Its in a concrete foundation. The wood floor sits on top of 2x4's in a recess in the foundation. There will be 3.5 inches of clearance between the concrete and the bottom of the finished floor.

I was thinking about installing the floor boxes like I normally would (Just placing them in the concrete of the foundation, but i'm not sure if the boxes will be tall enough to reach the finished floor.

My other idea was to place conduit where it will be accessible in the recess once the foundation is poured, then pipe over to the boxes which I would mount directly on top of the concrete.

I would really like to hear everyone's opinion on this.

Stan