Basic Concepts Identify where air leakage occurs in the home Types of materials used to stop air...
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Transcript of Basic Concepts Identify where air leakage occurs in the home Types of materials used to stop air...
![Page 1: Basic Concepts Identify where air leakage occurs in the home Types of materials used to stop air leakage.](https://reader035.fdocuments.us/reader035/viewer/2022070306/5518ab98550346a61f8b4cac/html5/thumbnails/1.jpg)
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Basic Concepts
• Identify where air leakage occurs in the home
• Types of materials used to stop air leakage
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Two conditions needed for air leakage:
– A hole– Driving force
across the hole
AIR
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Lots Of Driving Forces
Image courtesy of Southface Institute
humidityhumidity
rainrain
windwind
humidityhumidity
FansFansheatheat
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Driving forces move air in predictable directions
MoreMorePressurePressureMoistureMoisture
HotHot
LessLessPressurePressureMoistureMoisture
HotHot
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You can’t do anything about driving forces,
so seal the holes!
AIR
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Air seeks the path of least resistance.
Air will choose the largest
available path.
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Where is air leakage greatest in the home?
• Ducts• Fireplaces• Plumbing
penetrations• Doors
• Windows• Fans and vents• Electrical outlets• Floors, walls and
ceilings
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Air Leakage
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Big HolesChases
Plumbing penetrations
Droppedceilings
Access panelsCeiling fixtures
Ducts
Sill plates
Vents
Window openings
Door openings
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Air Leakage Results In:
• Wasted energy• Stack effect• Drafts• Discomfort
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Floors and Ceilings
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Stopping the Leaks!
• Start at the top• Seal and insulate duct work • Seal low spots• Provide combustion air for
combustion appliances• Use caulk, foam or
weatherstripping
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Caulk
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Foam
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Weatherstripping
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Weatherstripping Doors
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Outlets and
Switches
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What Caulking to Use?
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What Kind of Weatherstripping?
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Chimneys
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Storm Windows
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Key Points:
• Air leakage results = energy loss and discomfort
• Seal air leaks at top first, then lower and be mindful of combustion equipment
• Cauling, foam and weatherstipping can be used to seal air leaks
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For More Information
• Major Resources:– http://www.eere.energy.gov/
buildings/building_america/
– http://www.energystar.gov/homes