what tipe of wood should I use for floor joists on my basement is 24fts x 32 fts, but is on 2 levels 8 inchs different one from the other, I have RED HEAD WEDGE ANCHORS, how far a part should I put them? and I have 3 columns on the basement supporting the TGI for the upper level and i been trying to design a blue print with 3 bedrooms and a bathroom plus a L shape stairs, can you help me with all this ???