Insulating rough plank basement door

The outside door to our basement is basically just a bunch of 1x8"pine planks nailed together (like an old shed or barn door).
As you might imagine, the door let's a fair bit of cold air conduct through (I have already caulked the gaps). I would like to insulate the door, at least in the winter, until I redo the basement and put up a real door and frame.
I was thinking of maybe just tacking up some styrofoam like panels to either the inside or the outside of the door.
Any suggestions on recommended products and approaches?
Thanks
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I'd suggest that sealing is probably more important than insulating, especially because of "chimney-effect" of house. Sealing around door, to minimize infiltration. Lots of products available- you can judge what suits your situation best.
Leaks at different elevations have notable draft, like chimney. Leaks into basement and out via attic are especially bad for that.
HTH, J
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Ditto. Caulk the cracks and use *anything* which will seal off the door perimeter. Even if you simply staple plastic over the entire area - frame to frame - until you do your final improvement. That way the cost is reduced to nearly nothing and you still have reasonable access with minimal effort/ damage.
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That will work.
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Styrofoam insulation panels attached with adhesive will work fine. Contact The Dow Chemical Company at 1-866-583-2583 for a distributor nearest you.
Rich http://www.garagedoorsupply.com
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