Usually not recommended due to temp/humidity swings and the resulting
condensation. Even if it doesn't get wet to the touch, it can still soak
up moisture. Unless your well house/shop has stable humidity, the rock
will be prone to getting funky and soft after a year or three. The
exception would be arid climates, where nothing rots.
Like the other guy said, I'd recommend the stuff that they sell to line
pole barns with, even in preference to OSB, which likes to get fuzzy if
unfinished and damp, and sometimes has outgassing problems. Or even the
plastic-coated OSB they sell to skin cheap sheds with. Gotta look at the
long term, even if you have to put off the work awhile until you can
save up. No point in saving money now, if it costs you time and money to
rip it out and redo it in a few years.
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