The R.W. Mulligan Company has long been the premier roofing and siding company serving Eastern Long Island. As a GAF Master Elite Roofing Contractor and GAF Master Commercial Roofing Contractor we are fully qualified to install all types of steep slope roof and low slope roof systems. Our craftsmen are specialists in EPDM roofing and siding, Cedar shingle and shakes for both roofing and sidewall applications, asphalt shingles, slate roofs, vinyl siding, window and door systems and custom metal work including copper and seamless gutters. We stand behind our work by offering the industry's most comprehensive warranties on Long Island, or anywhere. Whether it is a private residence roofing job, a commercial or industrial building or even an entire shopping center, we have the expertise to handle the job and we have the credentials to prove it.