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[Gene GeRue <genegerue AT ruralize.com>]

> I don't think so, but I'll check. I don't think that it is done in this
> area. But it still seems like a good idea to me.

A plastic vapor barrier is a good idea in any climate. Consider that there 
might be underground plumbing leaks in the future.

I have zero experience with mobile homes but if I were installing one I 
would have a vapor barrier installed first, then covered with several 
inches of sand, then put the interior support piers on top of that. It is 
very difficult to seal a vapor barrier around interior supports.

Also consult with local builders and see if it makes sense to install vents 
in your brick wall when you build it.