Well, since looking on your site, I am definately changing my plans...but I really need to know the BEST way to have this flooring installed, on concrete, in Florida. I have yet to find a laminate or engineered flooring that I feel will be durable enough for the pricepoint, so, if I am going to do wood at all, I want a solid hardwood. Is it advisable to put down some kind of waterproofing product? Can I glue down the subfloor with the Bostic's glue that includes the moisture barrier? Someone also suggested putting roofing felt down between the plastic and subflooring layers, has anyone ever heard of this?
If you are set on putting 3/4" solid hardwood over the concrete the only method is to attach plywood to the entire surface of the concrete. Then use some roofing tar paper on top of the plywood and nail it down to the plywood. You do not want to glue 3/4".