I just wanted to keep you informed of some developments that have happened throughout the US with regards to air barriers. There has been continuous work to try and promote air barrier usage throughout the country, and it seems that this has been successful. It has recently been finalized that air barriers are now included in the new ASHRAE 90.1 – 2010: Energy Standard for Buildings Except Low Rise Buildings. This is a standard that is referenced in several codes and documents, and before this revision, had not included any requirements for air barriers. The previous version of this standard…