Basement insulation

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You need a vapor RETARDER.

But people often think that only means sheet plastic and it has many problems in a basement.

Seal sheet foam is both a vapor retarder and also insulation so that any interior moist air is keept warm.

http://www.buildingscienceconsulting.com/resources/foundations/renovating_your_basement.pdf

This is a basic 1-2-3 instruction.

http://www.buildingscienceconsulting.com/resources/foundations/Basement_Insulation_Systems-2002.pdf
This give the whys and options.