First of all, thanks to everyone for the great ideas and information Disclosure: I work for 3M, but I do not work with the tape products. I do have access to and use a great deal of my company's products and I believed that 3M had to have something that better addresses the requirements of a hexayurt. For Burning Man, anyway. Some of the 3M tapes hold aircraft skin panels in place, so there has to be something that works.
I searched through 3M's public website, finding aerospace products that were prohibitive. Oddly enough, on the hexayurt sites, someone referred to 3M 8067 tape for more durable hinges. Following up on that, I looked that product up, and contacted technical support. 8067 is a vapor and air barrier product, for window and door flashing. Incredible strength. 1700 lbs psi tensile ! (with 700% elongation). Fantastic adhesion to a variety of materials, including OSB. And it also adheres well in the presence of moisture (not our greatest obstacle, but I was impressed.). It survives 6 months outdoor exposure, according to the specifications. This is a construction tape and film system. It can also be applied at up to 120 degrees F. Helpful. ;-) Apparently, 8067 is the same stuff as 3015 and 8777, each for a different specific construction application. 8067 and 3015 have "3M" printed on them, but the 8777 does not. So you won't have to mask that one over at Burning Man. Here is the link to the 8067 spec. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&ved=0CHIQFjAC&url=http%3A%2F%2Fmultimedia.3m.com%2Fmws%2Fmediawebserver%3FmwsId%3D66666UF6EVsSyXTtoXMcLXf2EVtQEVs6EVs6EVs6E666666--%26fn%3DNO%25203M%2520Datablad%25208067.pdf&ei=Ol-uUZCcHbOi4AOFnYEI&usg=AFQjCNEb8hOgVIbMt_O4grVDqzF4xm5BYg&sig2=WXH3ieCqKvGM2YZbfy6StA&bvm=bv.47380653,d.dmg Peel strength of 66N per 100mm to OSB. It doesn't list aluminum, though it does list anodized aluminum. 66N there too. (After UV. Higher before.) Virtually all of the materials were similar (after UV) at 66N. Here is the tech sheet for the 3015. It has the tensile strength on it. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDcQFjAB&url=https%3A%2F%2Fpromo.3m.com%2Fassets%2F3MCAN%2F1805501114.pdf&ei=1l-uUaviApP94AOfxIGwBA&usg=AFQjCNFYonUkF9N7YFJH0zm9NNga-02dKw&sig2=SMLFw6-jEBrhNtnYD6wbxQ&bvm=bv.47244034,d.dmg You can search on any of these numbers with 3M tape in the search field as well. You will find documentation as well as websites that sell the products. Unfortunately, the stuff is not cheap. I can only find it on the web by the case, and it is about $26 for a roll of 4 inch tape and the roll is only 75 feet long. On the positive side, it is available with a split liner along its length, allowing you to bond one side carefully, then bond the opposite side making application easier. I have played with long lengths of tape before, and I would end up throwing wads of it away when it inadvertently stuck to itself. >:[ So I see the split liner as a huge advantage over no liner, or worse yet, a solid liner. My other thought is that with the incredible strength of the tape, that the 4 inch width will probably work. With the 8777, you would not have to tape over it again with foil tape or another tape simply to mask it. If you do want a more industrial bond, 12 inch film would be an option, though that stuff hits $100 a roll. But it will stick to damn near anything. Supposedly it is made in 6 inch width, but I couldn't find it. Pricing per square inch worked out to be uniform, where 24 rolls of 2 inch equaled 12 rolls of 4 inch, which equaled 4 rolls of 12 inch tape. About $380. All 75 feet long. I was fortunate enough to score 5 rolls of 8067 on clearance in the company store. Not enough for a full h12 or h13, but nearly. Over the long term, it might arguably be competitive. If you don't have to replace the tape for a few years, you only have to re-tape your separation joints, assuming a partially folded structure. In my garden, I use the 3M clear duct tape. It has a moderate level of UV tolerance. That might be an option to use over the inside hinges to seal the joints, as well as seal to the ground tarp. Non structural bonds. Then simply slice it when folding up. I have some that has been outside for 3 months now, stuck to EMT conduit, and it's holding up OK. I would be glad to answer any questions that I can, and you're welcome to check my shelter out at the Burn, in August. I'll be in the French Quarter BRC. -- You received this message because you are subscribed to the Google Groups "hexayurt" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hexayurt?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
