Often we find busted concrete or slick steel plates at freezer door openings.  This occurs because the freezer slab contracts or shrinks as the moisture and heat is removed.  This shrinkage causes cracks in the concrete at the door ways.  Our president, W.L. (Butch) Edmonds Jr., designed and patented a heated, expandable joint that bonds to the cold and warm side of the concrete.  We use stainless steel rods and tubes to support the slabs from vertical deflection during forklift travel.  These Thermal Joints® have been in the field for over 10 years.