We recently had a basement dug for an RTM and a pad poured for a shop and contractor cut some major corners. The pad for our garrage (32'x48') was a 4" thick slab with no thickened edge. On this sits 12" walls on 2"x6"s. Now that it is all said and done, what is the best remedy that I can have done in the spring time to strengthen up this structure. I was told that all I can do now is wait until spring and dig a 18" x 18" trench around the edge of the building that will lip about 3 inches under the slab, line with rebar and pour a new edge. Is this the best way to save the pad? In the basement there were no footings under the 3 teleposts. Instead there is a 2" thick 18"x18" cement block that the Telepost is sitting on under the slab. The ground is a rock hard packed sand in the area which is why I think he felt that it could be shortcutted on. With the weight of the house on 3 of these teleposts on the cement block do you think that by adding a center wall (with 12" centers)down the center of the house, that we will be able to offset potential settling enough?