4040 Wilson Blvd., the final component to the Liberty Center Development, is a mixed-use building with retail, office and residential under one roof. This is the first project of its kind in the market, providing tenants the ultimate mixed-use environment in a single building, but at the same time allowing each division to operate completely independent of the others. This 22-floor tower features 187,000 square feet of office space, 37,000 square feet of retail, as well as residential apartments, including studio, junior, one and two bedroom floor plans. Apartment leasing began 2019. For this project team of building scientist installed an air barrier system. An air barrier is a system that’s designed and constructed to control air flow between a conditioned space and an unconditioned space. Air barrier systems solve common building environment problems by creating a seamless moisture barrier with no tears, holes or “mis-lapped” joints, effectively blocking air leakage, and reducing energy costs and the risk of condensation in the wall. Air barriers also protects sheathing and rough openings from weather damage during and after construction. Additionally, air barriers provide the opportunity for pressure-equalized or pressure-moderated wall design. This minimizes the risk of rainwater penetrating through any type of wall assembly.