding so water can easily get behind it
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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
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This interior wall is intersected by two ceilings of different heights; it is built as two walls stacked on one another, each having a bottom and top plate which act as barriers to airflow between levels.

This interior wall is intersected by two ceilings of different heights; it is built as two walls stacked on one another, each having a bottom and top plate which act as barriers to airflow between levels.
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This interior wall is intersected by two ceilings of different heights; without blocking installed at the level of the lower ceiling, a pathway for free airflow within the wall cavity or even into the attic is created.

This interior wall is intersected by two ceilings of different heights; without blocking installed at the level of the lower ceiling, a pathway for free airflow within the wall cavity or even into the attic is created.
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This is a soffit vent; it provides ventilation for a vented attic

This is a soffit vent; it provides ventilation for a vented attic
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This is the ceiling vent for a basic bathroom exhaust fan

This is the ceiling vent for a basic bathroom exhaust fan
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This kneewall has no top plate and the resulting gap provides a wide-open pathway for air and vapor to travel between the living space and the attic

This kneewall has no top plate and the resulting gap provides a wide-open pathway for air and vapor to travel between the living space and the attic
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This louvered vent cap works well for clothes dryer vent ducts because it has no screening that could trap dryer lint

This louvered vent cap works well for clothes dryer vent ducts because it has no screening that could trap dryer lint