Research has shown that in the typical home air leakage constitutes 10-30% of the energy used for heating and cooling. Air leakage is driven by outside temperature and wind and is therefore uncontrollable. This results in wasted energy and a drafty, uncomfortable home. It can also lead to condensation and deterioration of roof decking when moist indoor air leaks into the attic. Much of the outdoor air entering a building through passive infiltration often includes pollutants from the crawl space, attic or garage. Energy savings, improved comfort, structural preservation and better indoor air quality can be achieved by sealing leaks in the building envelope and replacing passive infiltration with controlled mechanical ventilation.

Graph of infiltration sources	Unsealed light fixture	Typical Air Leak Points

Through the use of pressure induction equipment and precision gauges, atmosphere, Inc. is able to measure the amount of air leakage in a building and locate its sources. This, along with the development of highly effective movable and permanent sealing materials, has made it possible to address this problem and establish a much more controlled building envelope. Much of this work is done from the crawl space and attic, sealing joints between building materials, plumbing and electrical penetrations, chimney chases and dropped ceilings.

Blower door diagnostics

Sealed pipes and electrical wires

We will generally recommend installation of an advanced whole-house ventilation system to control fresh air needs. This service not only improves comfort and air quality, but has the added benefit of paying for itself over time through energy savings.

Additional Reading and Links: Air Leakage Control Guidelines - Techincal data on Air Leakage Limits

Bob Vila endorses "Air-sealing and the Thermal Boundary" "Good air-sealing where the ceiling meets the attic is important not only to save energy and reduce fuel bills, but also to prevent moisture problems and even help reduce radon entry..." Read the full article here

Energy Star - Air Sealing Information and Resources