Geof,
The polyisocynate foam board is the other foam I was thinking of (I think). I don't know if I have seen it in 1 1/2 thick sheets, seems like it is usually 3/4 in thick. Will have to ask next time I stop at the lumber yard.
I was also wondering if the steel framing would transfer the heat (or cold) very much. When framing with wood, there is a thermal break, but on the truck box, the framing will be steel tubing, with OSB or plywood fastened inside, then the finish paneling attached to that. Will that be enough of a thermal break? This is how Showhauler builds thiers as near as I can tell, so I suppose it must work.
Jeff in South Dakota
1995 Ford F-250 4X4 PSD
1992 Skamper Slide in camper
1984 Holiday Rambler 5er
1979 Mercedes Benz Unimog
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