Jason Bondurant deals with forensic investigations, problems with existing buildings. The main purpose of Due Diligence of the Building Envelope is to assess the condition of the building envelope at a property, to identify any deficiencies which might require repair or replacement. The building envelope refers to the exterior skin of the building, the exterior wall systems which might be brick or stucco glazing systems like storefronts, curtain walls, sliding glass doors, waterproofing systems on balconies or plaza decks, and the roofing systems on the roof of the building.