Airsealed

Airsealed is a term used to describe a building or enclosure that has been designed and constructed to minimize uncontrolled air leakage. This is achieved through a continuous air barrier system, which prevents conditioned indoor air from escaping and unconditioned outdoor air from entering. Proper air sealing is a crucial component of energy-efficient building practices.

The benefits of an airsealed building include reduced energy consumption for heating and cooling, improved indoor air quality due to controlled ventilation, enhanced comfort by eliminating drafts, and better moisture control, which can prevent mold and structural damage. Air sealing is typically accomplished by carefully detailing and installing materials such as sheathing, membranes, tapes, and sealants at all joints, penetrations, and transitions in the building envelope.

Common areas where air leakage occurs include around windows and doors, electrical outlets and switches, plumbing penetrations, attic hatches, and where different building materials meet. Professional air sealing often involves blower door testing to quantify the level of air leakage and identify specific problem areas. In many regions, building codes now include requirements for air tightness, reflecting the importance of this practice for both environmental and economic reasons.