Re: Basement Knee Wall Insulation
My builder says you shouldn't put poly on the walls in a basement.
I would have to disagree in part with that statement.
That's exactly the role of the vapor barrier ... to provide a barrier from warm moist air from contacting the cold zone and condensing.
The frost is evidence that moisture is present in the area behind the insulation .... which is the coldest point ... and freezing.
Some clarification is needed ...... how new is this construction?
The reason I ask how recent is the structure is ..... new lumber and concrete will expell moisture as it cures and dries. This could be as long as a year or so after construction. However ... if this new structure is immediately filled with insulation and covered over with a plastic vapor barrier this will trap that moisture from the new materials as they dry and cure .... and may prolong the time the moisture can be evacuated .
If it isn't recent construction then it's very possible the vapor barrier wasn't properly installed. It needs to be completely sealed and air tight as possible ... otherwise it's a waste of time and money ... also can cause more harm than good.
Just a thought.
"" an ounce of perception -- a pound of obscure "