does anyone have a solution for finding the center grade beams under a slab house quickly and with a tool that doesnt cost more than a couple of thousand dollars. Also that is nondestructive. Ground penetrating radar systems start around twenty thousand which is too expensive. Usually one can guess where they should have been placed, but this is not always the case. A company called olsen makes a cement thickness tester that uses sound vibrations but will not work through the carpet or tile and various floorings. Does anyone have an idea how I might find them quickly while inside the house whith out using the plans? Thank You