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buffalobill

see:
http://www.buildingscience.com/resources/basements.htm

wrote:
I'm starting to finish my basement and I decided to put up polystyrene
against the cement basement walls and then stick frame 2x4 walls off of
that. My question is should the polystyrene be touching the floor or
should there be a slight gap between the polystrene and the floor?
Would a gap help if there was ever a drainage issue?

The answer to this and any other tip would be appreciated.

Thanks,
Mark