Their primary service is to install the shingles, also known as sheaves, over your existing roof. Then they will install all of the necessary components to finish the job, such as the sheaves, underlayment, gussets, fascia, sealer. The installation of the roofing contractors New York can be done fast so you don't have to wait for them to finish installing the roofing before starting on your project. The gutter systems, attic ventilation systems, and other components can be installed with ease by using the same trained professionals.