Q. What is the driving force that lifts buildings, pipelines and roads into the air when the soil underneath freezes? A. Ask Clapeyron……A unifying theory is proposed, bringing together the CRRELL School of Duwayne Anderson and the CORNELL School of Bob Miller, leading to the definition of a Heave Index for the sensitivity of soils to exhibit frost heave. While traveling through the Northern parts of Idaho and Montana with my colleagues, Wilco van Loon (left) and Ed Perfect (right), we were warned about the hazards of freezing soil