Heatable space within the unheatable sounds good. I think I'd avoid the
temptation to use expanded foam for my igloo, though. Flame can do some
nasty things quick. Shiny side in fiberglass in a wood frame with a face
of thin sheetrock or tempered board would do. Don't believe I'd worry about
wind intrusion, so the back could go au natural until a reason was found for
covering. Ceiling should have more than the walls, if you've got the
insulation.

Bet you could heat a 20x20 constructed that way for "pennies a day."

"Monroe" wrote in message
...
Interested in methods that others are using for working during winters
in metal quonsets that don't have permanent insulation. I'm toying
with the ideas of building a small, 8 ft high insulated "room" in one
corner of the quonset or perhaps erecting a temporary canvas/poly
enclosure (think temporary vehicle shelters with piping frame).

Winter here means periods of -40, dry. The quonset is all-metal,
corrugated, 40 ft x 60 ft x 20 ft max height with enclosed ends.
--

Monroe