Demand for commercial roofing in North America is projected to increase by $480 million over the next three years from, 6 million square feet valued at $4.8 billion in 2011, to 6.6 million square feet valued at $5.3 billion in 2014.
Source: http://finance.yahoo.com/news/commercial-roofing-market-reach-5-120000306.html
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