After a Flatiron Construction-Zachry Group joint venture struck out on all but one of its arbitrated claims against engineering firm partners on the I-85/385 design-build interchange project in Greenville, S.C., the contractors had one more source from which to try to cover unexpected project costs: a contractor protective professional policy. Flatiron-Zachry filed a lawsuit last October in San Antonio federal court to try to force payment from Steadfast, a subsidiary of Zurich American Insurance Co.