Air Leakage refers to the uncontrolled movement of air into or out of a building through gaps, cracks, openings, or other pathways in the building envelope. It is a common issue that can result in energy losses, reduced indoor comfort, compromised indoor air quality, and increased heating and cooling demands.
Air leakage occurs when outdoor air infiltrates into the building or when conditioned indoor air escapes to the outside. It can happen through various locations, including windows, doors, wall penetrations, joints between building components, electrical outlets, and poorly sealed ductwork.
The extent of air leakage in a building is influenced by factors such as building design, construction quality, materials used, and external weather conditions. The pressure differences between the inside and outside of the building, caused by factors like wind, stack effect, and mechanical ventilation systems, can also contribute to air leakage.
Air leakage can lead to a range of problems. It can result in draughts, uncomfortable temperature variations, and uneven heating or cooling throughout the building. It can also allow the infiltration of outdoor pollutants, allergens, moisture, and noise. Moreover, air leakage can increase energy consumption and utility costs as heating and cooling systems have to work harder to maintain desired indoor temperatures.
Addressing air leakage involves implementing effective air sealing measures. This may include using air barrier materials, such as membranes, tapes, sealants, and gaskets, to seal gaps and openings. Proper insulation, weatherstripping, and sealing around windows and doors are also important in reducing air leakage.
Air leakage can be assessed through various methods, including blower door tests and smoke tests, which help locate and quantify air leakage points. By identifying and mitigating air leakage, building owners and professionals can improve energy efficiency, indoor comfort, indoor air quality, and overall building performance.