Whats the best radiant barrier and foam insulation for walls, ceiling, and floor?

[magentawave]

<div>I have a few questions about radiant barriers and foam insulation please.&nbsp;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.<br><br>1) Does anyone know what the best radiant barrier is?&nbsp;Enerflex is the cheapest but much thinner than the others.&nbsp;All are at Home Depot.</div><div>&nbsp;</div><div style="padding-left: 30px;">- Enerflex 4' x 12' x 1/16" for $14: http://tinyurl.com/an2ntyf</div><div style="padding-left: 30px;">&nbsp;</div><div style="padding-left: 30px;">- Reflectix 4' x 25' x 5/16" for $42: http://tinyurl.com/d9u24mn</div><div style="padding-left: 30px;"><br>- UltraTouch 4' x 24' 3/8" for $60: http://tinyurl.com/aj9meq3</div><div><br><br>2) If I go with the much thicker UltraTouch that is 3/8", does that mean I could use thinner sheet foam insulation?<br><br>3) What kind of sheet foam insulation do you recommend? And would you use that same stuff on the floors too?</div><div>&nbsp;</div><div>&nbsp;</div><div>Thanks</div><div>&nbsp;</div><div>Steve</div>

 

[Willy]

&nbsp;With the Reflectix style insulation, there MUST be an air space between it and anything else for it to work properly. I believe that they claim at least 5/8", but I've gotten away with less. You could leave it 'bare', but that means crud can get on it (dust, cig smoke, cooking grease) and compromise some of the R-value. I stapled a radiant barrier to my ceiling and, using wooden spacers, put up a sub-ceiling made of white Coroplast. I was going to use Polystyrene foam w. the reflective film on one side, but they didn't have it in stock and the sub-ceiling would have been 3/4" lower.&nbsp;<br>&nbsp;<br>&nbsp;If you're going the foam route, might as well just layer the foam instead of mixing it with Reflectix. ..Willy.&nbsp;