Established in 1960, Korellis is a self-performing building envelope contractor specializing in roofing, sheet metal, wall panels, and masonry. But being in business for over 60 years is only a small part of our overall experience. Korellis has installed millions of square feet of roofing and sheet metal systems. Under difficult conditions, often on projects with structural deck replacements, severe slopes, and poor logistics, work has been completed cost effectively and safely, while at the same time achieving some of the highest honors in our various industries. We are recognized as the premier roofing contractor in Northwest Indiana, and one the biggest in Chicagoland. We have worked at some of the largest steel mills and industrial locations in North America, as well as hundreds of churches, schools, government and office buildings, nuclear power plants and multi-million dollar casinos. We’ve completed projects with a wide variety of shapes, sizes and slopes and established safe en