Profile: Roy Wahlstrom & Co. is a retailer of windows and doors. Our brands include Winstrom™, Great Lakes™, SugarCreek™, Precision™ and Marvin™. Our products include vinyl replacement windows, marvin windows, steel entry doors, fiberglass entry doors, aluminum storm doors, aluminum storm windows, aluminum awnings, custom window screens, porch screens and enclosures. We also provide a variety of services including screen and glass repair.