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Insulate for maximum space
#11
Reflectix is only useful on the cool side of an air gap or maybe against glass keeping radiant heat out. As a big awning casting shade from overhead would be ideal.

Air gaps take up space, better filled in a van with IMO foam.

It does nothing against conduction.

As a vapor barrier pushed against real insulation (reducing convection) might as well just use a strong plastic.
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travelinjoan (12-24-2017)
#12
The ole yahoo group "expert" used to recommend sandwiching polyiso with reflectix on both sides. I'd imagine most don't do that though.
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travelinjoan (12-16-2017)
#13
Well the side facing out to the sheet metal is doing something in summer, to the extent it's a dead air gap in between.

But reflecting low grade heat back into the living space, not effective.

And for the former scenario I'd prefer spray foam sealing up all the metal and spaces between and around the rigid panels so no air movement in any direction

Getting that whole envelope sealed up is very important, more so than going thick R-value but letting convection and conduction transfer energy around the panels.

Air gap + Reflectix is just not as effective a use of the precious interior space loss.

A tight vapour barrier is great, but no shiny needed for that.
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travelinjoan (12-24-2017)


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