without a steering wheel," explains Gary Osmond, of Henry Company Bakor.
Osmond, who is manager of building science and building envelope systems for the big air barrier manufacturer, says while air and air/vapour barriers have been in building codes since the 1980s, some are still poorly installed.
"Here we are a whole generation talking about sustainability and LEED and we still have trouble putting air barriers in buildings."
Key factors to consider in proper air barrier design include: seasonal exterior/interior temperatures; wall construction types, connections, deflection and building movement; cladding rainscreen systems; cladding anchors, ties and wall openings; and, insulation type and placement.
Today's large reputable architects often provide "near flawless" building envelope design specs, but some of their builders argue that they have been constructing buildings in one fashion for many years so why change, explains Osmond
It is not just owners, builders and designers that are the source of the problem, points out Osmond