I'm in the process of building a theater in my basement but after performing the taped plastic to the floor test and seeing moisture develop, Im down to essentially one solution. I have a sidewalk about 4 feet from my house that is tilting towards the property and causing water to collect near the house. I'd like to mudjack to get it level and install a french drain however I live in a townhouse and dealing with the association is a hassle. My last option is to install a radon fan to see if it will dry out the slab. I recently drilled a few holes in the slab to see what was going on. One area ( a dry spot in the concrete) I dug up had a moisture barrier under the slab but in one of the "dark" concrete areas I dug up there was no moisture barrier. Any suggestions?