Tiiveystestauksen

Tiiveystestaus, meaning "tightness testing" in Finnish, refers to a process used to evaluate the air-tightness of a building envelope. This testing is crucial for energy efficiency, indoor air quality, and occupant comfort. By measuring how much uncontrolled air infiltration or exfiltration occurs through the building's shell, tiiveystestaus helps identify areas where insulation might be inadequate or where there are gaps and cracks.

The most common method for performing tiiveystestaus is the blower door test. In this test, a powerful fan is mounted into an exterior doorway, creating a controlled pressure difference between the inside and outside of the building. This pressure difference forces air through any leaks in the building envelope. Sensitive instruments then measure the airflow rate required to maintain this pressure difference. The results are typically expressed as an air change rate per hour (ACH) at a specified pressure, or as an air leakage area.

High levels of air leakage, as revealed by tiiveystestaus, can lead to significant heat loss in colder climates and heat gain in warmer climates, increasing energy consumption for heating and cooling. Furthermore, uncontrolled air movement can carry moisture, potentially leading to condensation and mold growth within building structures. It can also compromise the effectiveness of ventilation systems, leading to poor indoor air quality and the presence of pollutants.

The results of tiiveystestaus are valuable for builders, architects, and homeowners. They can pinpoint specific locations of air leaks, allowing for targeted repairs and improvements. This can include sealing cracks around windows and doors, penetrations for pipes and wires, and joints between different building materials. By improving the air-tightness of a building through effective tiiveystestaus and subsequent remedial actions, significant energy savings, enhanced comfort, and a healthier indoor environment can be achieved.