It’s difficult to determine how much air is entering a house through walls that are built, not only for shelter and support but also to prevent airflow as an energy conservation measure. However, several ASTM tests are available to accurately measure airflow through common walls to aid in determining problem areas and finding ways to abate...

According to Home Innovation Research Labs’ recent Builder Omnibus Survey, air sealing ranks number four among a list of 18 top challenges for builders in meeting current energy efficiency requirements for new homes. Roughly 10 percent of builders reported difficulties meeting new airtightness levels. With contractors playing a significant role in...