I've had guys come out to bid on installing a "Cleanspace" vapor barrier in my crawlspace, but the cost is prohibitive for me ($8-15k). I think a 20-mil plastic would be just as good? If so, is there a type of contractor I can call that would do this for me? I'd like it done right, and done right the first time, so I'd like to find someone that does this sort of thing often, I just don't know where to look. Any suggestions? I know I could probably do it myself but my time and health doesn't permit it at this point...thanks.