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Old 10-08-2016, 07:33 PM   #1
Join Date: Aug 2016
Location: california
Posts: 27
Year: 1993
Coachwork: Thomas
Chassis: 3500 vandura
Engine: 6.5L GMC
Rated Cap: 16
Air gap and wall insulation?

So, I have been reading here and googling looking for info on where to leave an air gap in the insulation process. I have my sheet metal interior walls out from under the windows and ready for insulation. I have rigid foam for this. Does the air gap go between the outside metal wall and the foam or between the inside wall, which will be wood, and the foam. I have read opinions on both ways but was seeking opinions from seasoned skoolies on which way is best on a bus?

Many thanks
jennynic is offline   Reply With Quote
Old 10-08-2016, 08:56 PM   #2
Bus Nut
Join Date: Oct 2014
Location: Kent, WA (Seattle)
Posts: 343
Year: 1987
Engine: 6.9L Diesel

Anyone can say that "this is the best way" but without proof it's just some words. The general philosophy around here seems to be "try it out and report back with details". What I reccommend to you though is to use reflectix or some sort of radiant barrier around your airgap which will be between 1/8" to 3/4". Whether you put it outside your foam or inside is up to you, but I would do outside first, then maybe inside again if you're feeling it. The concept behind it seems to be something along the lines of the air gap acts with the radiant barrier to trap the temperature and protect it from outside. Or something like that, but I have no credibility to confirm this nor do I have a finished bus with any tested results.

Also, protip if you haven't already. Search Via googling " YOUR SEARCH INQUIRY" Also use google images it's a nice alternate way of looking.
TAOLIK is offline   Reply With Quote
Old 10-09-2016, 09:51 AM   #3
Join Date: Jul 2016
Posts: 50
Ideally an air gap both sides. But gap between metal and the foam will give less heat transfer to the insulation and improve the inside temp for the same insulation.
retiredChemist is offline   Reply With Quote

air space, insulation, wall

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