I have the epdm which is why I wanted to use it but it is not a must use. The xypex looks interesting but I would still need to insulate the walls somehow. The roxul looks like a good product as well, however with all the steps and materials recommended I would make a good guess that the price would be out of range. Maybe I just have to do like Rob Roy did and put on a tar based product and imbedded 6 mil plastic in it, and then put foam board over that. Simple, inexpensive, but messy. These days he uses bituthene adhesive sheets and adheres them directly to the concrete. A good option to, very similar to the epdm I already have though. Honestly don't know which route to go. Have researched so many different options my head is spinning. Like most people on here building the houses we are budget is a big concern. If it wasn't i would just hire someone and be done with it. We do plan to put a dehumidifier in the crawl space to use as needed, but hope do minimize use by controlling moisture other ways.