I am in the process of restoring an old Dutch style barn. The barn is framed with 8"x8" posts and timbers. The original sill was 8"x8" as well. I have the outside walls raised on cribbing and want to pour a foundation under it. I have already poured a good 8"x 24" footing on hardpan soil. What I am trying to determine is whether I should just pour standard 8" walls and have a 2"x8" mud sill or should I have 8" walls with 12" boxed concrete sections for the posts?

I have seen it different ways in different photos but it seems that the pillar style foundation would be stronger.

Any other comments and suggestions appreciated.