Construction on my garage and addition is underway, but I am a concerned about the slab. The back of the garage will be attached to house, which the contractors put in a footer 42" below and stacked block on it...the floor joist will sit on top of the block for that room. The garage on the other hand, they did not put in footers 42" deep. They had dug out the sides , but I don't know if this is normal. The slab is 8" thick, fiberglass reinforced. Should I be concerned? Here are some pics on the progress.