Delta Gypsum of Wake Forest, N.C., announced today its purchase of United Materials of Charlotte, N.C. The move gives Delta its seventh store and means it now operates in the state's three biggest markets.

Today's move by the drywall specialty dealer follows its expansion to Winston-Salem, N.C., in late 2014 and to Fuquay-Varina, N.C., south of Raleigh in early 2015. United Materials is a single-store operation that has been in business since 2008. Its previous owners will remain in place.

"Adding the Charlotte market into our service platform that [already] includes Raleigh-Durham and the Triad areas positions Delta Gypsum to be in the three best markets in all of North Carolina," David Ritchie, a VP and partner in Delta, said in a statement. "With this move, we will have added a location into each of these key markets in the last two years.”