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Join Date: Feb 2001
Location: Cumberland County 5A
Insulated the floor of the part of our camp that is on piers, with 2" styrofoam, back around 1981.
Cut pieces from 4x8 sheets, inserted them between the floor joists, tacked a few 16d nails into the joists about four feet apart, to keep the panels up against the subfloor. Still there, zero issues with any disturbance of the foam since.
If the joists are far enough above the ground to allow someone to crawl under there and put foam panels in, can't think of a quicker, less expensive way to insulate the floor of a cabin on piers? Even easier if you install the foam while building it, before putting the subfloor in place over the floor joists.
We didn't happen to think of it while building the original shanty. First deer season it was so cold with an un-insulated floor, our foam pads/sleeping bags froze to the plywood floor. The foam went in the following summer.
Some folks' learnin' curves just look like circles...3A Camp/also hunt 4B