ilmatiiveystarkastukset

Ilmatiiveystarkastukset, often translated as airtightness testing or blower door testing, are a common practice in building diagnostics. The primary purpose of these tests is to measure how airtight a building is. This is crucial for a variety of reasons related to energy efficiency, indoor air quality, and occupant comfort.

The testing process typically involves using a specialized fan, often referred to as a blower door, which is mounted into an exterior doorway. This fan is used to either depressurize or pressurize the building. By carefully controlling the fan speed, a consistent pressure difference is created between the inside and outside of the building. During this process, any air leaks, also known as infiltration, become apparent. These leaks can occur through cracks, gaps, or openings in the building envelope, such as around windows, doors, electrical outlets, plumbing penetrations, and attic hatches.

The results of an ilmatiiveystarkastus are typically expressed as a numerical value representing the rate of air leakage. This can be measured in various units, such as air changes per hour (ACH) at a specific pressure or as a specific airflow rate per unit of building area. Building codes and energy efficiency standards often set maximum allowable air leakage rates. By identifying and quantifying these leaks, builders and homeowners can take steps to improve the building's performance. Addressing air leakage can lead to significant energy savings by reducing the amount of heated or cooled air that escapes the building, as well as preventing unwanted drafts and improving the effectiveness of insulation. Furthermore, proper airtightness is essential for controlling moisture movement within the building structure, which helps prevent mold and mildew growth.