Our history
In 1971, Founder Raymond (Ray) Theisen, established his roofing business after branching out from working with his father, Mr. Harry M. Theisen, who at the time owned Malcor Roofing Company in Aurora, Il. Ray, along with several of his brothers, worked under Harry who became a partner of Mr. G. C. Malcor’s Roofing company in 1929.
Ray’s new venture started off as a solo job, relying upon a used pickup truck and his hand tools. In the early days, a shop was set up in roughly 1,000 sf. of warehouse space on the East end of Lincoln Hwy., in Dekalb. A decade later, Ray purchased a larger, more permanent location on Pleasant St. which served as the iconic office & warehouse for Theisen Roofing for roughly 3 decades. With business continuing to expand Theisen Roofing again moved in 2016 and is now located in Cortland, where their 20,000 sf. facility allows them the ability to keep growing.
For over 50 years, Theisen Roofing has been a household name in Dekalb and surrounding communities. Known for their quality craftsmanship in residential roofing, siding and seamless gutters, the 3rd generation company is still running strong in offering the highest quality products the industry offers, with impeccable service. Today, Theisen Roofing is still family owned and operated under the leadership of Ray’s sons Jeff (who joined the company in 1978) & Brian (who joined the company in 1989), along with Ray’s youngest grandson Eric who has been with the company since 2010.
