Asphalt Roofing
Summary of changes
Activity on this program started: 1932
Reference period of change - January 2018
Target population - Beginning with reference period of January 2018, the survey of asphalt roofing products is based on the North American Product Classification System, 2017 variant 1.0
Reference period of change - June 2008
As of July 17, 2008, this survey is now voluntary.
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