õhutõkkemembraane

õhutõkkemembraane are materials used in building construction to prevent uncontrolled air leakage through the building envelope. Their primary function is to create a continuous barrier against air movement, which can significantly impact a building's energy efficiency and indoor air quality. Air leakage can lead to heat loss in winter and heat gain in summer, increasing heating and cooling costs. It can also carry moisture into wall cavities, potentially causing condensation, mold growth, and structural damage.

These membranes are typically installed on the interior side of the insulation in exterior walls, or on the warm side of the insulation in roofs and floors, depending on the climate. They are designed to be airtight but usually permeable to water vapor, allowing any trapped moisture to escape outwards. This is a crucial distinction from vapor barriers, which are specifically designed to block moisture vapor.

Various materials can function as air barriers, including specialized membranes made of synthetic materials, but also traditional building materials like well-sealed gypsum board or even carefully detailed brickwork. Proper installation is critical for the effectiveness of an air barrier. Joints between membranes, penetrations for pipes and wires, and connections to other building elements must be meticulously sealed using tapes, sealants, or gaskets. A well-executed air barrier system contributes to a more comfortable, durable, and energy-efficient building.