The concrete is at the ground level, and there is no drainage problem that I see.
Anyway, I talked to the wooden floor store about my problem. I also ask him to see is there is any better way to deal with it beside aplying vapor barrier, because my floor already has some kind of black mastic on it. I feel it will be tough to completely remove this thing and clean the concrete. He said that removing this black mastic and clean the floor completely clean is required. If I don't want to do that, than no point to apply vapor barrier because it won't bind to the concrete. The alternative is to get thick plastic sheet from Home Depot on the bottom. Good underlayment net, it has 2 layers, plastic sheet and rubber-like layer. Again, he said this is only the alternative if cleaning the floor is so tough.
Do you think having 2 underlayments underneath the laminate will be ok if I don't apply vapor barrier? Yes, my concrete has moiture problem.
Oracle,
a little more search at Home Depot side and I found this:
http://www.homedepot.com/h_d1/N-5yc1vZ1xhc/R-100069416/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
Is it what you prefered?
How do you install them? Do you nail it down, or glue it down?
After this dricore as subfloor, do you install any underlayment (plasic, foam, etc) or snapping the laminate right on the dricore subfloor?
Thanks.