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Condensation on inside – between XPS rigid foam and framing

daleyaj | Posted in General Questions on

in progress of finishing the basement. I am using 2” xps foam against solid poured concrete wall and taping the seams. I am also sealing the top of the concrete wall in a similar manner (xps, tape) and using foam board and spray foam in the rimjoist area. I am framing with 2×4’s (pressure treated for bottom plate) and then will install paperless wall board (no batt insulation in between). 

This is morning as I was continuing to frame I noticed some condensation forming on the seal tape at the bottom of the wall where it meets the floor. See attached pics). Should i be worried about this or be doing something different? Is it just that the inside air is cooler that the outside are and it should be resolved once i Sheetrock?  I am planning to use some sprayfoam (great stuff) in this small area small gaps between bottom plate and xps on the wall. Not sure if this will help or hurt?

to finish the floor I will put down a dimpled  plastic underlay produce and then use a thick vinal plank flooring.

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  1. Jon_R | | #1

    Sounds like you need to better control basement humidity (ie, measure it and run a dehumidifier).

  2. Expert Member
    BILL WICHERS | | #2

    I wouldn’t count on that tape to stay stuck to the concrete. Tapes don’t generally stick to masonry very well, especially for any extended period of time.


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