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Can I add more insulation over a vapor barrier if I don’t add more vapor barrier?

loosegoose | Posted in General Questions on

New condo, basement insulated from ceiling to floor with insulation wrap and vapor barrier. I have erected stud walls and want to know if I can add insulation in the studs if I don’t add any more vapor barrier.

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  1. GBA Editor
    Martin Holladay | | #1

    I'm not familiar with the term "insulation wrap." I'm guessing that you are talking about vinyl-wrapped fiberglass insulation blankets -- sort of like a pillow. Is that what you have?

    By the way, it's always a good idea to tell us your geographical location or your climate zone, to help us answer your question.

    The correct answer is that you don't want any fiberglass insulation near your concrete wall, with or without a vinyl jacket. You need to remove the existing insulation and install rigid foam or closed-cell spray foam. Here is a link to an article that provides the information you need: How to Insulate a Basement Wall.

  2. loosegoose | | #2

    Yes, you are right. It is a vinyl-wrapped fibreglass insulation blanket. Wasn't sure of the proper name. I am in southwestern Ontario Canada.

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