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长期以来,美国屋面工程协会(NRCA)定期进行市场调查,旨在为屋面专业人士提供有关屋面市场的基本情况和发展趋势等方面的信息。最近出版的《Professional Roofing》刊登了关于2012—2013年度NRCA市场调查的文章,涉及屋面市场销售、屋面施工、材料应用以及各类屋面系统等。市场调查采用问卷的方式。NRCA于2011年底总共向大约2 900个会员屋面承包商单位发放了问卷,有来自全美10个地区的160个单位响应,回收率
The National Roofing Association (NRCA) has regularly conducted market surveys to provide roofing professionals with basic information and trends on the roofing market. The recently published Professional Roofing publishes articles on the 2012-2013 NRCA market survey covering roofing market sales, roofing, materials applications, and various types of roofing systems. Market survey using the questionnaire. The NRCA distributed a total of about 2 900 member roofing contractor units by the end of 2011 with a questionnaire from 160 units in 10 locations across the United States. The recovery rate