" May 10 (Bloomberg) -- A four-year slump in construction may be nearing an end, with the biggest U.S. building-material makers reporting higher monthly sales that have yet to spread industrywide.

Cemex SAB, the largest U.S. cement producer, and Vulcan Materials Co., the top gravel supplier, just reported monthly volume increases for March and April, their first since 2006. The results exceeded estimates and may lead the Portland Cement Association, a trade organization that represents U.S. and Canadian companies, to increase its growth forecast this year, said Ed Sullivan, its chief economist. "


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