Cob: Stone foundation question

[laythss]

  Hello all,
 I have a question that has been long bothering me, and I still have not
understood it completely. It is regarding a stone foundation for a cob
building. If the stone foundation goes a foot above the ground, then doesn't
that give way to air drafts, especially cold air coming from outside through
the rock foundation? Can someone help me regarding this. Or can someone
correct me if I misunderstood something about stone foundations. Thanks

Layth