All buildings leak. Some leak a little, most leak a lot. Those that leak a lot create comfort and health problems for occupants, increased energy consumption and maintenance for building owners and managers.
More visible building leaks can be identified by a thorough visual inspection of the external and internal building envelope air barrier. However, it requires a more scientific approach to discovering the majority of air leaks. Blower door, tracer gas and thermal imaging technologies are the most proven and successful ways of assessing the integrity of a building envelope air barrier.