Baton Rouge-based national contractor Jasper Contractors Inc. is opening a material yard in St. Louis, a move that will create more than 100 jobs, according to the company.

The St. Louis office is Jasper’s 12 overall and third expansion this year.

Jasper, which specializes in roofing, heating and air conditioning, entered the Dallas/Fort Worth market in late April and also opened in Indianapolis this year. Jasper also has offices in Atlanta, New Orleans, Chicago, Cincinnati, Denver, Evansville, Ind.; Phoenix, and Salt Lake City. St. Louis expansion will be the 12th city and the third expansion in 2012 (Indianapolis).