Re: vapor barrier
Condensation will occur when warm moist air contacts a cold surface.
So ... regardless if you were to paint the concrete walls with whatever type of paint or apply 6 mil plastic directly to the walls you would still have condensation.
In other words .... the vapor barrier is preventing the vapor from the inside space contacting the cold wall surface ...... not from the outside in.
The idea of the insulation is to raise the temperature of the wall surface preventing the warm moist inside air from reaching it's dew point and condensing.
There shouldn't be an issue with condensation if the basement wall is isolated from the warm air within the room.
You might consider attaching rigid foam insulation to the foundation walls first completetly covering the walls..... if you use 2 inch you are getting approx. R9.
When gluing the foam in place use a continuous bead along the 4 perimeter edges ........ use a construction adhesive that's compatible with foam ....... otherwise with the wrong type you may end up with a undesirable chemical reaction that will melt the foam.
In the corners you can use spray foam in a can to seal ... all butt seams use a house wrap tape to seal those joints to ensure the insulation is properly installed and well sealed to prevent warm moist air getting in behind the insulation.
Another area that is important to insulate will be the rim perimeter joist.
The closed cell rigid foam insulation has a low air and miosture perm. value which means it doesn't pass air and miosture very easily and is an acceptable vapor barrier.
There is no need to apply any additional vapor barrier with this method.
Then put up the wall framing in front of the foam and apply your drywall finish to the studs.
What you end up with is a continious thermo break behind the wall framing which is far superior to the interupted method of insulating each stud cavity.
Just a thought.
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