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Fiberglass hi-top "R" value
Not sure if this belongs here or in the van section, but was wondering what the R-value for a fiberglass hightop would be? I'm sure it's not much, but has to be better than the metal roof, right?

I don't want to take away too much standup height by adding unneeded insulation.

2017 Chevy Express Extended w/ Quigley 4x4 conversion
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About the same as a bare sheet of cardboard.

At least doesn't actively transmit heat.

You still need insulation, on the floor too
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depends on the type of high top.
some are single wall fiberglass, not much R-value.
some are double wall with a cardboard honeycomb between the fiberglass, little better R-value.
some have a foam core sandwiched between the 2 walls of fiberglass these have good R-value.
if you want to insulate I would use 1/2 inch Ensolite foam glued to the inside then covered with hull liner. total thickness about 5/8's of an inch. if you think you need more insulation add more Ensolite. highdesertranger
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The following 2 users say Thank You to highdesertranger for this post:
climbing coastie (08-11-2017), slow2day (08-11-2017)

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