Commercial Wall Solutions

What is the primary function of an air and water-resistive barrier (AWB) in commercial wall assemblies?

An AWB minimizes unwanted air and water intrusion through the building enclosure, helping to protect the structure from environmental factors like rain, snow, and wind. It helps enhance durability and energy efficiency in building performance.

How does air leakage (infiltration, exfiltration, and intrusion) impact a building’s performance and durability?

Air leakage can introduce moisture into the building enclosure, potentially leading to condensation, mold growth, and structural degradation. Additionally, uncontrolled air movement compromises energy efficiency by increasing heating and cooling loads, and raising operational costs.

How do transition areas (roof-to-wall, wall-to-foundation, penetrations) impact the effectiveness of an air and water-resistive barrier?

Transition areas are critical points where air and water leakage can occur if not properly detailed, sealed, and integrated with other components. Effective AWB installation in these areas involves continuous, overlapping layers with properly designed flashing and sealants to maintain a fully enclosed barrier.

What’s the difference between self-adhered and liquid-applied barriers?

Siplast offers air and water-resistive barriers in two core material types: self-adhered sheets and fluid applied membranes. Both offer significant advantages over mechanically attached membranes and can be used on the same project to employ the unique advantages of each type. As an example, self-adhered sheet membranes are often applied to long, opaque sections of a wall assembly, while fluid-applied membranes are ideal for the more difficult-to-cover areas such as curved surfaces, openings or corners – including areas of the building with complex geometries.

What’s the difference between permeable and impermeable air barriers?

Choosing between permeable and impermeable air barriers requires a careful examination of a building’s location, its intended use, and the level of exposure to certain weather conditions. For example, a commercial building located in a humid climate may require a vapor-permeable air barrier to allow moisture trapped within the walls to escape in order to prevent damage. Conversely, a building wall design with primarily continuous exterior insulation may be better suited to an impermeable barrier behind the insulation.