The main concerns are condensation and drying potential.
Plastic vapor barrier basement walls.
If water vapor diffuses or infiltrates into the wall cavity and finds the cool surface moisture problems can occur.
The material is stapled to the frame of a basement wall before it is finished with plaster or drywall.
Plastic on the outer surface of a wall in cold weather could cause problems.
The humid air is indoors.
This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings and it is required by building codes when insulating most houses.
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In any case the vapor barrier must point to the warm side.
Not to be confused with a vapor barrier which is placed on the warm side of the wall just in front of the insulation and behind the drywall a moisture barrier goes against the basement wall and.
When the mold grows it will spread to everything around it studs drywall etc.
If you have a framed wall that is adjacent to a concrete foundation wall where the vapor barrier is next to the drywall in front of the studs the fiberglass insulation gets wet and becomes a breeding ground for mold.
In very cold climates the use of polyethylene plastic vapor barriers between insulation and interior wallboard may be beneficial provided all air gaps into any wall and ceiling cavities are also blocked.
You should then use fiberglass insulation that has a vapor barrier between the studs with the vapor barrier facing in toward the living space.
The cool surface is the sheathing assuming no exterior insulation.
The standard installation of a plastic vapor barrier is between the studs and the drywall but there are some exceptions to this.
The construction of the wall for instance is vital to the use of a vapor barrier.
In exterior walls that are below grade like basement walls.
Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets.
In winter the dew point of the interior air is typically about 50 f assuming an air temperature of 70 f and a relative humidity of 50.
1 on the interior wall between the heated and unheated portion of the basement i would not use with a vapor barrier.