Casper built a number of stone buildings using the block-and-stackmethod. Some of his buildings are still in use, including the barn on theSteuber family farm and the Ballwig House. He built at least two churchesin the area: the Ragatz Church ‎(Salem United Methodist Church of HoneyCreek)‎ and St. Norbert's Catholic Church in Roxburry. That many of thebuildings constructed by Casper are still standing is testimony to thequality of his workmanship.