Oculus led a team of consultants to complete a stack effect and exterior envelope study of the Thomas Eagleton Federal Courthouse to assess the potential infiltration due to air leakage and provide predicted pressure differences across the building envelope. Services included multiple on-site investigations; testing; visual inspections through drone technology and up-close visuals; THERM modeling; and building materials investigation through original submittals, drawings, and specifications. 8 individual solutions of varied scales were developed and presented to mitigate stack effect issues present at the Courthouse.