thinnest, lightest panel choice?

[nutrapuppy]

Is there a proven super light, strong alternate choice for panels? I am attempting to make a folding Hexyurt to haul in a Honda Fit. Any ideas?

Thanks,

Gibbon

[Alejandro Moreno]

Hexacomb is a possibility.  It's just not as easy to find as polyiso.  And I don't know that it has a foil outer layer.  I'm guessing it doesn't, which means it's not ideal in case it rains.  To be prepared for rain, you'd probably have to tape the outside with foil tape I imagine.

As per the Hexayurt Playa webpage (http://www.appropedia.org/Hexayurt_playa), hexacomb apparently also needs an additional insulating layer, as in and of itself, it seems to be insufficient for insulation purposes.

R+Heatshield is specifically mentioned to be used in conjunction with hexacomb.

Also mentioned are Coroplast or Triplewall corrugated cardboard. But again, I'm guessing they too will not withstand rain on their own. 

Personally, I think 1" polyiso is the way to go. I built an H13 with Rmax. Light, sufficiently strong, and great R factor to weight ratio, plus it already comes with an outer foil layer (which reflects sunlight away as well as resisting rain). 

-Alejandro

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[Gibbon]

Agreed, R+Heatshield is fantastic. If I used any other material I would coat it with Kilz and perhaps another layer of aluminum tape. Small, thin strong, light...i considered a used cardboard box reinforced with something or other. If I can get the roof rack going I should be set.

[Gibbon]

OK the H13 I had seen but never built. That is amazing. I am making it happen. Thanks!

[Vinay Gupta]

Look at 1/2" Thermax HD. Thermax HD is *the* material of the gods, it's vastly tougher than the other forms of polyiso, has better fire ratings, and is good in the outdoors if your hexayurts are going to be in the sun for a long time.

Special order, but this particular Unobtanium is worth the effort. One or two folks here built hexayurts from Thermax HD and can review, or google the archives.

V>

To view this discussion on the web visit https://groups.google.com/d/msg/hexayurt/-/NYRdz6G6D04J.

[Richard Ginn]

what about a hexa-tent made from R+Heatshield?   The site says it can span 8 feet unsupported.  A multi-layered skin (nested shells suspended one inside the other) would also be insulating with the dead air space between the shells.  Cut, tape, hang from a metal tube frame...

[Alejandro Moreno]

I just read a playa conditions report, and when I remembered this "thinnest, lightest" thread, it concerned me (pasted below):

"Posting this from a local list, which was a repost from another list.  Be prepared out there with your hexakites folks.  :)

-------------------------------------

Re: Playa Climate Prediction Center
Tue Aug 14, 2012 8:11 pm

Just had this relayed to me, comes from someone who's on-site at BRC...

'Over a 100 degrees everyday by 3pm. At 7-8pm for the last 3 nights we have had
60+ mph winds with dust whiteout. The playa is getting scrubbed by these high
winds. We lost 2 roof so far from the Temple camp kitchen/camp area. We are
running out of 40x50' tarps !!!!! Be prepared - all the town locals & old
burners say this is one of the highest wind years. We expect continued storms
for the next 2 nights. We had a 20' tall 50x50' structure demolished last night &
it was just substructure of 2x8" wood - ripped off the foundation. Not enough
cross bracing yet - uugh.'

WOOHOOO!!! batten down those hatches....."

-end-

On Wed, Aug 15, 2012 at 11:32 PM, Richard Ginn <richa...@gmail.com> wrote:

what about a hexa-tent made from R+Heatshield?   The site says it can span 8 feet unsupported.  A multi-layered skin (nested shells suspended one inside the other) would also be insulating with the dead air space between the shells.  Cut, tape, hang from a metal tube frame...

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