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I have a few questions about radiant barriers and foam insulation please. I'll be adhering the radiant barrier to the bare fiberglass walls and ceiling of a Toyota Sunrader motorhome followed by some kind of sheet foam insulation. Cost matters so I'm looking for the best bang for the buck. 1) Does anyone know what the best radiant barrier is? Enerflex is the cheapest but much thinner than the others. All are at Home Depot. - Enerflex 4' x 12' x 1/16" for $14: http://tinyurl.com/an2ntyf - Reflectix 4' x 25' x 5/16" for $42: http://tinyurl.com/d9u24mn - UltraTouch 4' x 24' 3/8" for $60: http://tinyurl.com/aj9meq3 2) If I go with the much thicker UltraTouch that is 3/8", does that mean I could use thinner sheet foam insulation? 3) What kind of sheet foam insulation do you recommend? And would you use that same stuff on the floors too? Thanks Steve