Insulation, Radiant and Vapor Barriers - best way to insulate cottage floor.

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mchristo
10-01-07, 09:46 PM
I have a cottage that sits on piers. (no basement). At the back of the house the crawl space is only about 6-8 inches and increases with the slope of the land to about 2.5 feet at the front of the cottage. The 'floor' below the floor joists is just sand/dirt. (very little room to work from the bottom. )
I was thinking of replacing the flooring with wood flooring and possibly even installing radiant floor heat but I'm worried that all the heat will still just go down and be lost under the cottage.
I was thinking of suspending some plywood on the bottom of the floor joists and filling with insulation, then covering with subfloor and flooring, but that seems like a lot of work to rip up and replace a perfectly good sub floor.
Is there a product that I could just install above the subfloor and then replace the flooring? and would it work with or without radiant floor heating?
Thanks for your ideas!

ps. the previous owners tried to do some insulating with fiberglass batts but the rodents made an absolute mess of it! so would have to be resistant to mice/squirells as there is no way to enclose the crawl space from the animals....thanks.