Greater use of building information modeling is among the factors that "should show a positive claim trend" for contractors professional liability insurance, says Martin Andrejko of Zurich North America. The sector, however, faces the threat of unexpected problems, such as those with Chinese drywall, he said. For example, it may be discovered that a green product "breaks down much too quickly, or causes environmental issues," Andrejko said. "There's always those black swans that are out there, and we address them when they come and try to go on from there," he said.