I would like to build some bearing walls on an existing 4″ slab. Assuming 3000psi concrete which is sitting on 3000psi sand, the loads would not be significant. But as I understand it, code specs a minimum of 6″, or is that just for a concentrated load such as a bearing post? If required for a wall, can I legally put down 2″ cement brick and then place the bottom plate? This of course would not be transferring the load over any greater area.
Thanks for any help!