A Roofing Subcontractor works for a general Contractor on a construction or roof repair job. As a Roofing Subcontractor, you specialize in the installation and repair of roofs for residential and commercial buildings and outbuildings. Depending on the scope of the job, you may work alone or you may hire a crew of workers to assist you. Each roofing job brings unique needs, so sometimes you may install a new roof on an existing building, install a roof on new construction, replace missing or damaged shingles, or repair minor roof damage.