On a tilt-up concrete job involving the construction of a 550,000-square-foot office building and warehouse in Tilton, N.H., contractor Clayco Construction, St. Louis, was required to place the tilt-up wall panels during the coldest time of year—November through January. Normally, Clayco casts tilt-up panels on the concrete floor of the building being erected. But in winter, Clayco takes a different approach, placing the panels on a temporary casting slab constructed below grade. For the Tilton job, Clayco went one step further and rented five E3000 Ground Heaters from a local supplier to turn the casting slab into a large radiant-heating pad that kept the wall panels warm during curing.