What barrier(s) to use for an earthen subfloor against treated wood sill plate & pine bottom plate

I'm going to put in an earthen subfloor (basically road base with lime and clay slip) on top of perlite.  On the sides, there will be a vapor barrier that will gp over the cement block foundation and then over a treated wood sill and pine bottom plate.  Is the 6ml vapor barrier enough separation for the earthen floor from the wood sill and bottom plate?  I have rosin paper as well.  Do I need to add that in this application?  If yes, how so?
Thanks,
Dimitri

I think it's enough. I think it also important to have at least 3 inches of gravel under you road base to prevent water wicking up into your floor.

Thanks for your thoughts.  Yes, 3 ½ inches of gravel underneath.   Appreciate your response.