Leveling floor, overlapping existing drywall

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May 13, 2018
I stupidly framed out my basement and put up drywall, which looks great. I then realized that I should level the floor - it drops 3-4" over 12' and it isn't flat, either. I want to use concrete to level the floor so that I have more flooring options. My drywall ends ~1" off of the floor so that it doesn't wick water and I have a membrane under the sill piece. Leveling the floor would place the level of the concrete high enough to overlap and contact the bottom 2-3" of drywall.

If I have 2-3" of concrete against the drywall, I will need a moisture barrier. What can I place on the bottom of the wall to stop moisture from wicking into the drywall? Or do I rip off the bottom of the wall? If I rip the bottom off of the wall, do I need to do anything to support the bottom of the drywall - it seems that it would crack. Or do I tear down my new wall and level the floor underneath it? :(

The basement has an interior French drain and there is a floor drain in an adjacent room. Plastic over the floor shows moisture due to a high water table, but there has never been water in the sump for the French drain.


Supporting Member
Supporting Member
Mar 6, 2011
That sounds good. Cut the CBU so it's 1/2" or so higher than you need it. Self levleing concretes will flow through small voids. So if you plan to use a self leveling product, be sure the corners and edges of everything are sealed and caulked well.......... as if it's a swimming pool.

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