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Of course, if the current floor does have insulation under it, you could just pour the new, lightweight concrete over the original slab. The older concrete would act as thermal mass for the new ...
Another consideration is head height. If the finished basement ceiling will be less than 7 feet tall, you may want to consider either lifting your house or digging down the basement slab and footings.
There are two main choices when it comes to insulation for your basement renovation that don't suffer the same kind of moisture problems as fiberglass. One is expanded polystyrene (XPS) boards.