Ilmanvuotiseen

Ilmanvuotiseen is a Finnish term that translates to "air leakage" or "air infiltration/exfiltration" in English. It refers to the unintended movement of air through a building's envelope. This can occur through cracks, gaps, or openings in the walls, roof, foundation, or around windows and doors. Understanding and controlling ilmanvuotiseen is crucial for several reasons related to building performance and occupant comfort.

Significant air leakage can lead to increased energy consumption as conditioned air escapes and unconditioned air enters. This can make heating and cooling systems work harder, resulting in higher utility bills. Furthermore, uncontrolled air movement can create drafts and uneven temperatures within a building, negatively impacting comfort. Infiltration of outdoor pollutants, moisture, and allergens can also occur, potentially compromising indoor air quality and leading to health issues.

Conversely, exfiltration, the outward flow of air, can draw in moist air from the outside, which can then condense within wall cavities or attics, leading to moisture damage, mold growth, and structural deterioration over time.

Building professionals often assess and mitigate ilmanvuotiseen through various methods. Building envelope sealing, the use of vapor barriers and air barriers, and proper installation of insulation are common techniques. Blower door tests are frequently employed to quantify the extent of air leakage in a building and identify problem areas. By minimizing unintended air movement, buildings can achieve better energy efficiency, improved comfort, and healthier indoor environments.