New LTTR Values and What They Mean for Roofing Industry Professionals Michael Cusick, Ph.D. Lance Wang, Ph.D. Christopher Griffin, Ph.D. February 7, 2014 3 Comments The ASTM C1289 Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board (ASTM C1289-13) was recently updated.Read More
