Air sealing is an essential part of creating an efficient, durable, and healthy home. Air leakage or infiltration occurs when outdoor air enters a home uncontrolled through cracks, gaps, and openings. Homes with higher air leaks are significantly less energy efficient than well-sealed homes. Air leaks occur when outside air enters and the air conditioner leaves the house uncontrolled through cracks and openings.
It is not recommended to rely on air leaks for natural ventilation as this can lead to poor indoor air quality and moisture problems. Sealing cracks and openings reduces drafts and cold spots, improving comfort. Airtight sealing solves the problem of excess air flow to ensure that your home has all the fresh air it needs, but without making you feel uncomfortable. It also helps to keep excess moisture away, protecting the structural integrity of your investment and the overall health of your home.
The cost of hermetic sealing varies depending on the size and location of the home, as well as the scope of the project. A house that is well insulated but that is not (or is poorly) sealed from the air will still have air infiltration into the house where it shouldn't. The air seal can be installed together with the insulation, but first you have to do an energy audit and test the door fan. Between hermetic sealing and insulation, the former will make your home more energy efficient, since you will eliminate leaks, gaps and openings. The best way to find out where to place the hermetic seal in your home is to request an energy audit from a certified contractor. A contractor specializing in home construction that performs hermetic sealing work will generally concentrate on the basement and attic to minimize the chimney effect and thus minimize unwanted air movement throughout the house.
Hermetic attic sealing (and duct sealing) solves these problems by plugging these holes with expandable spray foam so that excess air can no longer pass through.
Like Simon & Garfunkel, air sealing and insulation work better together, since they are the yin of each other's yang. According to Energy Star, EPA estimates savings of 15% in heating and cooling costs if air is properly sealed and insulation is added.