Check out these helpful instructional videos on airtightness and air leakage testing. Made in Australia, the general observations about lack of awareness of the importance of airtightness apply here too.
This series of three short videos (less than seven minutes each) is produced by Efficiency Matrix, a supplier of products and testings for airtightness. The first video is absolutely worth watching by home owners as well as construction and design professionals.
—19 April 2020