Õhutõmbekindlust

Õhutõmbekindlust refers to the ability of a building or a specific part of it to resist uncontrolled air leakage. This is a crucial aspect of building physics and energy efficiency. In simpler terms, it measures how well a building's envelope prevents air from passing through it, both in and out. Proper õhutõmbekindlust is important for maintaining comfortable indoor temperatures, preventing moisture problems, and reducing energy consumption for heating and cooling.

Air leakage can occur through various pathways, including cracks in the building envelope, around windows and doors, and through penetrations for pipes and electrical wiring. Excessive air leakage can lead to drafts, which reduce comfort and increase heating costs. It can also carry moisture into the building structure, potentially causing mold growth and material degradation.

Assessing õhutõmbekindlust is typically done through a blower door test. This test depressurizes or pressurizes the building and measures the rate of airflow required to maintain that pressure difference. The results are often expressed as air changes per hour (ACH) at a specific pressure. Building codes and standards often set minimum requirements for õhutõmbekindlust to ensure energy efficiency and occupant comfort. Improving õhutõmbekindlust involves sealing air leaks with appropriate materials such as tapes, membranes, and sealants.