All Sure Safe EFS Foundations Are Individually engineered specifically for the manufacturer's model and site where the home is to be installed. Specifically designed to a number of variables, including length, width, height and configuration (footprint) of the home, roof pitch, height above grade. Engineered to meet specific loading conditions: dead loads, roof loads, floor loads, wind loads, both for lateral and uplift. Engineered to meet specific soil conditions for type, bearing capacity, resistance to sliding and pull out (when... read full review »