Lowes and Home Depot both sell thin 4x8 thin sheets of wall coverings that I think are made of plastic - looks like the same stuff used inside of chest freezers. I am considering using this with a textured finished for the walls. I initially thought I'd use that for the floor as well and then just put a heavy rubber mat, cut to size, on the floor. Don't know what its called specifically but it is a mat with a ton of holes drilled through it. I think Musthavbeer's idea of using EDPM (rubber roofing) for the floor surface might be a good one if I can find it. I'm going to investigate that this evening as well.
It is my understanding that a de-humidifier is really nothing more than the guts of an air conditioner. I talked with Mr. Malty (http://www.mrmalty.com/brewstuff.php) - he stated "The only downside is that you need to be a little careful at first that it doesn't ice up. Once you pull out the moisture, it is fine." This was my understanding as well - that the AC is going to be pulling moisture out when it runs.
It is my understanding that a de-humidifier is really nothing more than the guts of an air conditioner. I talked with Mr. Malty (http://www.mrmalty.com/brewstuff.php) - he stated "The only downside is that you need to be a little careful at first that it doesn't ice up. Once you pull out the moisture, it is fine." This was my understanding as well - that the AC is going to be pulling moisture out when it runs.