I think i need about 6-8 in the basement. Would 2 x(2x6') screwed/glued together be just as good? I would put plastic at the base. What i've discover is some crumbing around the concrete of the main support beam in the basement. One of the steel supports is tilting a bit. I think i should put a supports underneath, at least one on each end and under some of the floor spots. What i've done now is sprayed the gap fill foam in the cracks which seemed to work well. I don't like that jack posts they are expensive and hard to jack up. What about concrete blocks? I like the 2x6's because i can hammer in there by making it 1/8" higher. I was thinking using stacks of cinder blocks then a car jack, then slide some bricks and wood underneath? I don't think i should try to jack up the house too much though. The bathroom and tub are sitting right above it as well as the stair case, it might cause cracking? I wonder if it was the weight of the staircase and bathroom that caused too much weight on the foundation wall? I guess that would make sense. Basically the main floor reminds me of skate board park as it is now. There are some odd shaped joysts down there too. Probably wouldn't get too much worse better to at least stop it from moving.