J.T. Thorpe & Son, Inc. (JTT) Recognizing the need for high quality production Pre-Cast refractory shapes, JTT has centralized a pre-cast shape operation in Maysville, Kentucky.   This facility, encompassing over 20,000 sq. ft. is designed to manufacture any shape required. A multitude of refractory mixes and proprietary refractory/needle blends are available to our customers to fit their individual needs.