Bill, last time I checked, Thermax HD had a proper fire rating for exposed use - i.e. Thermax HD naked to the air - while Tuff-R etc are only rated for use behind sheetrock.
It really does make a substantial difference to flame spread etc. The fire test standards for building materials are rigorous, and we ignore them at our peril. Vinay On Wed, Feb 10, 2010 at 2:46 AM, Bill Wiltschko <[email protected]> wrote: > I hate to disagree with the founder, but Thermax HD is not significantly > more fire-resistant than other foam panels. I researched the subject > before I bought my Thermax (non-HD) panels. The problem is, if the foil > is breached anywhere (edges, windows, rips and tears, holes for wires, > air, etc) the foam is vulnerable. And the foil WILL be breached. > Second, the foil isn't impregnable, as I learned when I used a heat gun > to remove the tape. If I remember correctly (please post corrections), > Thermax HD's fire rating is 25, while some foam panels are higher. The > standard is a wood panel at 100. Problem is, 25 isn't that good. > > Notice I said I bought the panels anyway. I've set my HY up at BM two > years. First, the HD version of Thermax isn't available anywhere. Two, > having worked in 911 dispatch for the last ten years, I haven't heard of > a tent fire, although I wouldn't be surprised if we've had some. Three, > Black Rock City has more fire people per capita than any city or town in > the US, with two or more large tankers and two or more smaller trucks on > duty 24/7. While it's true our HY's aren't bomb-proof, they're good > enough for the application and situation. > > YMMV > > Bill >> -------- Original Message -------- >> Subject: Re: [hexayurt] Re: Hexayurt/Pentayurt Hexacomb metal truss etc >> From: Vinay <[email protected]> >> Date: Tue, February 09, 2010 12:42 pm >> To: [email protected] >> >> >> Two words: THERMAX HD. >> >> Fire rated. >> >> Tough as nails. >> >> Basically the common polyiso material, but with a coke-can thickness >> of metal on both sides. >> >> Yes, I know Dow are not being helpful, but getting this material >> moving - $20 a sheet or something - is absolutely the way to put >> effort and energy if people want the best possible hexayurts this >> Burning Man. >> >> Vinay >> >> On Tue, Feb 9, 2010 at 7:37 PM, Brian <[email protected]> wrote: >> > On Feb 9, 1:54 pm, Chris Phoenix <[email protected]> wrote: >> >> Why are space blankets a no-no? >> > >> > Because they're made of mylar and mylar, being mainly a plastic, >> > burns. >> > The MSDS is here: >> > http://msds.dupont.com/msds/pdfs/EN/PEN_09004a2f8002e2ed.pdf >> > >> > While not exactly "ka-blooey" kind of burns, it is made of polyester >> > and will melt and sputter and make nasty gasses which you do not want >> > to be breathing in. >> > >> >> > 7. What about pentayurts? Seems more stable, no? >> > >> > From my models, the roofs are significantly more stable, but may need >> > to be secured to the ground in use if made from light materials. The >> > roof of a Pentayurt *may* need additional support to bear heavier snow >> > loads, but overall seems extremely solid. >> > >> > NB: This is all from a model 1/12 scale. I have not yet tried >> > building one full sized. Yet. >> > >> >> > basically I suggest we take all the recent discussions on materials, >> >> > supplies, designs, windows, air conditioners, guywires, etc, and work >> >> > on an updated faq. >> > >> > Excellent idea. >> > >> > I'd also like to propose some additions to the FAQ/Hexayurt site on >> > Appropedia: >> > 1. A Consolidated "instruction sheet" in PDF format which puts all the >> > info that is up there into a brief (1-3 pp) instruction sheet. >> > 2. A label for completed Hexayurts similar to >> > http://www.appropedia.org/File:HYPanel2pic.PNG >> > but incorporating a "No Flames" sign. >> > Basically, with 1 & 2, I'm thinking about a small, pictorial info >> > packet which can be sent with building materials to show people how to >> > build the structures they need and including a sign people can post on >> > the entrance of their yurt. >> > >> > Just a thought. >> > >> > >> > Brian >> > >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "hexayurt" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit this group at >> > http://groups.google.com/group/hexayurt?hl=en. >> > >> > >> >> >> >> -- >> Vinay Gupta >> Free Science and Engineering in the Global Public Interest >> >> http://guptaoption.com/map - social project connection map >> >> http://hexayurt.com - free/open next generation human sheltering >> http://hexayurt.com/plan - the whole systems, big picture vision >> >> http://bit.ly/flucode - please follow the Flu Code >> if you are in a flu-effected area. It protects us all. >> >> Gizmo Project VOIP : (USA) 775-743-1851 >> Skype/Gizmo/Gtalk/AIM: hexayurt >> Twitter: @hexayurt http://twitter.com/hexayurt >> UK Cell : +44 (0) 795 425 3533 / USA VOIP (+1) 775-743-1851 >> >> "If it doesn't fit, force it." >> >> -- >> You received this message because you are subscribed to the Google Groups >> "hexayurt" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/hexayurt?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/hexayurt?hl=en. > > -- Vinay Gupta Free Science and Engineering in the Global Public Interest http://guptaoption.com/map - social project connection map http://hexayurt.com - free/open next generation human sheltering http://hexayurt.com/plan - the whole systems, big picture vision http://bit.ly/flucode - please follow the Flu Code if you are in a flu-effected area. It protects us all. Gizmo Project VOIP : (USA) 775-743-1851 Skype/Gizmo/Gtalk/AIM: hexayurt Twitter: @hexayurt http://twitter.com/hexayurt UK Cell : +44 (0) 795 425 3533 / USA VOIP (+1) 775-743-1851 "If it doesn't fit, force it." -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hexayurt?hl=en.
