Commercial Roofing Service Technician Summary : You will be responsible for investigating, locating and repairing leaks and defects in the following commercial roofing systems EPDM, PVC, TPO, Built-up Roofing and low slope metal. Commercial Roofing Service Technician Responsibilities: Install and repair roofs with the use of commercial roofing systems including BUR, Modified Bitumen(torch applied), TPO, EPDM, PVC.