The single hip roof is supported by braces on either side of every rafter in a style promoted by the University of Illinois' Agricultural Experiment Station. The roof is covered in wooden shingles and capped by a small metal ventilator. The roof design and construction, by the Haas Brothers, connects it closely with round barns found in Stephenson County, Illinois that feature Haas Brothers construction. The Weber Barn was the last in the Stephenson County area that the Haas Brothers worked on. The Weber Round Barn does differ from the barns in neighboring Stephenson County in its vitrified tile wall. This type of tile wall demonstrates an important period in the evolution of round barn design. Vitrified tile was preferred by builders during the final period of American round barn construction.