The Boro is among the newest multi-cultural communities to come to Tysons Corner, Virginia.  It contains retail, residential, and commercial office space.  It took nearly three years to build the 3.5 million square foot community. The first phase of construction began on the Boro in 2016 and costed approximately $800 million dollars to build.  In fact, there are over 1,500 apartment and condominium units available at the Boro.  The retail space at the Boro also includes a Whole Foods Market for residents living in the area to do their grocery shopping. For this project team of building scientist installed an air barrier system.  An air barrier is a  system that’s actually 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.