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Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist

Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
Video:

Cabin in the Woods Part 13: Installing Standing Seam Metal Roof

Video:

Capillary Break Beneath Slab - Polyethylene Sheeting or Rigid Insulation Over Aggregate

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Cavity used for return is not insulated and is not air sealed, which will pull in air from outside

Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
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Cavity was not air sealed

Cavity was not air sealed
Video:

CCHRC Building Addition: Creating a Heated Roof to Apply Roofing Membrane

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Ceiling, wall, floor, and slab insulation levels shall meet or exceed Builders Challenge levels

Ceiling, wall, floor, and slab insulation levels shall meet or exceed Builders Challenge levels
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Central heat pump water heaters like this fully packaged system provide efficient, reliable domestic hot water for multifamily buildings; storage tanks are within the enclosure, and the heat pump is seen just outside.

Central heat pump water heaters like this fully packaged system provide efficient, reliable domestic hot water for multifamily buildings; storage tanks are within the enclosure, and the heat pump is seen just outside.
Presentation:

Checking Your Work: Properly Installed HVAC in High-Performance Homes

Presentation:

Checking Your Work: Properly Installed HVAC in High-Performance Homes

Video:

Choosing ENERGY STAR Water Heaters with Build Show

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Clean taping areas and install 3" tape on vertical joint of upper insulation overlapping the horizontal joint

Clean taping areas and install 3" tape on vertical joint of upper insulation overlapping the horizontal joint
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Clean the attic floor of debris prior to installing new attic insulation. Use baffles to provide a path for ventilation air entering the attic from the soffit vents

Clean the attic floor of debris prior to installing new attic insulation. Use baffles to provide a path for ventilation air entering the attic from the soffit vents
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Closed-cell spray foam insulation covers the attic floor to provide a continuous air control layer.

Closed-cell spray foam insulation covers the attic floor to provide a continuous air control layer.
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Compact duct design layout

Compact duct design layout
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Complete Window and Frame Replacement

Video:

Concrete Slab over Polyethylene

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Condensation can form between the interior removable storm window and the existing window if the storm window is not air tight

Condensation can form between the interior removable storm window and the existing window if the storm window is not air tight
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Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions

Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
Video:

Continuous Rigid Insulation Sheathing/Siding (1)

Video:

Continuous Rigid Insulation Sheathing/Siding (2)

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Contractors install gasket between the second-story top plate and the rim joist to air seal at this wall to attic transition (Source: S&A Homes).

Contractors install gasket between the second-story top plate and the rim joist to air seal at this wall to attic transition (Source: S&A Homes).
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Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct

Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
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Cut the duct to the length needed

Cut the duct to the length needed