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Building Homes Enriching Communities Changing Lives The National Association of Home Builders represents the largest network of craftsmen innovators and problem solvers dedicated to building and enriching communities. Tariffs and Trade Policy In Win for NAHB Canadian Lumber Exempt from Trumps Reciprocal Tariffs President Trump on April 2 announced tariff exceptions for Canada and Mexico which is significant for the home building industry as Canada accounts for roughly 85 of all U. S. softwood lumber imports and nearly a quarter of the available supply in the U.