Air Sealing


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An average home leaks 60% of its air every hour. This leakage rate changes depending on weather: it will be higher during extreme weather and lower when it’s mild. A good analogy is to think of your house as a boat. A boat that was this leaky would sink in one hour! Here’s the cycle of air leakage that costs you money and causes homecomfort problems:

  1. You pay to heat or cool the air in your home.
  2. A large percentage of that conditioned air escapes to the outside.
  3. An equal amount of outside, unconditioned air enters your home.
  4. Your bill is significantly more to heat or cool the air in a leaky home.

The arrows in this illustration demonstrate the many places air leaks from homes.

In order for a home to be energy efficient and comfortable, these leaks must be sealed properly and safely. 

2. Benefits

Energy Savings
Sealing air leaks is the quickest and cheapest energy improvement you can make. Actual savings vary for each home, but it is possible to reduce energy costs by one-third. Sealing air leaks can save money in other ways, because a tighter home envelop allows for smaller-capacity heating and cooling equipment.

Comfortable Living
Sealing air leaks is one key way to even out the temperature in a room. Wouldn’t it be nice not to have your feet freezing in the winter because the floor is always cold, even when the thermostat says your home is heated to the proper setting?

Safety & Indoor Air Quality
When tightening up your home, it’s important to be sure that you maintain adequate levels of ventilation. A leaky home has plenty of ventilation, but this uncontrolled ventilation brings with it unnecessarily high energy costs and poor comfort. In older homes, it’s unlikely that you will make the home too tight. The best way to reduce air leaks and implement the right ventilation strategy is to hire an us to run a blower door test.

Making sure air flow is properly controlled and your home has adequate ventilation can improve indoor air quality.

Increased Home Value
A study by The Appraisal Journal found that the selling price of homes increased by $20.73 for every $1 decrease in energy bills. If your energy bills average $1,500/yr. and you saved $400/yr., your home value would increase by $8,300.

According to ENERGY STAR?, energy use for an average home is responsible for twice as much pollution as the average car. Taking measures to seal leaks reduces the greenhouse gas emissions released into the atmosphere.


3. Equipment & Services

  • We use a blower door and other diagnostic tools to evaluate air leakage.
  • Cellulose insulation is sometimes recommended for sealing air leaks. When insulating a wall, it is applied  as a dense pack.
  • Materials used to seal air leaks include caulk, expanding foam sealant, backer rod or crack filler, weather stripping and door sweeps.

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