Several yaers ago we built a Sunroom on a concrete slab that was our patio. Recently I have notice the dirt is coming out from one side of the slab. What should I replace the dirt with? More dirt, concrete?? I have had a friend tell me to fill it up with foam filler but I don't know if that will be enough support.

Purchase ornamental concrete stones and after digging a footing use soil contact cement mix (not brick mortar)in the footing and place the stones along the slab with the tops even with the existing slab. Your original slab must not have been turned down along the edge and it needs a transion along the eroded area.