Why is there frost build up on basement walls? (poured concrete)

William Hackett
Updated: April 7, 2022

Recently (spring time) noticed the carpet in my finished basement was wet.  I removed the drywall, plastic vapour barrier and pink insulation and noticed a huge amount of frost build up in the corner of my poured concrete wall.  House is approximately 70 years old and live in central Canada (Winnipeg) where it gets to minus 30 celcius in the winter.  Never have moisture problems in the summer.  What is the proper way to insulate and finish the walls to prevent frost build up from reoccuring?  Do I need the plastic vapour barrier, getting mixed recommendations from different contractors.  Thanks.

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