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Writer's pictureDustin Wiebold

The Importance of Air Sealing When Building a New House

Building a new house is an exciting process, filled with decisions about design, materials, and features that will define your home for years to come. Among the most crucial—and often overlooked—decisions is ensuring proper air sealing. While it may not be the most glamorous aspect of construction, air sealing is essential to creating an energy-efficient, comfortable, and durable home.


Air sealing sealants
Caulking and sealants used for air sealing

What is Air Sealing?

Air sealing involves closing off any gaps, cracks, or openings in the structure of a house where air can infiltrate or escape. This includes areas around windows, doors, electrical outlets, plumbing penetrations, and the building’s frame itself. Proper air sealing reduces the amount of outside air that enters your home and the amount of conditioned air that escapes. This simple concept plays a vital role in your home’s overall performance.


Sausage tube sealant gun
High-capacity caulking gun

Why is Air Sealing So Important?

  1. Energy Efficiency

One of the primary reasons air sealing is so important is its direct impact on energy efficiency. Without proper sealing, your home will have uncontrolled air leaks, causing heating and cooling systems to work much harder to maintain a consistent indoor temperature. According to the U.S. Department of Energy, air leaks can account for 25-40% of the energy used for heating and cooling in a typical home.

By sealing these leaks, you significantly reduce energy consumption, leading to lower utility bills. In fact, a well-sealed home can save homeowners hundreds of dollars annually. Beyond cost savings, reducing energy use also lowers your home’s carbon footprint, contributing to a more sustainable future.

  1. Improved Comfort

Air leaks can cause drafts, temperature fluctuations, and hot or cold spots throughout your home. This can make certain rooms uncomfortable, regardless of how much you adjust the thermostat. Proper air sealing helps create a more consistent and comfortable living environment by eliminating drafts and keeping conditioned air inside, where it belongs.

  1. Moisture Control

Inadequate air sealing can allow moisture to enter your home, which can lead to a host of problems, including mold growth, wood rot, and structural damage. Moisture infiltration is particularly problematic in areas with extreme weather conditions or high humidity. By properly sealing your home, you prevent moisture from entering and protect your home’s structural integrity.

  1. Better Indoor Air Quality

Uncontrolled air leaks can also allow outdoor pollutants, allergens, dust, and other contaminants to enter your home. This can negatively impact indoor air quality and exacerbate respiratory issues such as asthma or allergies. A well-sealed home keeps outdoor pollutants at bay, improving the overall quality of the air you breathe indoors.

  1. Enhanced Durability

Proper air sealing helps extend the life of your home by protecting it from environmental stressors. For example, by keeping out moisture and controlling airflow, you reduce the risk of structural damage and mold growth. This contributes to the longevity of your home's materials and reduces the need for costly repairs in the future.

Key Areas to Air Seal

When building a new home, certain areas are more prone to air leakage and require extra attention. These include:

  • Attic and roof penetrations (such as chimneys, vents, and ductwork)

  • Windows and doors (especially around the frames)

  • Wall joints and sill plates

  • Basement and crawlspace areas

  • Electrical outlets and switch plates

  • Plumbing and HVAC penetrations

It’s crucial to work with your builder to ensure that each of these areas is properly sealed during construction.


Window air sealing
Air sealing at a window

Air Sealing and Modern Building Standards

Today, many building codes and energy standards require new homes to meet specific air-sealing criteria. For example, the Home Energy Rating System (HERS) Index, used to measure energy efficiency, places significant emphasis on a home's ability to control air leakage. A lower HERS score indicates a more energy-efficient home, and achieving a low score often requires effective air sealing.

Programs such as ENERGY STAR® certification also mandate rigorous air sealing practices to ensure that homes meet high-efficiency standards.

Best Practices for Air Sealing

For the best results, air sealing should be considered from the very start of the building process. Here are some best practices:

  • Use High-Quality Materials: Opt for high-quality caulks, sealants, and weatherstripping to ensure long-lasting air sealing. Expanding foam can be used to fill larger gaps around windows, doors, and framing.

  • Focus on Airtightness in Insulation: While insulation slows heat transfer, it doesn’t stop air leaks. Pair insulation with effective air sealing to get the most energy-efficient results.

  • Test for Air Leaks: Once construction is complete, consider performing a blower door test to assess the home’s airtightness and pinpoint any areas where air sealing could be improved.

  • Incorporate Continuous Insulation: Structural insulated panels (SIPs) and other advanced framing techniques can help eliminate thermal bridging and ensure consistent air sealing throughout the home.


IR image showing air leak
Infrared image of an air leak

Conclusion

Air sealing may not be the most visible aspect of your new home, but it is one of the most important. By properly sealing your home during the construction phase, you can enjoy significant benefits, including reduced energy costs, enhanced comfort, improved indoor air quality, and long-term durability. Whether you're building a custom home or working with a contractor, make air sealing a top priority for a more efficient and sustainable living space.

By investing in air sealing now, you're not only creating a healthier and more comfortable environment for your family but also saving money and helping protect the planet for future generations.



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