COLLIS ROOFING is also a commercial and industrial roofing contractor that specializes in commercial and industrial roofing solutions. As a commercial roofing company, we offer a variety of quality roofing services. Behind every service, whether it is re-roofing, steel roof restoration or our Preventative Roof Maintenance Program , our commitment is to provide excellence in commercial roofing solutions. Here are some of the commercial roofing services we provide: , Re-roofing