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Need help with Basement Wall/Insulation options

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  • Need help with Basement Wall/Insulation options

    am a recent first time homebuyer, after 7 months in this 5yr old construction, i have noted trouble in the basement with moisture on the foundation block wall at multiple spots. I have ripped out the existing insulation to figure out a solution for this. After having a couple of professionals look, i have decided to let one contractor drill weep holes in the block and place a viny covering upto 6inches onto the block wall and apply 2 coats of commercial grade waterproofing on the walls. The basement is equipped with sump pump, drain tiles and a floating slab.
    My dilemma is what to do once this work is done in regards to finishing my basement. Talking to different people meant i received contrasting solutons.
    1. Do i use a vapor barrier like plastic, before framing & insulation?
    2. What kind of insulation do i choose?
    3. Do i use Dry wall? is there any economical alternatives to dry wall in regards to wall options?
    4. In regards to flooring on basement, what is the recommended approach?

  • #2
    Vapor Barriers are needed.

    If vapor barrier is to be installed, and in any finishing project I feel it should be, it NEEDS to be connected to a closed-back interior drain system.

    The moisture won't be trapped if there is a drain to remove it from the basement. This vapor barrier can then protect the insulation from having moisture ruin the batting. R-9 to R-13 is code insulation to have. (Depends on state).

    The vapor barrier is essential in separating the basement environment from the outside environment that emanates through the concrete walls.

    Vapor Barrier + Drain THEN, 1-1.5" gap for air circulation, THEN metal studs with insulation, then a Moisture resistant wall board.


    By not installing a vapor barrier you leave yourself open to water leaks, air leaks, rod tie leaks, and other air cycle permeation that can bring with it moisture.

    Only 1% moisture content can render insulation 95% inefficient.

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