A Continuous Air Barrier refers to an uninterrupted layer or system of materials and components that is designed and installed to restrict the uncontrolled movement of air through the building envelope. It forms a continuous barrier against air leakage, enhancing the energy efficiency, indoor comfort, and indoor air quality of a building.
The key characteristic of a Continuous Air Barrier is its unbroken and seamless nature, covering the entire building envelope without interruptions. It is installed at various assemblies and components, such as walls, roofs, floors, windows, and doors, to create a comprehensive barrier against air infiltration and exfiltration.
The purpose of a Continuous Air Barrier is to minimize air leakage by sealing gaps, cracks, joints, and other potential air leakage pathways. It helps prevent the infiltration of outdoor air, which can carry pollutants, allergens, and moisture, while also preventing conditioned indoor air from escaping.
A well-designed and properly installed Continuous Air Barrier system typically includes a combination of air barrier materials, such as membranes, sheathing, tapes, sealants, and gaskets. These materials are selected based on their airtightness properties and compatibility with the building envelope assemblies.
The effectiveness of a Continuous Air Barrier depends on the quality of installation and attention to detail. Proper sealing of seams, joints, penetrations, and transitions is critical to ensure a continuous and airtight barrier. Regular inspections, quality control measures, and airtightness testing may be conducted to verify the performance of the Continuous Air Barrier system.
By implementing a Continuous Air Barrier, building owners and professionals can improve energy efficiency, reduce heating and cooling demands, minimise draughts and temperature variations, enhance indoor comfort, and promote better indoor air quality.