It was 1928 when William Treuhaft opened his small roofing materials manufacturing plant in Cleveland, Ohio, naming the company the Tremco Manufacturing Company. Today, Tremco is an RPM International, Inc. affiliate company employing over 500 people and a leader in the construction industry.

Tremco consists of operating divisions specializing in the manufacture of sealants and waterproofing products for multiple structures including office buildings, stadiums, parking garages, single- and multi-family homes, hospitals, high-rises and more.