Attendees of the U.S. Open in New York City will be sheltered by a new roof addition designed by Rossetti with structural engineer WSP/Parsons Brinckerhoff. But, David W. Dunlap writes in The New York Times, the Rossetti-designed stadium was not intended to support a roof, and the addition is not actually a roof: "What has been constructed at the Billie Jean King National Tennis Center in Queens is a free-standing pavilion rising 125 feet over the sidewalk, on eight steel supercolumns and 16 great angle braces. They support a gently domical, 80-foot-high, 4.4-acre expanse of translucent, milky-white fabric membrane covered in polytetrafluoroethylene — Teflon, by any other name — with two 500-ton panels that can open or close over a 250-by-250-foot opening to the sky." This new stadium covering can be retracted in about seven minutes, and contains a system to handle condensation. Read the complete article at The New York Times.