Basic Concepts Identify where air leakage occurs in the home Types of materials used to stop air leakage

Two conditions needed for air leakage: –A hole –Driving force across the hole AIR

Lots Of Driving Forces Image courtesy of Southface Institute humidity rain heat wind humidity StackEffect Fans heat water radon

Driving forces move air in predictable directions MorePressureMoistureHot LessPressureMoistureHot

You cant do anything about driving forces, so seal the holes! AIR

Air seeks the path of least resistance. Air will choose the largest available path.

Where is air leakage greatest in the home? Ducts Fireplaces Plumbing penetrations Doors Windows Fans and vents Electrical outlets Floors, walls and ceilings

Air Leakage

Big Holes Chases Plumbing penetrations Dropped ceilings Access panels Ceiling fixtures Ducts Sill plates Vents Window openings Door openings

Air Leakage Results In: Wasted energy Stack effect Drafts Discomfort

Floors and Ceilings

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

Caulk

Foam

Weatherstripping

Weatherstripping Doors

Outlets and Switches

What Caulking to Use?

What Kind of Weatherstripping?

Chimneys

Storm Windows

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

For More Information Major Resources: – building_america/ –