Photo Courtesy of Sunlink Corp. The 20-ft by 20-ft shake table at PEER is the largest multidirectional shaking table in the U.S. For the first time, a solar racking manufacturer tested its ballast-only roof-mounted racking system on U.C. Berkeley's Pacific Earthquake Engineering Research Center (PEER) shaking table in Richmond, Calif., and it appears to have passed with flying colors.The March 5 test "provided us with information on how our roof mounting system acted [when] not connected to a roof," said Mike Williams, senior vice president-engineering for SunLink, San Rafael, Calif. The product "acted like we thought it would," he added.SunLink
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.