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Old 03-19-2007, 01:09 PM   #11
Bus Nut
SeanF's Avatar
Join Date: Nov 2004
Location: Tucson, AZ
Posts: 524
Year: 1993
Coachwork: AmTran
Chassis: IHC
Engine: Dt360
Rated Cap: 19
One reason is to add a foil-faced layer of insulation with the foil facing the *outside*, just under the external steel bus skin.

We just had our hottest day so far -- 97 degrees outside in southernmost Arizona. The sun altitude was around 57 degrees @ solar noon....and our bus was only 2 degrees warmer than the outside air temp. Not bad for what is essentially a steel tube with no A/C or evaporative cooling.

There are other factors...white paint, east-west bus orientation, and having every door & window open for max air flow. Our two doors are on the north (shaded) side of the bus, so the coolest available air is moving through the bus.

Hope this helps
Bus conversion/info here
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Old 03-24-2007, 10:50 AM   #12
Bus Crazy
Elliot Naess's Avatar
Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 2,148
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
Is there something with a better R-value?
Try researching polyisocy... polyisocyan... oh heck... take a look here:
Millicent The Bus - roof raised two feet, toy-hauler tailgate.
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