" The room is built on the old patio"
is the patio and accompanying footing built to support walls....
This is a good question. I will have to check. I don't see why the previous owner would do such a thing, aside from being a moron.....Damn..... That may be the case. But the walls and roof over the room are not free standing and definitely have weight bearing beams in the walls. If I don't have a proper footing I'm screwed huh?