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Roofing Contractors The Vp of Northwestern Roofing Co. is Robert Marsteller Business classifications SIC (US 1987) : The National Roofing Contractors Association (NRCA) is one of the construction industry's most respected trade associations and the voice of roofing professionals and leading authority in the roofing industry for information, education, technology and advocacy. Founded in 1886, NRCA is a nonprofit association that represents all segments of the roofing industry, including contractors; manufacturers; distributors; architects; consultants; engineers; building owners; and county, city and state government agencies. NRCA's mission is to inform and assist the roofing industry, act as its principal advocate and help members in serving their customers. NRCA continually strives to enhance every aspect of the roofing industry. NRCA has more than 3, 500 members from all 50 states and 53 countries and is affiliated with 97 local, state, regional and international roofing contractor associations. NRCA contractor members range in size from companies with less than $1 million in annual sales volumes (50 percent of the current membership) to large, commercial contractors with annual sales volumes of more than $20 million. More than half perform both residential and commercial roofing work, and more than one-third have been in business for more than a quarter of a century.