CEDAR RAPIDS — An Iowa insulation and construction supply company is expanding in Cedar Rapids.Kinzler Construction Services, which has its headquarters in Ames, opened shop in a 14,000-square-foot facility with a recent office expansion at 6415 Sixth St. SW on July 1. The firm expects to add 50 jobs over the next few years, said Craig Coder, general manager of the Cedar Rapids branch.“With a location in Cedar Rapids we can service the whole southeastern part of the state,” Coder said.Kinzler, which has been around for 32 years, has 250 employees and locations in Ames, Ankeny and Waterloo, Coder said.