Gypsum Systems, Inc. (GSI) is one of the largest merit shop construction companies in Western New York. We specialize in commercial wall work, ceiling work, and plastering subcontracting, as well as architectural millwork through our AWI-certified subsidiary, Conley Caseworks. With a team of 14 individuals in the office and more than 170 in the field, including experienced carpenters, plasterers, and drywall finishers. GSI can complete the most demanding and complicated projects on time and within budget. Our clients include general contractors, development companies, and business owners in New York, Connecticut, New Jersey, and Pennsylvania.