Dan, another idea for you. Not sure if this will work or not, because I do not know how your basement is laid out. Get some engineered I-beams, lets say 4, or how many you would need to place them on 8 foot on centers, then run 2x8 between the I-beams. my in-laws used them on their addition, and they said they are light and strong, 2 people put them in place, and they can span 32 feet without any support. Get them about 1 or 2 inches less then the width of your basement, then they will rest on the floor by the walls, and you could put a peer in the center of some if you wanted. The ones I have heard about have places already to be knocked out for plumbing and such. Not sure what size you would need though, or the cost. Michael Being glad his basement wasn't this unlevel.
[Non-text portions of this message have been removed]
