Yeah, it Has to have a vapor barrier behind it, even when installed correctly......crazy that someone would put it up without it.

After the third time he asked me I told him the answer didn't change since the last two times he asked me and that this information was listed in the listing, but he doesn't seem to have the intellect to function normally so I was going to pass on him...Just now I had a dozen low income geniuses hound me because when I posted about my friends wife's abrasive behavior, calling me a loser at the table (she makes $13 an hour at 39...) and how I thought it was funny since I'm a millionaire and pay more in taxes than both of them combined gross in a year, the idiots on reddit attacked me saying I'm pretentious and a douche...1) I don't think they know what the word pretentious means, since it's pretending to have more than you have and I actually do have what I say I have 2) I found it funny that despite my friends wife calling me a loser despite it actually being the other way around, her being a loser and me being a success, I was considered the bad guy by the low income reddit morons....98% of the world is filled with idiots...

Another misconception is that vapor simply vanishes into thin air without leaving a residue.  

A classic..I guest lecture at the University of Nebraska-Lincoln College of Business and require students to read this book for the class.You can Negotiate Anything by Herb Cohen.http://www.amazon.com/You-Can-Negotiate-Anything-Negotiator/dp/0553281097/ref=sr_1_1?

I used to get calls all the time to convert a garage to living space and usually it was not allowed, unless the original garage was torn down.Garages are not built to be used as living space and therefore often do not have a vapor barrier in the slab, or the correct rebar, or concrete PSI.So your first step is to go to the City where this is located and ask them if you can do it.

Turns out the water that was leaking was all turning to vapor.

Concrete is the easy part.  2 x 2 spacing with 1/2 inch rod; 6 inches thick walls/sides; vapor barrier as needed.   

By building the floor up you can resolve the vapor barrier that’s required.  

My "velvet glove" approach would be to light-heartedly tell them it's getting too loud outside and it is time to buy a vaporizer.