Rigid form on floor and walls is to build an airtight layer between outside and inside. Indoor humid air does not hit cold concret surface to condense in summer. Winter indoor normally very dry for north region like canada. Humidity in concret or from ground, the form just block it away. in fact, VB is also just block humid away.
With the form, you will lose inches in height, but gain much comfortable, but costly. Mike Homle book recommended.
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