Flynn Group of Companies is the leading trade contractor in North America that works on virtually every aspect of a building's outer layer, including Roofing, Glazing, Waterproofing, and Architectural Metals. Job Summary: Work collaboratively as part of a crew to waterproof and install commercial roofing systems, including fully‑adhered and mechanically fastened single‑ply membranes (TPO, EPDM, PVC, etc.).