I'm starting a new place, 20x32 full two story, I have three rows of 8x8 pilings in the ground so they are about 8' apart. I am using 4x12 fir beams running the 32' length and I'm trying to decide if I should use 9&1/2 or 11&7/8 bci's and on 16" or 24" centers. The bci's will be running the 20' length of course. Not worried about the price difference as the 11&7/8 are only $2.50 more but I don't want to haul the larger ones if they aren't necessary.
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